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ASSORTED MULTIPLE CHOICE QUESTIONS
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1. The Trp operon includes a series of genes that are needed by bacteria to produce tryptophan. When there is lots
of tryptophan available to the bacteria, what will happen?
a) Repressor proteins (TrpR) will not be made.
b) Repressor proteins (TrpR) will bind to the operator and prevent transcription of the genes.
c) Transcription factors will not bind to trigger transcription.
d) The ribosome will not be able to bind to produce the proteins needed.
2. How many carbons are there in the molecule shown to the right?
a) 1
b) 3
c) 6
d) 12
3. The molecule shown to the right is an amino acid. What kind of amino acid is this?
a) Nonpolar
b) Polar
c) Positively Charged
d) Negatively charged
4. Beta sheets are one type of secondary protein structure. Beta sheets are formed by
a) Peptide bonds
b) disulfide bridges (bonds)
c) Ionic attractions
d) hydrogen bonds
5. Spongebob Squarepants is looking for his biological father. He knows that he has AB type blood. His mother
had B type blood. What could his father’s blood genotype be?
a) IBIB
b) IAIB
c) IBi
d) ii
6. One trait in ivy plants is the presence of spots. The purple spotted allele (h) is recessive while the gold spotted
allele (H) is dominant. The ability to show spots is controlled by another gene—M. Only ivy plants with an M
allele will be able to show their spots. Otherwise, they will show no spots at all, regardless of the H or h alleles
they might possess. This is an example of
a) Polygenic Inheritance
b) Epistasis
c) Sex-linked inheritance
d) Codominance
7. When an enzyme that is usually active has a phosphate bound to it, it stops functioning. This occurs because
a) the phosphate binds to the active site to prevent other molecules from binding.
b) the phosphate destroys the enzyme.
c) the phosphate changes the shape of the enzyme, thus changing its function
d) the phosphate causes the enzyme to bind to another enzyme so that it no longer can function.
8. Suppose scientists are trying to engineer a synthetic tRNA that will be able to carry the amino acid Tyrosine
(Tyr). What anticodon should this tRNA contain?
a) CUU
b) UUU
c) AUA
d) AUG
e) UAG
9. There are 4 different genes of interest on Chromosome 2—genes F, J, B, and Y. Previous research has found the
following recombination frequencies between these genes to be the following:
What order are these genes in on Chromosome 2?
Genes
Recombination
Frequencies
What order are these genes in on Chromosome 2?
J&F
7%
a) JYFB
b) YFJB
c) BYFJ
d) FBYJ
J&B
18%
J&Y
5%
B&F
11%
B&Y
13%
F&Y
2%
Answers: 1-B, 2-C, 3-A, 4-D, 5-B, 6-B, 7-C, 8-C or D, 9-A, 10-A
10. Color-blindness is a recessive trait that is carried on the X chromosome. Suppose a colorblind woman marries
a man who is not color blind. What is the % chance that their daughter will be colorblind (% chance of possible
genotypes for daughters only, not all children)?
a) 0%
b) 25%
c) 50%
d) 75%
e) 100%
Answers: 1-B, 2-C, 3-A, 4-D, 5-B, 6-B, 7-C, 8-C or D, 9-A, 10-A