2.6 Structure of DNA and RNA

What is the primary function of DNA?

• To determine the sequence of amino acids in a protein molecule

• To determine the sequence of saccharide monomers in a polysaccharide molecule

• To determine the sequence of traits in an individual

• To determine the sequence of fatty acids in a glycerol molecule

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If 23% of the nitrogenous bases in a DNA molecule are guanine, what percentage of the nitrogenous bases will be adenine?

• 27%

• 23%

• 46%

• 54%

Who is responsible for producing this image?

• Francis Crick

• James Watson

• Rosalind Franklin

• Maurice Wilkins

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The two strands of the DNA double helix are held together by what type of bond?

• hydrogen bonds
• peptide bonds
• covalent bonds
• ionic bonds

What determines the code of a DNA molecule?

• the structure of the nitrogenous bases

• the sequence of the nitrogenous bases

• the type of pentose sugar

• the frequency of nitrogenous bases

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NGSS.HS-LS1-1

Which bases are purines?

• A & T
• C & T
• C & G
• A & G

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How many rings do pyrimidine bases have?

• 1
• 2
• 3
• 4

Which carbon atoms on the pentose sugar does the phosphate molecule bond to?

• 1' & 2'

• 2' & 3'

• 3' & 4"

• 5' & 3'

What is the name of the DNA monomer shown?

• Nucleotide

• Amino acid

• Triglyceride

• Phospholipid

Tags

NGSS.HS-LS1-1

In nucleic acids, which type of bond links the 5-carbon sugars with an organic base?

• Peptide
• Covalent
• Hydrogen
• Phosphate