Answer:
occurs at a constant rate
Answer:
Option A, occurs at a constant rate
Explanation:
It becomes easy to determine the age of any radioactive substance when the rate of decay is constant and its starting and presents mass is known.
For example - if we know that the mass of a radioactive substance is 100 Kg few years back , but its present mass is 10 Kg. Then if we know the value of rate of decay, we can easily determine the age of substance based on the logarithmic equation as given below
[tex]A_t= A_0*e^{kt}[/tex]
Where [tex]A_t[/tex] is the mass of radioactive substance at time t
[tex]A_0[/tex] is the mass of radioactive substance at time [tex]t=0[/tex]
t is the time in years and
k is the decay constant.
Hence, option A is correct.
Eons are the broadest category of geologic time, and we live in the Phanerozoic eon. The Phanerozoic eon is further divided into eras. What divides the three eras of the Phanerozoic eon?
A. The appearance of carbon on Earth and the appearance of atmospheric oxygen separate the three eras from each other.
B. The development of insects and the development of flying insects separate the three eras from each other.
C. The first life on Earth and the first multicellular life on Earth separate the three eras from each other.
D. Mass extinction events separate the three eras from each other.
Answer:
D. Mass extinction events separate the three eras from each other
Explanation:
The Phanerozoic is an eon, thus it is representative of the largest unit of geological time. It is further divided into three eras. The three eras of the Phanerozoic are the Paleozoic, Mesozoic, and Cenozoic. These three eras have been divided on the basis of mass extinction events. The Paleozoic ends with the mass extinction at the end of the Permian period, which is also the largest mass extinction ever, and it also marks the beginning of the Mesozoic. The Mesozoic ends with the mass extinction at the end of the Cretaceous period, occurring because of a large meteorite or comet impact, marking the beginning of the Cenozoic era. The Cenozoic era is still going, and even though there have been extinction throughout it, none of them has been of a scale big enough to be considered as a mass extinction, so until something like that happens, this era will continue to exist.
How many molecules of ATP are produced from 1 molecule of glucose at the end of glycolysis? How many molecules were used to start the process? What is the net gain of ATP molecules from 1 molecule of glucose?
What must happen before meiosis can begin? A. Four gametes must be produced b. The four tetrads must be pulled apart c. Dna doubles and produces sister chromatids d. The cell membrane pinches together
Answer:
C
Explanation:
The DNA first needs to duplicate in stage Interphase-1.
Answer:C, dna doubles and produces sister chromatids
Explanation:
1.True or false? Gametogenesis is the same as meiosis?
2. Name two types of gametogenesis and how they are different from each other.
3 Why is it important that only one viable egg cell is produced during meiosis in females?
1. False. They are similar, though.
meiosis- A kind of cell division involving having the chromosome number. It is responsible for genetic recombination.
Gametogenesis- It's the process when gametes or germ cells are produced in an organism. They undergo meiosis to form gametes.
2. Spermatogenesis- happens in the testes of males. 4 gametes are produced. Spermatogenesis involves a metamorphosis stage called spermiogenesis. Spermatogenesis produces small, motile spermatozoa
Oogenesis- takes place in the ovary in a female. 1 gamete produced. in oogenesis there is no metamorphosis stage. In oogenesis the ovum is spherical, and isn't motile and is bigger with more food reserves and cytoplasm.
3. Because The one egg cell that results from meiosis contains most of the cytoplasm, nutrients, and organelles.
1. No, Gametogenesis is not same as meiosis.
What is gametogenesis?The creation of gametes from haploid progenitor cells is known as gametogenesis.
What is meiosis?Meiosis is a kind of cell division that results in a reduction in the number of chromosomes in gametes (the sex cells, or egg and sperm).
2. Gametogenesis are classified into two types. They are
Spermatogenesisoogenesis.What is Spermatogenesis?Spermatogenesis is the scientific name for the production of sperm cells.
To create spermatozoa, rounded immature sperm cells go through many mitotic and meiotic divisions (spermatocytogenesis), a metamorphic change (spermiogenesis), and a metastatic transformation.
What is oogenesis?The process of developing mature female gametes from primordial germ cells is known as oogenesis.
3. Meiosis produces one egg, which has the greatest nutrition, cytoplasm, and organelles. One huge cell and one cell with more DNA result from the uneven distribution of chemicals (polar body which gradually degenerates).
What is cytoplasm?The gelatinous liquid that makes up a cell's interior is called cytoplasm.
What is organelles?Inside cells, organelles are specialized structures that carry out a variety of tasks.
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The use and application of living things and biological processes is known as
a. human biology.
b. medical research.
c. biotechnology.
d. epidemiology.
Answer:
THE ANSWER IS C. BIOTECHNOLOGY
Explanation:
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What percentage of someone’s genetic background may contribute to alcohol dependency?
Answer:
The percentage of an individual genetic background that may contribute to alcohol dependency is 50%.
Explanation:
Alcohol dependency refers to a chronic disease in which the affected individual has an uncontrollable urge for alcoholic drinks. There are many factors that can cause one to depend on alcohol and one's genetic background is one of them.
Recently, researchers have been able to identify a specific gene that is responsible for development of alcoholic dependency. Before now, scientific studies have been able to proof that children born by alcoholic parents have high tendency of becoming alcoholic adults. The percentage of genetic heritage that is responsible for alcoholic use is as high as 50%
DNA replication allows the basic units of heredity found on segments of DNA, called ___ , to be passed on from parent to offspring.
Answer:
Genes
Explanation:
Genes code for proteins that leads to certain traits to be expressed, leading to phenotype to be seen based on different genotypes expressed.
Answer:
The answer is genes on edg 2020
Explanation:
When a continental tropical air mass influences the United States, what kinds of weather does it bring with it? hot, wet conditions hot, dry conditions cold, dry conditions cold, wet conditions
Answer:
hot, dry conditions
Explanation:
The continental tropical air masses are air masses that form over regions with tropical climate. They form over land, not over water. Because they form over land where the temperatures are high, these air masses are hot and dry. When they move toward the United States, or any other place in the world that is influenced by these air masses, they bring in a sudden change in the weather conditions, bringing in very hot and dry weather. This can be very bad for the health of the people, especially for the ones that have chronic diseases, and it also is very dangerous for the agriculture because these air masses tend to dry the soil and suck out all of its moisture.
How does high biodiversity allect an ecosystem?
O
A. It makes the ecosystem able to survive disturbances,
O
B. It allows more introduced species to become invasive,
O
C, prevents disturbances in the ecosystern,
O
D. It makes species more likely to go extinct.
Answer:
A
Explanation:
It makes the ecosystem more stable
What organ is the first to receive nutrients that have been absorbed from the digestive tract?
Which best describes how the common cold spreads in the human body? A Bacteria burst out of normal cells killing them B viruses replicate inside respiratory cells C bacteria inject dna into normal cells D viruses insert dna into bacteria
Final answer:
The common cold spreads in the human body as viruses, particularly rhinoviruses, replicate inside respiratory cells, potentially causing cell damage or death, and triggering an immune response leading to symptoms.
Explanation:
The common cold is primarily caused by rhinoviruses, which are a type of virus, not bacteria. These viruses replicate inside the respiratory cells of the human body. The process involves the virus attaching to the cell, penetrating it, and then using the cell's machinery to replicate its own genetic material and produce new virus particles. As a result, the host cell may experience significant biochemical and structural changes, which can lead to cell damage or death through lysis or apoptosis. Once the new viruses are produced, they are released from the cell and can go on to infect adjacent cells, continuing the cycle of replication. The symptoms observed during a cold are a combination of the immune response trying to eliminate the virus and the damage caused by the virus itself.
we all have different forms of genes from our parent(s).what are these different forms called?
A.alleles
B.characters
C.DNA
D.resources
Answer:
the answer is allele
Allele. Genes come in more than one form. The different forms are called alleles.
Once an egg has been fertilized: multiple choice
a zygote is formed
a barrier to other sperm forms immediately
new genes are formed
cytoplasm is always exchanged
the zygote becomes haploid
a mature egg is fertilized when it is joined with a sperm cell
the answer is B
What percentage does each square in a punnett square represent?
A.25%
B.33%
C.50%
A punnet square is made up of 4 smaller squares.
These all add up to 100%, so each smaller square represents 25%
Answer:
B) 25%
25%
A Punnett square is a four by four diagram used to predict an outcome of a particular cross or breeding experiment.
Because it is four by four, we can deduct that each square is equivalent to 25% since 1/4 = 0.25 or 25%
Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. Select one location to collect water samples in the pond. Collect a 5-mL water sample at 8 am for two days. Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not reliable?
1)The pesticide measurements were the dependent variable.
2)The samples were collected at different times.
3)The samples were only collected for two days.
4)The time of sample collection was not an independent variable.
In a scientific inquiry, we often seek to investigate the impact of one variable on another. These variables in the study are known as dependent and independent variables.
In experimental research, the independent variable also known as(cause) is unaffected by other factors in your research.
The dependent variable is affected depending on the changes occurred in the independent variable, as such they are dependant on the independent variable.
In experimental research, the person carrying out the experiment manipulates or changes the independent variable to see what influence it has on the dependent variable.
From the given question, the experimenter wants to test and deduce whether the pesticides kill the fish in the farm pond.
Dependent variable = pesticides
However, the reason why they failed to get a reliable result in their conclusion is that they attribute the dependent variable which is the fish kill to the pesticides.
So, the true variables should be:
The independent variable ⇒ is the pesticideThe Dependent variable ⇒ is the death of the fishTherefore, we can conclude that the best statement that describes why their conclusion is not reliable is in Option (1).
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The students' conclusion that pesticide runoff is not causing fish kills is not reliable because they only collected data for two days, which is insufficient to account for variable factors and lacks a control group.
Explanation:Two students concluded that pesticide runoff from local farms is not causing fish to die in the pond based on their experiment. However, given the information provided, the reliability of their conclusion is questionable. The statement that best describes why their conclusion is not reliable is 3) The samples were only collected for two days. This is a significant limitation because a longer period of observation would provide a more accurate picture of the regular levels of pesticides and their fluctuations. Variables like weather events, farming practices, and seasonal changes can all impact pesticide runoff, and two days of data are insufficient to account for these variables.
Additionally, to ensure the data's reliability, the experiment should have included a control group and possibly sampled multiple locations at different times to account for variation. Without these, it is difficult to ascertain whether the detected levels of pesticides are abnormal or if other factors could be responsible for the fish kills.
Mitosis in plant cells differs from mitosis in animals cells in that plant cells do not have __________, and ___________ involves the formation of a cell plate.
A. centrioles; cytokinesis
B. spindle fibers; cytokinesis
C. anaphase; metaphase
D. centromeres; metaphase
The correct answer to the student's question is A. centrioles; cytokinesis, as plant cells do not have centrioles and cytokinesis in plant cells involves the formation of a cell plate.
Mitosis in plant cells differs from mitosis in animals cells in that plant cells do not have centrioles, and cytokinesis involves the formation of a cell plate. Hence, the correct answer is A. centrioles; cytokinesis.
In animal cells, microtubule-organizing centers called centrioles replicate and assist in the formation of spindle fibers during mitosis. In contrast, plant cells lack centrioles but have a structure known as the MicroTubule Organizing Center (MTOC) that functions similarly during mitosis. During cytokinesis in plant cells, a cell plate is formed by the fusion of vesicles derived from the Golgi apparatus, which eventually develops into a new cell wall separating the two daughter cells. In animal cells, cytokinesis occurs when an actin ring constricts to form a cleavage furrow, which pinches the cell into two separate entities.
What was the first human organ to be successfully transplanted?
Answer:
the first human organ to be successfully transplanted was a kidney.
Explanation:
Which of the following would you need in order to compare the effect of two different fertilizers on plant growth?
a. a way to measure plant growth
b. a variety of plant species
c. a selection of soil types
d. a cardboard box to cover one plant
Answer:
a way to measure plant growth
a group of students is asking people to determine whether they use plastic bags
What is the function of the gametophyte generation of the fern plant? Not multiple choice.
produces reproductive organs which produce a zygote
produces meiospores which grow into a sporophyte plant
produces a new fern asexually
grows as a diploid fern
The function of the gametophyte generation of the fern plant is it produces reproductive organs which produce a zygote.
What is the function of the gametophyte generation of the fern plant? Fern gametophyte is a gametophytic phase in Fern plants that are associated with gamete formation.Ferns exhibit alternations in generations of their life cycle and possess diploid sporophytic and haploid gametophytic stages.It produces reproductive organs which produce a zygote.Zygotes grow into the sporophyte(diploid), and spores grow into the gametophyte(haploid). The sporophyte produces haploid spores through meiosis, gametophyte produces gametes through mitosis.A major function of the gametophyte generation is to produce haploid gametes. The fusion of the egg cell with the sperm cell gives rise to the sporophyte, thereby completing the life cycle. In many lower plants, gametophytes are the dominant and free-living generation.So, the function of the gametophyte generation of the fern plant is it produces reproductive organs which produce a zygote.
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If one strand of dna contains the bases acagt, what would be the complementary bases on the mrna strand?
A viral genome is studied. It is composed of 33% Adenine, 28% Thymine, 22% Cytosine and 17% Guanine. Predict whether this genome is single or double stranded and whether it is DNA or RNA based.
A) The genome is DNA based and single stranded.
B) The genome is DNA based and double stranded.
C) The genome is RNA based and single stranded.
D) The genome is RNA based and double stranded.
Answer:
A) The genome is DNA based and single stranded.
Explanation:
The reason why it is DNA based is because DNA contains thymine base (T). It is not RNA based because RNA contains uracil base (U) instead of thymine and in the given question there is not uracil mentioned.
It is single stranded because according to Chargaff's rule a double stranded nucleic acid must have the ratio of purine bases to pyrimidine ratio as 1:1.
Adenine (A) & Guanine (G) are purine bases while Thymine (T) & Cytosine (C) are pyrimidine bases so according to Chargaff's rule AG/CT = ~ 1. It means [A+G] = [C+T]
Also, A makes interaction with T while C makes interaction G. It means,
[A] = [T]
[C] = [G]
By this we can easily infer that a double stranded DNA will have as much A as much it has T & same goes with C & G.
But, in the given question, A = 33% while Thymine = 28% which are not equal so this means that this molecule is single stranded.
2. Which is not an example of condensation nuclei?
A smoke
B salt particles
C water droplets
Water droplets are not an example of condensation nuclei; they are the products created due to the presence of nuclei such as smoke or salt particles.
Explanation:In the process of condensation, the gas phase of a substance changes into its liquid phase. Condensation nuclei act as a 'meeting point' where water vapor in the air can accumulate and condense to form water droplets. These nuclei can be various particles, such as smoke, salt, dust, and more, suspended in the atmosphere. Hence, options A (smoke) and B (salt particles) in the question can act as condensation nuclei. On the other hand, option C (water droplets) is not an example of condensation nuclei; instead, they are the products formed due to the presence of these nuclei.
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Condensation nuclei are small particles in the atmosphere around which water vapor condenses to form cloud droplets. Both smoke and salt particles can act as condensation nuclei. However, water droplets are not condensation nuclei, but the result of the condensation process.
Explanation:In the context of atmospheric science, condensation nuclei are small particles in the atmosphere around which water vapor condenses to form cloud droplets. These nuclei can be composed of a variety of materials such as dust, smoke, and salt particles.
Option A (smoke) and B (salt particles) can be examples of condensation nuclei as both can serve as surfaces for water vapor to condense. However, option C (water droplets) are not an example of condensation nuclei. Instead, they are the result of the condensation process that occurs around the nuclei.
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Which area pictured below represents the largest reservoir of water on Earth?
A. Area 1 ( I think that its this answer, but I want to make sure its correct)
B. Area 2
C Area 3
D. Area 4
Answer:
C Area 3
Explanation:
The largest reservoir of water on our planet is the ocean and not the clouds.
Water is the most abundant substance on our planet and it is estimated that the vast majority of all water on earth is stored in the ocean, it is no wonder that planet Earth has 70% of its surface covered with water and the most of that water makes up the oceans.
The second largest reservoir of water is glaciers, followed by groundwater and clouds.
Although there is no provided diagram, usually the largest reservoir of water on Earth is the world's oceans, which hold more than 96% of all Earth's water. The correct answer would be the area representing the world's oceans on your diagram.
Explanation:Based on the nature of the question, it appears to be referring to the distribution of water on Earth. Without the specific visuals, it's challenging to provide a definite area; however, it's crucial to know that the largest reservoir of water on Earth is the world's oceans. The oceans account for over 96% of all Earth's water. Whether labeled as Area 1, 2, 3, or 4 in your diagram, the correct answer would be the area representing the oceans. Continue studying Earth's hydrosphere for a better understanding of water distribution on Earth.
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The ultimate purpose of respiration:
A. inhale 02 and exhale CO2
B. place oxygen in the lungs
C. place oxygen in the blood
D. deliver oxygen to every blood cell
Answer:
D. deliver oxygen to every blood cell
Explanation:
Respiration is the process by which organisms liberate energy from food by chemical processes. It is more appropriately called cellular respiration as the process occurs in the cell.
During respiration, energy is released from food when oxygen combines with food materials. The waste product is carbondioxide in most cases.
The ultimate purpose of respiration(breathing) is to furnish the body system with oxygen at cellular level for the release of energy.
The process by which volcanoes vent water vapor, carbon dioxide, nitrogen, and other substances is called ____.
Question 17 options:
oxidation
glaciation
differentiation
outgassing
Answer:
The process by which volcanoes vent water vapor, carbon dioxide, nitrogen, and other substances is called outgassing.
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How do gases increase the overall greenhouse effect? A. Trapping energy from the sun in the earth's atmosphere B. Increasing the overall width of the ozone C. Increasing the size of the stratosphere and decreasing the size of the mesosphere
Answer:
A. Trapping energy from the sun in the earth's atmosphere
Explanation:
The gases, or rather the greenhouse gases, are gases that have the ability to trap the heat into the earth's atmosphere. When there's enough of these gases in the atmosphere, the heat that is reflected from the earth's surface and heads back toward the space is trapped in big portion by them. As the heat is trapped and accumulated, the atmosphere become warmer, thus the global climate changes gradually and it becomes warmer. The gases that have the biggest influence in this process are the carbon dioxide and the methane.
Taq polymerase is an enzyme isolated from the organism Thermophilus aquaticus. This organism has been found living in the hot springs of Yellowstone National Park. This enzyme is used to copy human DNA from crime scenes. Most reactions are performed at ranges similar to those of the human body; however, what considerations should be made for optimum use of this enzyme?View Available Hint(s)Taq polymerase is an enzyme isolated from the organism Thermophilus aquaticus. This organism has been found living in the hot springs of Yellowstone National Park. This enzyme is used to copy human DNA from crime scenes. Most reactions are performed at ranges similar to those of the human body; however, what considerations should be made for optimum use of this enzyme?The enzyme will not work on human DNA.Nothing should be altered.The pH should be decreased.The temperature should be raised.
Answer:
The correct option is this: THE TEMPERATURE SHOULD BE RAISED.
Explanation:
The enzyme that is used in Polymerase Chain Reaction (PCR) to copy DNA materials from crime scenes is Taq polymerase. This synthetic enzyme is derived from Thermophilus aquaticus, which is a thermophile bacteria that can tolerate very high temperature. Because of this characteristic, the enzyme derived from this bacteria can not be used in the laboratory at room temperature for the purpose of copying DNA. The temperature has to be raised to a very high level, because the enzyme can only be active at very high temperature.
To obtain optimum use of Taq polymerase, the temperature needs to be raised because it is a heat-stable enzyme. Most reactions are performed at ranges similar to those of the human body, but the enzyme requires higher temperatures to work effectively.
Explanation:Taq polymerase is an enzyme isolated from the organism Thermophilus aquaticus, which lives in the hot springs of Yellowstone National Park. This enzyme is used to copy human DNA from crime scenes. To obtain optimum use of this enzyme, the main consideration is to raise the temperature because Taq polymerase is a heat-stable enzyme. Most reactions are performed at ranges similar to those of the human body, but for Taq polymerase to work efficiently, the temperature needs to be increased to the optimal range.
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An example of natural selection is the red color of a male cardinal. The females of the species choose mates based on the vibrant colors of the males' feathers. If females begin using different criteria than feather color when they choose mates, what would most likely happen to the color of the male cardinals over time? increased variation in the shades of red because the selection pressure has been relieved increased variation in the shades of red because the cardinals try different ways to impress the females decreased variation in the shades of red because no form of the trait is advantageous decreased variation in the shades of red because the only reason for variation was selection pressure
Answer:
decreased variation in the shades of red because no form of the trait is advantageous
Explanation:
The last option also seems correct, but selections is somehow aleatory. You cannot consider "reason" as a factor.
Answer:
The correcta answer is opcion B). "decreased variation in the shades of red because no form of the trait is advantageous".
Explanation:
If females choose males for other traits than the red color of feathers, it is probably that the feathers would decrease the variation in the shades of red because no form of the trait is advantageous.
On the one hand, females do not choose males for this characteristic anymore, which means that this color is not advantaging for mating. On the competition with other males, they will have to develop the other trait that makes them look better genetically.
On the other hand, these bright colors make males very visible to predators, a pressure that will make the turn to less bright visible colors for better hiding and fewer chances to get caught.
What is the correct equation for cellular respiration?
a. 6CO2 + 6H2O + Energy ----------> 6O2 + C6H12O6
b. 6CO2 + 6H2O ----------> 6O2 + C6H12O6 + Energy
c. 6O2 + C6H12O6 --------> 6CO2 + 6H2O + Energy
d. 6O2 + C6H12O6 + Energy -------------> 6CO2 + 6H2O
The correct equation for Cellular respiration is:
6O2 + C6H12O6 --------> 6CO2 + 6H2O + Energy
Cellular respiration occurs in humans and animals. It is the process whereby, humans breathe in oxygen and breathe out carbon dioxide.During the process of cellular respiration, when oxygen is breathed in, it interacts, combines, and reacts with glucose and this results in the formation of carbon dioxide, water, and energy.
The equation for cellular respiration is given as :
6O2 + C6H12O6 --------> 6CO2 + 6H2O + Energy
Therefore, the correct option is option c.
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The correct equation for cellular respiration is 6O2 + C6H12O6 + Energy -------------> 6CO2 + 6H2O.
Explanation:The correct equation for cellular respiration is option d. 6O2 + C6H12O6 + Energy -------------> 6CO2 + 6H2O.
During cellular respiration, glucose (C6H12O6) is broken down in the presence of oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy in the form of ATP.
This process occurs in the mitochondria of cells and is essential for the production of energy needed for various cellular activities.
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