Unit 1.1 Review | DNA Structure

Front

What is the structure of DNA?

Back

DNA is a double helix composed of two strands of nucleotides, with a sugar-phosphate backbone and nitrogenous bases (adenine, thymine, cytosine, guanine) paired in the center.

Front

What are the base pairing rules in DNA?

Back

Adenine pairs with Thymine (A-T) and Cytosine pairs with Guanine (C-G) through hydrogen bonds.

Front

What percentage of guanine would be expected if a DNA molecule has 15% adenine?

Back

35% guanine, due to base pairing rules (A-T and C-G).

Front

What holds the two strands of DNA together?

Back

Hydrogen bonds between the nitrogenous bases hold the two strands of DNA together.

Front

What are the components of the DNA backbone?

Back

The DNA backbone is made up of deoxyribose sugar and phosphate groups.

Front

What is the sugar found in DNA?

Back

The sugar in DNA is deoxyribose.

Front

How many hydrogen bonds are between adenine and thymine?

Back

There are two hydrogen bonds between adenine and thymine.

Front

How many hydrogen bonds are between guanine and cytosine?

Back

There are three hydrogen bonds between guanine and cytosine.

Front

What is the complementary sequence to the DNA strand ATTCGCGA?

Back

The complementary sequence is TAAGCGCT.

Front

What is the function of DNA?

Back

DNA stores genetic information and provides instructions for the development and functioning of living organisms.