PROCEDUREUse the information in the film to answer the following questions in the spaces provided. You may want to usethe film’s transcript as a reference.1. In the 1950s, many scientists thought that proteins, not DNA, carried genetic information.a. Why did proteins seem better suited for storing genetic information?b. Oswald Avery’s experiments with bacteria led him and other scientists to propose the following claim:DNA, not proteins, carries genetic information. Complete the table below to explain how Avery’sexperiments supported this claim.Claim: DNA, not proteins, carries genetic information.Evidence: (List three pieces of evidence for the claim from Avery’s experiments.)Reasoning: (In full sentences, explain how each piece of evidence supports the claim.)2. What are the chemical components of a DNA nucleotide? _______a. a phosphate, a sugar, and a nitrogenous baseb. a phosphate, a nitrogenous base, and an amino acidc. a nitrogenous base, a sugar, and an amino acidd. a nitrogenous base, ATP, and a sugar3. The two strands of a DNA molecule are held together by hydrogen bonds between the: _______a. phosphate groups on each strandb. nitrogenous bases on each strandc. bases and the phosphate-sugar backboned. carbon atoms in the sugars
Question
PROCEDUREUse the information in the film to answer the following questions in the spaces provided. You may want to usethe film’s transcript as a reference.1. In the 1950s, many scientists thought that proteins, not DNA, carried genetic information.a. Why did proteins seem better suited for storing genetic information?b. Oswald Avery’s experiments with bacteria led him and other scientists to propose the following claim:DNA, not proteins, carries genetic information. Complete the table below to explain how Avery’sexperiments supported this claim.Claim: DNA, not proteins, carries genetic information.Evidence: (List three pieces of evidence for the claim from Avery’s experiments.)Reasoning: (In full sentences, explain how each piece of evidence supports the claim.)2. What are the chemical components of a DNA nucleotide? _______a. a phosphate, a sugar, and a nitrogenous baseb. a phosphate, a nitrogenous base, and an amino acidc. a nitrogenous base, a sugar, and an amino acidd. a nitrogenous base, ATP, and a sugar3. The two strands of a DNA molecule are held together by hydrogen bonds between the: _______a. phosphate groups on each strandb. nitrogenous bases on each strandc. bases and the phosphate-sugar backboned. carbon atoms in the sugars
Solution
Sure, here are the answers to your questions:
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a. Proteins seemed better suited for storing genetic information because they are more complex and have a greater variety of structures than DNA. They are made up of 20 different amino acids, which can be combined in a virtually limitless number of ways, allowing for a vast amount of information to be stored.
b. Evidence from Avery's experiments:
- Avery and his team found that when they destroyed the proteins in a bacteria, the bacteria could still pass on its genetic information.
- When they destroyed the DNA in the bacteria, it could no longer pass on its genetic information.
- They also found that DNA from one strain of bacteria could transform another strain into the first strain.
Reasoning:
- If proteins were the carriers of genetic information, destroying them would prevent the bacteria from passing on its genetic information. But this was not the case.
- On the other hand, destroying the DNA did prevent the bacteria from passing on its genetic information, suggesting that DNA is the carrier of this information.
- The ability of DNA from one strain to transform another strain into the first strain further supports the idea that DNA carries genetic information.
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The chemical components of a DNA nucleotide are: a phosphate, a sugar, and a nitrogenous base (Answer: a).
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The two strands of a DNA molecule are held together by hydrogen bonds between the nitrogenous bases on each strand (Answer: b).
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