Question

For questions 1-5, complete each statement by writing the correct word or

words.

1. The building blocks of DNA are

2. Nucleotides in DNA are made of three basic components: a sugar called
, and a nitrogenous

3. DNA contains four kinds of nitrogenous bases:
, and

4. In DNA, can be joined in any order.

5. The nucleotides in DNA are joined by
bonds.

Answer 1

1. Nucleotides
2. Deoxyribose,base
3. Adenosine,thymine , cytosine and guanine
5. Hydrogen bonds with a sugar phosphate backbone

Answer 2

1. Nucleotides

2. ribose or deoxyribose, nitrogenous base, and a phosphate group

3. A (adenine), C (cytosine), G (guanine), T (thymine).

4. False. Adenine pairs with Guanine, and Thymine pairs with Cytosine only.

5. covalent