Louis Pasteur disproved the theory of spontaneous generation by proving that cells only come from other cells. So the correct option is D.
What is the theory of spontaneous generation?The theory of spontaneous generation was a baseless theory that suggested that living matter could be produced from nonliving material. It was used to explain the origin of life on earth.
This theory was given by Aristotle. It was challenged by the work of Lazzaro Spallanzani and Francesco Redi. It was finally disproven by Louis Pasteur and John Tyndall.
Louis Pasteur was a French microbiologist and in 1859, he settled the dispute around the spontaneous generation. He did a broth experiment by using Swan neck flasks. As long as the flasks were kept closed, the broth remained clear. It started to become cloudy when the flasks were opened.
This suggested that in an environment where no living matter was allowed to enter, the new living matter was not produced. The new living matter was produced only when flasks were opened and microbes were allowed to enter.
Therefore, Louis Pasteur contributed to the cell theory by disproving the theory of spontaneous generation. So the correct option is D.
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How can the work of biologists help meet the needs of people who live in hot, dry environments?
Both bats and honeybees have wings. Which of the following statements is true?
A. Bats are more closely related to honeybees than to humans.
B. Since they are the result of evolution, honeybee wings and bat wings are homologous structures.
C. Since they do not come from a common ancestor, honeybee wings and bat wings are analogous structures.
D. Since they both have wings and humans do not, neither bats nor honeybees are related to humans at all.
Answer:
D is the anwser
Explanation:
How do sexual and asexual reproduction differ in inherited genetic material?
A) In asexual reproduction, offspring are exact copies of the parent organism. In sexual reproduction, offspring get a unique combination of genes from parents.
B) In asexual reproduction, offspring get a unique combination of genes from parents. In sexual reproduction, offspring are exact copies of the parent organism.
C) In asexual reproduction, offspring differ from each other. In sexual reproduction, offspring are identical to each other.
Answer: A. In asexual reproduction, offsprings are exact copies...
Explanation: It can’t be B because asexual reproduction only requires 1 parent. It also can’t be C because it’s literally the exact opposite, this is why human children don’t look exactly like their parents. Hope this helped!
A teacher asked each student in the class to make a model demonstrating the importance of solar energy for life on Earth. Which model should a student make?
A. A model of the electromagnetic spectrum
B. A model of a local food web
C. A model of the water cycle
D. A model of a mitochondrial matrix
Which statements correctly describe whether a compound is a pure substance
Answer:
b
Explanation:
What is the correct sequence of events in transcription and translation?
A. RNA to DNA to protein
B. DNA to RNA to protein
C. DNA to RNA to lipids
The correct sequence of events in gene expression is DNA to RNA to protein, starting with transcription and followed by translation. In transcription, DNA is transcribed into mRNA, which is then translated into a protein with the help of tRNA. cDNA helps in understanding an organism's proteins by representing only expressed genes.
Explanation:The correct sequence of events in transcription and translation is DNA to RNA to protein. The process starts with transcription where DNA is converted into mRNA (messenger RNA). This happens in the nucleus of the cell. The mRNA then travels out of the nucleus to the cytoplasm where translation occurs. During translation, the mRNA is read by a ribosome, and tRNA (transfer RNA) brings the appropriate amino acids to create a polypeptide chain, which will fold into a functional protein.
Transcription - DNA is transcribed to produce mRNA.Traveling of mRNA out of the nucleus - After being processed, the mRNA molecule exits the nucleus.tRNA binding to mRNA - Occurs during translation as tRNA molecules bring amino acids to build the polypeptide chain based on the sequence of the mRNA.Folding of the polypeptide - The polypeptide folds into its final protein structure.The differences between a sequence of DNA and the sequence of mature mRNA include the removal of introns (non-coding regions) from the pre-mRNA during RNA processing, resulting in only exons (coding regions) being included in the mature mRNA. Additionally, a 5' cap and a poly-A tail are added to the mRNA for stability and regulation of translation.
Complementary DNA (cDNA) created by reverse transcribing mRNA can be particularly useful for understanding an organism's proteins because it represents only the expressed genes and skipping non-coding regions, allowing for a simpler analysis of the coding potential of a genome.
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2. Why is the kingdom Protista not valid under evolutionary classification? (1 point)
Protists are all very similar and easy to confuse.
Protista contains groups that share closests common ancestors with other groups, rather than with each other.
Protists are the most numerous organisms on Earth.
Protista evolved before any other kingdom, and as such share a most recent common ancestor with each other, as opposed to any other group.
Protista is not valid under evolutionary classification because it's considered a paraphyletic group. In this kingdom, groups have closer common ancestors with groups outside of Protista than within it. This is inconsistent with evolutionary classification, which emphasizes common descent and shared ancestry.
Explanation:The kingdom Protista is not valid under evolutionary classification primarily because this group is considered to be paraphyletic. A paraphyletic group consists of all the descendants of a common ancestor, excluding one or more groups. For instance, Protista includes various groups that hold the closest common ancestors in kingdoms outside of Protista, rather than within the same kingdom.
This is inconsistent with the principles of evolutionary classification, which emphasizes the concept of common descent. This approach to classification orders organisms based on their evolutionary relationships, meaning that all members of a particular group (whether it's a domain, kingdom, phylum, etc.) should share a most recent common ancestor that is not the ancestor of any organisms outside the group.
So, although some members of Protista are closely related, the kingdom as a whole does not meet these criteria, because it lacks that shared ancestry. Therefore, it is not recognized as a valid group in the current understanding of evolutionary classification.
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Which cellular process that carries out the hereditary instructions would be affected by a mutation?
A mutation can affect gene expression, leading to changes in the transcription and translation processes, which can result in hereditary diseases or cancer. Heritable information in eukaryotes is transferred through mitosis, meiosis, and fertilization. Mutations are essential for introducing new genetic variations in populations.
Explanation:The cellular process that would be affected by a mutation is known as gene expression, which includes transcription and translation of hereditary instructions in DNA into functional proteins. A mutation, being a heritable change in the DNA sequence, can affect the structure and function of proteins, potentially leading to an altered phenotype. If the mutation occurs in a germ cell, it can be passed on to offspring, potentially resulting in hereditary diseases. Conversely, if the mutation occurs in a somatic cell, it can be propagated through cell division in that organism, which can sometimes cause cancer if the mutation is oncogenic.
In eukaryotes, heritable information is passed to the next generation through the cell cycle, including processes of mitosis and meiosis, followed by fertilization. Mutations introduce new genetic variations into a population, which can have various effects. These can range from no visible change to significant alterations in the organism's characteristics, and are crucial for the process of evolution.
A mutation affects cellular processes by changing the DNA sequence that might result in altered protein functions. Mutations in germ cells can lead to hereditary diseases, whereas mutations in somatic cells can cause cancer. The transfer of heritable information in eukaryotes is heavily rooted in processes like mitosis, meiosis, and fertilization which can be influenced by these mutations.
Explanation:A mutation is a change in the DNA sequence that can affect cellular processes by altering the instructions carried out by a cell. If a mutation occurs in a germ cell, it may be passed to offspring, potentially resulting in hereditary diseases. In contrast, mutations in somatic cells can lead to cancer if they cause cells to become malignant.
In eukaryotic organisms, heritable information is passed down through the cell cycle and processes such as mitosis or meiosis plus fertilization. These processes are vital for the proper transfer of genetic information, and mutations can significantly alter the outcome of these processes.
A mutation can lead to a different phenotype by inducing changes in the DNA, which are then transcribed to mRNA and translated into altered amino acid sequences in proteins. Since proteins perform critical cellular functions, changes in their structure due to mutations can have far-reaching implications for the organism.
Which of the test tubes shown below were most likely produced by a sprig of Elodea and a snail in the dark after 24 hours of incubation?
Answer:
The correct answer is - test tube 4.
Explanation:
The sprig of Elodea produces carbon dioxide and oxygen after the incubation of 24 hours whereas the snail releases the oxygen in the test tube during the incubation period. The presence of both gases gives a yellowish color to the test tube solution.
Incubation is the process in which organisms or anything at a precise environment and temperature so it can develop properly.
Thus, the correct answer is- test tube 4.
How would the food web be affected if the phytoplankton were removed?
The food web will be greatly affected if the phytoplankton were removed
Meaning of phytoplankton and their rolePhytoplankton is a Producer, that is they make their own food using sunlight.
Phytoplankton is very important in the aquatic food web as they serve as food to consumers of different kind in the aquatic habitat.
In a case of removal or unavailability of phytoplankton, higher tropic level organisms can't get their nutrition from it and this will lead to death.
In conclusion, The food web will be greatly affected if the phytoplankton were removed
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In a population, when the birthrate becomes higher than the death rate, the population's growth rate
decreases.
increases.
slows to a stop.
levels off and remains constant.
Which organ in the body is primarily responsible for breaking down fats?
a. spleen.
b. pancreas.
c. stomach.
d. gall bladder.
Answer:
gall bladder
Explanation:
Which if the following is NOT a product of the Krebs Cycle?
A) water
B) carbon dioxide
C) ATP or GTP
D) FADH2
The following is NOT a product of the Krebs Cycle is FADH2. The correct option is D.
What is the Krebs Cycle?The Krebs cycle is also called the tricarboxylic acid and citric acid cycle. This cycle works under aerobic conditions. This produces energy in bodies. Krebs cycle converts acetyl CoA molecules into NADH.
Pyruvic acid and acetyl-CoA combine to create glucose in this mechanism. The Krebs cycle, commonly known as the aerobic stage because it takes place in the presence of oxygen, is the second step of cellular respiration.
Given that anaerobic organisms cannot survive in the presence of oxygen, we might infer from this that not all living things participate in the Krebs cycle. NADH is not produced in this cycle.
Therefore, the correct option is D. FADH2.
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A biologist is writing a report about a group of rattlesnakes that all live in the state of Florida. All rattlesnakes in this group can breed with one another and produce offspring that can reproduce together. The report includes statistics about the number of these rattlesnakes, their breeding rate, and the ranges of their sizes and other traits. In this report, the biologist is describing?
A.a community in Florida.
B.a biome in Florida.
C.a population in Florida.
D.an organism in Florida.
Answer: C. a population in Florida
As a biologists is writing about a report on group of rattlesnakes that all lived in the state of Florida. It is mentioning about the species of a particular snake but a group of organisms considering a group or organisms which breed with one another and produce offsprings that can reproduce together. All these features can be defined under a single term called as population. Members of species that are be breed with each other and can produce viable fertile offsprings is called as population. Therefore, in this report biologist is describing about population in Florida.
Answer:
The correct answer is option C, a population in Florida
Explanation:
The population description is an efficient language is termed as demographics. The descriptive components of the demographics are –
a) Population Size – It gives the number of individuals within a population
b) Population Density – It defines the size of a population with respect to the space occupied by it
c) Age Structure of the Population – It categorizes different individuals in a population group to different age sections
d) Fecundity – It describes about an individual that is able to produce during a given period of time
e) Morality – It gives the death and birth rate of a population
f) Sex ratio
a lipid has three long chains of fatty acids and
a. is found in fructose
b. is healthy for the heart
c. three amino acids
d. one molecule of glycerol
two cells in the same organism differ only in the number of chloroplasts they contain. the first cell had multiple chloroplasts, and the second cell has very few. what would most likely characterize these cells?
Answer:
The second cell would not be able to produce as much food because its not getting as much sunlight.
Explanation:
I just did it
How do cells in animals get energy??
Answer: animals cell get energy by..
Animals obtain energy by eating plants. The only form of energy a cell can use is a molecule called adenosine triphosphate (ATP). Chemical energy is stored in the bonds that hold the molecule together. ADP can be recycled into ATP when more energy becomes available.
Explanation:
The cells of animals considerably rely on the process of cellular respiration in order to get energy.
What is Cellular respiration?Cellular respiration may be defined as a process through which cells of living organisms produce energy with the help of the breakdown of food molecules into simpler substances.
Cellular respiration, also known as aerobic respiration significantly involves the sequence of chemical reactions which initiate with the reactants like sugar (glucose) in the presence of oxygen in order to produce carbon dioxide, water, and energy. Here, the energy that is synthesized must be in the form of ATP.
Cellular respiration is again split into a variety of reactions like glycolysis, the Citric-acid cycle, oxidative phosphorylation, etc. But the ultimate aim of all remains the same which is the production of energy.
Therefore, the cells of animals considerably rely on the process of cellular respiration in order to get energy.
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A glass dish containing a few drops of water in the presence of carbon dioxide gas, nitrogen gas, and small organic compounds is heated by a flame and UV radiation. Which early Earth scenario does this set-up most closely resemble?
a. amino acid formation from organic molecules in ocean water splashing on hot rock, sand, or clay
b. deep sea volcanoes giving off gases, sulfur, and iron to produce organic molecules
c. lightning in the early atmosphere, which may have produced the first organic molecules
d. the replication of RNA near the ocean's surface in the day and night cycling of temperatures
The correct answer is (a )
This experiment shows that the life has evolved from the inorganic materials. The substances like carbon dioxide, nitrogen gas when heated and exposed to UV radiation led to generation of life supporting element called as amino acids. The UV radiation and heat provided the energy needed by gases to convert into amino acids.
Predict the next digestive system organ in the following sequence:
mouth, pharynx, esophagus, stomach, _______
A)
liver
B)
kidneys
C)
small intestine
D)
large intestine
The correct answer is option C
The small intestine known as Duodenum is the next organ in the digestive system. Liver comes before the stomach and the large intestine surrounds the small intestine and its function also starts when the di-gested food passes from the small intestine to the large intestine. Kidney is the part of urinary system and not the digestive system.
__________ energy is the energy that it takes to remove an electron from its shell.
Question 2 options:
Ionization
Electron
Polar
Quantum
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Polyatomic ions such as (nh4) and nitrate ions (no3) are ions that consist of
A cell with 5% salute concentration is placed in a beaker with a 1% salute concentration what will happen to the cell overtime
An example of skeletal muscle is?
a.the heart
b.the lungs.
c.the leg
d.the stomach
Answer: The correct answer is -
c. the leg.
Skeletal muscle is one of three major categories of muscle tissues (other two being smooth muscle and cardiac muscle.
This is striated muscle tissue, which is voluntary in nature (therefore also termed as voluntary muscle) and lies under the somatic nervous system.
Majority of skeletal muscles are connected to bones with the help of tendons (which are bundles of collagen).
Skeletal muscles provide support to the body and assist in movement. This is because contraction of skeletal muscle allows pulling of tendons, which are basically attached to bone. This assist in movement of legs (such as walking, jumping).
This indicates that every physical activity performed by an organsim is related to skeletal muscle.
Thus, muscles associated with legs are example of skeletal muscles.
Therefore, option c) is the right answer.
Explain the relationship between light intensity and the daily rhythm of flowers opening.
Light energy is used by the flower to bloom that could allow the flower to remove its pollen for the pollination process. Also the light allows the flower or the plants to make food and that is why they bloom if its is portrayed be the light.
Explanation:
The greater the intensity of light, the more photons or photoelectrons there are and consequently the increase in photocurrent. Thus, the larger the energy, the greater the wattage of the light source.
In which of the following ways is DNA replication different from DNA transcription? A) New cells can only be created after transcription has taken place. B) Replication results in mRNA strands while transcription creates new DNA. C) Transcription happens outside the nucleus and replication happens inside the nucleus. D) Thymine is used in replication while uracil is used in transcription.
Answer: Option D
Explanation:
At the time of DNA replication the nitrogenous bases used is thymine because DNA is the end product of replication.
Whereas, in case of translation the end product is mRNA in which the nitrogenous base used is uracil.
Both of the process combinely helps in cell division and formation of new cells.The proliferation of cell is very crucial and important step inside the cell.
why do plants not need heterotrophs
Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite skin, what kind of microscope should you use?
Fish populations and other aquatic resources are likely to be affected by changes in what aquatic factors? a. water temperatures b. disease c. water quality d. all of the above Fish populations and other aquatic resources are likely to be affected by changes in what aquatic factors: water temperatures
The correct answer is - d. all of the above.
The fish populations and other aquatic resources can be affected by multiple factors. The water temperature is a defining factor, if it is colder than lots of marine life will dye out and be replaced with other species, and vice versa, if its too warm lots of marine life adapted to colder conditions will die out. Diseases are always an impact factor in any environment, so if a dangerous, fatal, disease appears, it can demolish the populations of the aquatic organisms. The water quality is becoming an ever-growing concern, and that is because of the human activity. If the water gets polluted, or eutrophicized, the marine life will very quickly die out and leave empty waters behind it.
Which structures are connected to the peripheral nervous system?
When discussing the Earth's magnetic field we could say that the Earth has a
Answer:
When discussing the Earth's magnetic field we could say that the Earth has a GEOMAGNETIC NORTH POLE. The magnetic field changes every several hundred thousand years and thus the north and south magnetic poles swap places. Hope this is the answer that you are looking for.
North Magnetic Pole
Explanation:
The terrestrial magnetic field is what makes possible the existence of compasses, used for location in space. Thanks to this invention, the great navigations could happen.
The dynamo theory is the most accepted for the explanation of the terrestrial magnetic field. According to this idea, iron and molten nickel, about 3,000 km deep, move around generating electrical currents that trigger the magnetic field.
Magnetic poles
A magnet has a north pole and a south pole. The magnetic field generated by the magnets, which is the region near the magnet where another magnet or materials such as iron and steel are attracted, is represented by exiting the north pole and entering the south pole.
When the magnetized needle of a compass aligns with the earth's magnetic field, the north pole of the needle points to the northern region of the planet and the south pole of the compass magnet points to the southern region of the planet.
The attraction occurs only between different poles, that is, if the north pole of the needle points to the geographic north, it means that what we call geographic north is the magnetic south pole of the earth. Similarly, the geographic south pole of the planet must be the magnetic north pole. The image above reveals this inversion between the magnetic and geographic poles.
The earth is a giant magnet, and its magnetic field protects us from particles from the sun.