A nucleotide consists of

Answer: A sugar, a phosphate, and a nitrogenous base Three components: pentose sugar, phosphate group, nitrogenous base.

Which is <strongNOT</strong a difference between DNA and RNA?

Answer: DNA is built from nucleotides; RNA is built from amino acids Both are nucleic acids built from nucleotides. The other three are real differences.

In DNA, adenine pairs with thymine via hydrogen bonds, while guanine pairs with cytosine via hydrogen bonds.

Answer: 2; 3 A=T (2 H-bonds), G≡C (3 H-bonds). G-C pairs are slightly stronger due to the extra hydrogen bond.

AP Biology · Topic 1.6

Nucleic Acids Practice

Q: Which is <strongNOT</strong a difference between DNA and RNA?

Answer: DNA is built from nucleotides; RNA is built from amino acids Both are nucleic acids built from nucleotides. The other three are real differences.

Q: In DNA, adenine pairs with thymine via hydrogen bonds, while guanine pairs with cytosine via hydrogen bonds.

Answer: 2; 3 A=T (2 H-bonds), G≡C (3 H-bonds). G-C pairs are slightly stronger due to the extra hydrogen bond.

Part of Chemistry of Life.(SYI-1.F)

Practice questions

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Sample questions

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Sample 1difficulty 1/5
$A nucleotide consists of$
- A
  $A sugar, a phosphate, and a nitrogenous base$
  check_circle
- B
  $An amino acid, a phosphate, and a base$
- C
  $A fatty acid, a sugar, and a base$
- D
  $Two phosphates and a glycerol backbone$
Why
$Three components: pentose sugar, phosphate group, nitrogenous base.$
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Sample 2difficulty 2/5
$Which is <strong> NOT </strong> a difference between DNA and RNA?$
- A
  $DNA is built from nucleotides; RNA is built from amino acids$
  check_circle
- B
  $DNA is typically double-stranded; RNA is typically single-stranded$
- C
  $DNA contains deoxyribose; RNA contains ribose$
- D
  $DNA uses thymine; RNA uses uracil$
Why
$Both are nucleic acids built from nucleotides. The other three are real differences.$
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Sample 3difficulty 2/5
$In DNA, adenine pairs with thymine via _______ hydrogen bonds, while guanine pairs with cytosine via _______ hydrogen bonds.$
- A
  $2; 3$
  check_circle
- B
  $1; 2$
- C
  $3; 4$
- D
  $3; 2$
Why
$A=T (2 H-bonds), G\equivC (3 H-bonds). G-C pairs are slightly stronger due to the extra hydrogen bond.$
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Sample 4difficulty 2/5
$The genetic code is nearly universal across all life on Earth. This similarity is best explained by$
- A
  $Random chance producing identical codons across taxa$
- B
  $Convergent evolution toward an optimal coding system$
- C
  $Shared evolutionary descent from a common ancestor$
  check_circle
- D
  $Independent origin of the same code in each lineage$
Why
$A nearly universal code is strong evidence that all living things descend from a common ancestor (LUCA).$
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Sample 5difficulty 2/5
$The two strands of a DNA double helix are antiparallel, meaning$
- A
  $They run in the same direction$
- B
  $One runs 5'\to3' and the other 3'\to5'$
  check_circle
- C
  $They have different bases$
- D
  $They never touch$
Why
$Antiparallel orientation is required for proper base pairing geometry.$
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