Question 1. This base bonds to cytosine
thymine
guanine
adenine
cytosine
uracil
Question 2. Which of the following does not have to contain a DNA molecule?
gene
chromosome
cell
virus
zygote
Question 3. 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. This RNA base bonds to adenine
thymine
guanine
adenine
cytosine
uracil
Question 5. 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. 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. 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. 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. A unit of the genetic code consisting of three nucleotides is called
a mutation
a gene
a codon
messenger RNA
transfer RNA
Question 10. 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. In the DNA molecule, thymine always bonds with
thymine
guanine
adenine
cytosine
uracil
Question 12. 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. Which of the following diseases is not hereditary?
sickle-cell anemia
cystic fibrosis
Familial tendencies to develop cancer
arthritis
All of these are hereditary.