a light microscope image is formed by
In 1939, the use of DDT (a powerful synthetic chemical) as an insecticide was discovered. The United States adopted its widespread use, producing up to 100 million kilograms per year (200 million pounds per year). Twenty years later, severe side effects started to be reported as a result of DDT use. Which was an advantage of using DDT?
insect and pest populations decreased
birth defect rates increased
cancer rates increased
fertility rates decreased
Answer:
A. insect and pest populations decreased
Explanation:
What would be the most likely outcome if the ribosomes of a cell were damaged and stopped functioning?
Answer
Cell growth and repair would slow or stop.
Cell waste would no longer be processed.
The cell would produce more mitochondria.
The cell would lose structure and shape.
what is the type of subunits that form amylase
Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. Over the past 50 years, the amount of tropical rainforest acreage found throughout the world has decreased from 14.8 billion acres to 8.6 billion acres due to deforestation. What factor is likely most responsible for the changes observed in the world’s rainforests?
Human activity is probably most responsible for the modifications witnessed in the world's rainforests.
The humans thrive in the rainforests and affect it extremely. The activities like logging have resulted in the loss of almost 137 animal and plant species each day due to deforestation. The activities of humans like the production of toxic by-products, oil spills, and mining incidents, and the continuous dumping of wastes are endangering the rainforests and the species living in there.
The humans also practice the slash and burn agriculture that then results in infertility of the soils and makes vegetation to stop growing. The lack of plants eventually results in an increase of carbon dioxide in the atmosphere, thus, causing global warming.
To which substance does ferredoxin transfer an electron?
Which of these is a significant effect of vascular plants? They were the first plants to colonize land. They gave rise to mosses. They help maintain ecological balance by preventing desertification.
Answer: They maintain ecological balance by preventing desertification.
Explanation:
Vascular plants are plants that have conducting tissues, phloem and xylem. These tissues are responsible for transporting water and nutrients from the soil to the ground.
Xylem is responsible for transporting water and phloem is responsible for transporting nutrients from the soil to the plants. They have leaves, stems and roots.
Vascular plants produce seeds and fruits. Because of the fruits they produced, they can be grown or can multiplied by sowing their seeds therefore enhancing their multiplications and preventing desertification. They maintain ecological balance by reproducing by seeds and multiplying.
Examples are angiosperms.
A prokaryotic cell does NOT have
A.
Cell membrane
B.
Cytoplasm
C.
Nuclear membrane
D.
Ribosomes
Answer:
It's the third answer.
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What is the role of the DNA polymerase in DNA replication?
A. It ties the chunks of DNA together.
B. It checks the DNA for errors.
C. It creates the replication fork.
D. It breaks apart the bases
Which type of animal has a lateral line system to detect vibrations in water?
amphibians
fish
whales
birds
Fish have a lateral line system which gives them the ability to detect small vibrations or currents.
Which of the following is not included in a typical age structure diagram A. The population sex ratio B. The relative numbers of people in different age groups C. The populations historical growth D. The proportions of reproductive age individuals
The following not included in a typical age structure diagram is C. The populations historical growth
Explanation:A typical age structure diagram provides information about the distribution of a population across different age groups, which helps in understanding population dynamics and predicting population growth. The diagram includes the population sex ratio, which shows the proportion of males to females in each age group.
It also includes the relative numbers of people in different age groups, which is represented by the shape of the diagram (pyramidal, conical, etc.). Additionally, the age structure diagram provides information about the proportions of reproductive age individuals, as this is crucial for understanding fertility rates and population growth potential.
However, the population's historical growth is not included in a typical age structure diagram. Age structure diagrams do not provide information about the past growth rates or precise historical population size. They focus on the current distribution of the population across different age groups and provide insights into the potential future growth based on the age composition of the population. The correct answer is C. The populations historical growth
Japanese scientist Eiichi Kurosowa discovered a fungus that caused abnormal growth in rice varieties. What was the reason for this abnormal growth?
secretion of the homone abscisic acid by the fungus Fusarium oxysporum
secretion of hormone gibberellic acid by the fungus Gibberella fujikuroi
secretion of the hormone abscisic acid by the fungus Pythium sps
Answer:The correct answer is secretion of hormone gibberellic acid by the fungus Gibberella fujikuroi
Explanation:
It was done in the 1920s and it was because of this experiment that the hormone Gibberellin was discovered which is used in plant elongation and cell growth, as well as dominancy and similar things.
The f2 generation phenotypes resulting from the mono hybrid cross of pure reds display a ratio of
physical limiting factors of an ecosystem are such things as?
In which phase(s) of cellular respiration is water made
Water is made in the electron transport chain, which is the third and final phase of cellular respiration.
What is cellular respiration?Living organisms undergo respiration, which involves a sequence of chemical reactions occurring within their cells. This crucial process converts glucose and other nutrients into energy.
Within the membrane of the mitochondria there exists a chain of proteins known as the electron transport chain. This chain facilitates the transfer of electrons, from NADH and FADH2 to oxygen resulting in the release of energy.
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what is the important outcome of meiosis 2
The key outcome of meiosis II is the production of four unique haploid cells, which are important for genetic diversity in sexual reproduction.
Explanation:The important outcome of meiosis II is the separation of sister chromatids into individual chromosomes, resulting in the formation of four genetically unique haploid cells. During meiosis II, two haploid cells produced from meiosis I undergo cell division without chromosome replication in interkinesis. The division in meiosis II follows steps similar to mitosis but it's critical in ensuring genetic diversity through the creation of unique gametes for sexual reproduction.
The diagram shows that currently about 100 gigatons/year of carbon are moved from the atmosphere to vegetation on land. Which process could decrease this number?
ncdc.noaa.gov
reducing the amount of urban area in the world
cutting down large areas of forests
warming up the oceans
increasing respiration rates
the answer is b cutting down large areas of forest
1. What can muscle cells do that other cells cannot?
2. Why are skeletal and cardiac muscles striated?
Muscle cells can contract, a function unique to them, with skeletal muscles enabling bone movement and cardiac muscles pumping blood. Striations in skeletal and cardiac muscles arise from the alignment of sarcomeres, giving them a banded appearance. Smooth muscles, in contrast, are not striated and are located in the GI tract, among other organs.
Explanation:Differences Between Types of Muscle Tissue
Muscle cells are specialized to contract and produce movement, a function not found in other cells. Muscle cells, specifically skeletal muscles, are responsible for moving bones, while cardiac muscles contract to pump blood within the heart. Unlike cardiac and skeletal muscle, smooth muscle cells, which are found in the gastrointestinal tract among other locations, are not striated due to their arrangement in sheets rather than bundles.
Striated muscles, such as skeletal and cardiac muscles, are characterized by their banded appearance, which is due to the sarcomere structure within the muscle fibers. While both types of striated muscles contain sarcomeres, which are the functional units of muscle contractions, their arrangement is slightly different in each, contributing to their unique appearances and functions.
The function of the skeletal muscle is to permit voluntary movement, as exemplified by the action of the biceps muscle when lifting an object. In contrast, cardiac muscle function is involuntary and specifically adapted to pump blood through the heart chambers and throughout the body.
Why are antibiotics unhelpful for treating the common cold?
A. Colds are caused by antibiotics.
B. Colds are caused by bacteria.
C. Antibiotics cannot treat illnesses.
D. Viruses are not killed by antibiotics.
Viruses cannot be killed by antibiotics. APEX
This pedigree chart tracks the inheritance of a recessive trait that is not sex-linked. Based on the information in the chart, which of the following statements is true about individuals 3 and 4?
At least one is heterozygous for the trait.
They are both homozygous dominant for the trait.
They are both heterozygous for the trait.
At least one is homozygous for the trait.
They are both heterozygous for the trait.
They both express the dominant trait, but one of the offspring is recessive. The only option for this is that both are heterozygous and have two genes: recessive and dominant.
You can see this when you draw a Punnett square.
Subject 3 will be Dd where D is the dominant trait, and d is the recessive trait. Subject 4 will be Dd.
Now cross them, and you'll found 25% chances of having a recessive offspring.
You can't have only one of them heterozygous because, when you draw the Punnett square, you'll have 50% dominant and 50% dominant heterozygous.
The same happened with only one homozygous.
And, if they were both homozygous dominant you only have one trail, no two, and again you can't have a recessive offspring.
Which best describes reproduction?
Asexual reproduction may lead to an accumulation of mutations in the DNA.
Sexual reproduction allows for diploid gametes to combine to increase genetic variation.
Asexual reproduction leads to the formation of haploid gametes.
Sexual reproduction allows for more gametes to be formed than asexual reproduction does.
Through the process of differentiation bone cells are formed and they cannot return to stem cells. Why then can a broken bone heal?
A) The process of mitosis allows the old bone cells to divide and produce new bone cells.
B) The process of meiosis allows for the reproduction of bone cells
C) The process of differentiation occurs again and produces new bone cells.
D) The process of reproduction happens and produces new bone cells.
Answer:
Option (A).
Explanation:
Mitosis can be defined as a type of cell division that produces two identical daughter cells from a single parent cell. Mitosis is responsible for growth and repairing of old or damaged cells.
When bone breaks, mitosis occurs in pre-existing bone cells, which leads to formation of new bone cells to heal broken bone.
Thus, the correct answer is option (A).
If a mother carries a recessive allele for a genetic disorder, such as cystic fibrosis, under what circumstances will her children inherit the disorder?
A. The children must be female like the mother to inherit the disorder.
B. The paternal grandfather must also carry the recessive allele.
C. The children's father must also carry the recessive allele.
D. The mother's father must also carry the recessive allele.
I think the answer is A, is that correct?? ...?
Children will inherit an autosomal recessive disorder like cystic fibrosis if both parents carry the recessive allele. The father must also be a carrier for the children to potentially inherit the disorder.
If a mother carries a recessive allele for a genetic disorder, such as cystic fibrosis, the circumstances under which her children will inherit the disorder is if the children's father must also carry the recessive allele. The correct answer to the question is C. This is because cystic fibrosis is an autosomal recessive condition, meaning that it occurs on one of the non-sex chromosomes and an individual must inherit two copies of the defective allele, one from each parent, to express the disorder. The gender of the child does not affect inheritance of autosomal recessive disorders; thus, male and female offspring have the same likelihood of inheriting the disease.
Furthermore, having a paternal grandfather or a mother's father who also carries the allele does not affect the child's chances of inheriting the condition unless the father himself is a carrier. This can be determined using a Punnett square, which can predict the probability of offspring inheriting the disorder based on parental genotypes.
What events caused the formation of most islands in the South Pacific?
Answer:
Volcanos
Explanation:
Sorry if I'm wrong
Enzymes can be denatured (unfolded) by what environmental factors?
Enzymes can be denatured unfolded by the environmental factors including heat or chemicals.
What are enzymes?Enzymes are proteins found in living organisms that can speed up chemical reactions while remaining unchanged at the end of the reaction.
Heat and chemicals are two factors that can denature enzymes. This is due to:
Higher temperatures distort the shape of the active site, reducing or eliminating its activity. Denatured enzymes are those that have lost their shape.These environmental factors can cause the enzyme's pH to change.As a result, for an enzyme to function properly, the external factors that influence its activities must be normal and favorable.
Thus, heat and chemicals are some factors that can denature enzyme.
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Arteries carry oxygen-rich blood to capillaries. True or False? Arteries carry oxygen-rich blood to capillaries. - is true. ***The arteries deliver the oxygen-rich blood to the capillaries where the actual exchange of oxygen and carbon dioxide occurs. [ The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. ]
The given statement is true.
The arteries are the blood vessels, which carry the oxygenated blood away from the heart. The arteries carry the oxygenated blood to the capillaries. the capillaries are highly branched thin walled blood vessels.
In the capillaries, the actual exchange of the gases between the blood and the body tissues takes place through the diffusion process. In the process of gaseous exchange, the capillaries become rich in carbon dioxide and other wastes, which they pass down to the veins and the veins carry the blood to heart.
Arteries carry oxygenated blood is a true statement.
Further Explanation:
Heart is a major central organ of the circulatory system. This helps the organism to use up the oxygen taken by the process of respiration by channeling to different organs. This process is undertaken by the help of blood vessels. Heart pumps the blood to different organs by means of blood vessels. Arteries are a type of blood vessel. The blood vessel is generally divided into three types;
a. Arteries
b. Veins
c. Capillaries
They vary in shape, size, structure and function. The blood vessel which is generally responsible to carry blood away from the heart to the body organs is artery. Artery carry oxygenated blood. This blood reaches the capillaries and the process of diffusion occurs. Diffusion is the process that brings about the gaseous exchange in the body. The waste material and other not required components are filtered and is excreted out of the body.
Thus, artery carry oxygenated blood away from the heart.
Learn more:
1. Learn more about proteins https://brainly.com/question/1420458
2. Learn more about DNA https://brainly.com/question/2416343
3. Learn more about replication https://brainly.com/question/1600165
Answer Details:
Grade: High School
Subject: Biology
Topic: Human physiology
Keywords:
Heart, artery, veins, capillaries, oxygenated blood, deoxygenated blood, blood, gaseous exchange, excretion, pumping.
where are the proteins of the electron transport chain located
The proteins of the electron transport chain are located in the inner mitochondrial matrix in eukaryotic cells and in the cytoplasmic membrane in prokaryotic cells. Here they play a crucial role in the production of energy for the cell through the formation of ATP
Explanation:The proteins of the electron transport chain are located in the inner mitochondrial matrix in eukaryotic cells, and in the cytoplasmic membrane in prokaryotic cells. The electron transport chain is a series of electron carriers and ion pumps that help in the production of ATP, which is vital for cellular energy. Key components include multiple large, multi-protein complexes, one of which is cytochrome c, involved in various chemical reactions that create a proton gradient across the membrane. The location of these protein complexes on the inner mitochondrial membrane in eukaryotes enables the effective pumping of protons from the mitochondrial matrix to the intermembrane space of the mitochondria. The proteins embedded in the prokaryotic plasma membrane perform a similar function, facilitating the production of ATP through oxidative phosphorylation.
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The following graph is representative of what type of population growth?
a.
logistic
b.
exponential
c.
linear
d.
triangular
The correct answer is Logistic growth.
In logistic growth the per capita growth of organism decreases as the population size increases and it is due to the limited resources in the environment. The limited resources in the graph is known as carrying capacity(k). Logistics curve always gives a S-shaped graph. The logistic graph depends on the size of the population. Large population will require more resources and less population will require less resources and more time to reach the carrying capacity of the curve. Mostly yeast growth shows this type of graph.
Answer:
Option a. Logistic
Explanation:
We will analyze every option one by one
a. Logistic graph
Logistic graph is a typical S-shaped graph showing three curves.
Starting curve shows a less growth because less number of species.
Then a steep curve showing fast growth because of good number of species then curve showing less growth because of limited resources in the environment.
This option is the correct option.
b. Exponential graph
Exponential graph shows a steep growth in its curve so this option doesn't match the graph.
c. Linear graph
Linear graph shows a straight line so this option is not correct.
d. Triangular
Triangular graph is a three dimensional graph having three vertices. So this option is again not correct.
Therefore Option a. Logistic graph is the correct one.
Nuts and grains are _____. vegetables fruits flowers seeds
nuts ans grains are SEEDS. vegetables fruits flowers seeds
D.Seeds!
Visually, what is the major difference between the seperation of chromosomes between anapahse I and anaphase II?