The Structure of DNA Flashcards

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  • Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

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3️⃣ Consistently Review and Practice:

  • Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
  • Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What is the overall shape of a DNA molecule?

A double helix: two long strands twisted into a spiral.

What is a nucleotide made of?

A sugar (deoxyribose), a phosphate group, and one base.

Name the four DNA bases.

Adenine (A), thymine (T), cytosine (C), and guanine (G).

Which bases pair together in DNA?

A pairs with T, and C pairs with G.

What holds the two DNA strands together?

Weak hydrogen bonds between the paired bases.

How do nucleotides join to form a DNA strand?

The sugar of one bonds to the phosphate of the next, making a sugar-phosphate backbone.

Why is DNA called a polymer?

It is made of many repeating nucleotide units joined in a chain.

How many strands does a DNA molecule have?

Two strands.

What is a base pair?

Two bases joined by hydrogen bonds, either A-T or C-G.

How does DNA store information?

In the order (sequence) of its bases along the strands.