DNA practice

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

____ 1. In DNA, complementary base pairing occurs between

____ 2. The appropriate adjective to describe DNA replication is

____ 3. The RNA molecule is made up of how many strands?

____ 4. The form of RNA that carries the code from the DNA to the site where the protein is assembled is called

____ 5. The nitrogenous base found in DNA but not in RNA is

____ 6. Which of the following dominates the process of transcription?

____ 7. In transcription,

a.	several RNA molecules are made from the same DNA molecule.
b.	promoters are needed so that RNA can bind to DNA.
c.	DNA produces messenger RNA.
d.	a specific enzyme called RNA polymerase is required.
e.	all of these

____ 8. Which of the following carries amino acids to ribosomes, where amino acids are linked into the primary structure of a polypeptide?

10. In the lactose operon, which of the following are part of the DNA?

a.	an operator.
b.	three structural genes that manufacture lactose-metabolizing enzymes.
c.	a promoter.
d.	a repressor.
e.	all but a repressor.

The obv 11. The obvious advantage of the lactose operon system is that

a.	lactose is not needed as energy for bacteria.
b.	lactose-metabolizing enzymes need not be made when lactose is not present.
c.	the bacteria will make lactose only in the presence of the proper enzymes.
d.	milk is not needed for adult humans' diet.
e.	glucose can substitute for lactose in the diet of intolerant persons.

12.Nucleic acid contains

13. A linear stretch of DNA that specifies the sequence of amino acids in a polypeptide is called a(n)

DNA practice

1. D

2. B

3. A

4. A

5. E

6. A

7. E

8. B