DNA Structure & Replication - Gen Bio

In nucleotides, the letters A, G, C and T represent

• phosphate groups
• deoxyribose sugars
• nitrogen bases
• ribose sugar

In a nitrogen base pair, guanine always pairs with __.

• adenine
• cytosine
• thymine
• guanine

In a nitrogen base pair, thymine always pairs with __.

• adenine
• cytosine
• thymine
• guanine

In a nitrogen base pair, adenine always pairs with __.

• adenine
• cytosine
• thymine
• guanine

In a nitrogen base pair, cytosine always pairs with __.

• adenine
• cytosine
• thymine
• guanine

The structure of DNA is referred to as a ___ because it is a twisted ladder.

• Double-helix
• Chromosome
• Gene

Use the diagram and your knowledge of biology to answer this question. Structures 3 and 4 are held together by?

• weak hydrogen bonds
• strong covalent bonds

Use the diagram and your knowledge of biology to answer this question. How many nucleotides are present in the diagram below?

• 5
• 10
• 15
• 30

In the double helix model of DNA, the structure labeled "e" below is best described as a/an:

• nucleotide
• nitrogen base pair
• amino acid group
• codon

In the double helix model of DNA, the structure labeled "c" below is best described as a/an:

• nucleotide
• hydrogen bonds

• amino acid group
• codon