Question

1. Question : This base bonds to cytosine

thymine

guanine

adenine

cytosine

uracil

Question 2. Question : Which of the following does not have to contain a DNA molecule?

gene

chromosome

cell

virus

zygote

Question 3. Question : Which statement about viruses is false?

Viruses kill the cell.

Viruses are RNA segments coated with protein.

Viruses can metabolize.

Viruses are DNA segments coated with protein.

Viruses use the cell’s enzymes.

Question 4. Question : This RNA base bonds to adenine

thymine

guanine

adenine

cytosine

uracil

Question 5. Question : The genetic distribution 9:3:3:1 is characteristic of

the second generation, one gene trait.

the first generation, four gene traits.

the third generation, four gene traits.

the second generation, two gene traits.

none of these.

Question 6. Question : Which does not follow from Mendel’s work?

All organisms employ the same genetic code.

Traits can be either dominant or recessive.

Units of inheritance pass traits from parents to offspring.

Both parents contribute equally to the traits of the offspring.

Tallness is dominant over shortness in pea plants.

Question 7. Question : What is a codon?

the genetic code

a set of three bases on the mRNA

a set of three bases on the tRNA

an amino acid string

a protein

Question 8. Question : Which could be an example of DNA sequencing?

0 1 1 1 0 0

C A T C A T

T U T T A T

a b c d e f

+ – – + + –

Question 9. Question : A unit of the genetic code consisting of three nucleotides is called

a mutation

a gene

a codon

messenger RNA

transfer RNA

Question 10. Question : Which of the following statements about DNA is false?

DNA molecules are made of smaller molecules.

Every living cell on earth contains DNA molecules.

DNA strands contain alternating sugar and phosphate molecules.

DNA is the mirror opposite of RNA.

Hydrogen bonds join the two sides of the DNA ladder.

Question 11. Question : In the DNA molecule, thymine always bonds with

thymine

guanine

adenine

cytosine

uracil

Question 12. Question : A genetic disease can be expressed in the offspring when

(1) both parents had a recessive gene for that disease.

(2) both parents had a dominant gene for that disease.

(3) only one parent had a dominant gene for that disease.

(4) only one parent had a recessive gene for that disease.

1

2

3

4

1, 2, or 3

Question 13. Question : Which of the following diseases is not hereditary?

sickle-cell anemia

cystic fibrosis

Familial tendencies to develop cancer

arthritis

All of these are hereditary.