Understanding DNA Structure

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Questions and Answers

What is the structure of DNA?

Single helix consisting of a single chain of nucleotides
Double helix consisting of two long chains of nucleotides twisted together (correct)
Spiral helix consisting of a spiral chain of nucleotides
Triple helix consisting of three long chains of nucleotides twisted together

Which nitrogenous base always pairs with thymine in DNA?

Cytosine (C)
Guanine (G)
Adenine (A) (correct)
Uracil (U)

Which enzyme is responsible for separating the two strands of DNA during replication?

DNA polymerase
Ligase
Helicase (correct)
Primase

What is the function of primase in DNA replication?

<p>Synthesizes RNA primers (A)</p> Signup and view all the answers

What forms the rungs of the DNA ladder?

<p>Adenine always pairing with thymine, and guanine always pairing with cytosine (D)</p> Signup and view all the answers

Flashcards

What is the structure of DNA?

A DNA molecule is composed of two strands that wind around each other in a spiral shape, resembling a twisted ladder.

Which nitrogenous base always pairs with thymine in DNA?

Adenine (A) forms a base pair with thymine (T), and they always pair together in a DNA molecule.

What is the function of helicase in DNA replication?

Helicase is an enzyme that separates the two strands of DNA during replication, breaking the bonds holding them together.

What is the function of primase in DNA replication?

Primase is an enzyme that synthesizes short RNA primers, which provide a starting point for DNA polymerase to build the new DNA strand.

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What forms the rungs of the DNA ladder?

The rungs of the DNA ladder are formed by paired nitrogenous bases: adenine (A) always pairing with thymine (T), and guanine (G) always pairing with cytosine (C)

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