Mutation of the C group gene in Arabidopsis
thaliana produces flowers that
a. are sterile.
b. have no carpels.
c. have no stamens.
d. have a profusion of petals.
e. are all of these
E
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Imagine that a mutation in a DNA molecule results in the codon CCU being changed to CCC. Both of these codons code for proline. What characteristic accounts for the fact that more than one codon can code for the same amino acid?
A) the ambiguity of the genetic code B) the redundancy of the genetic code C) the universality of the genetic code D) mutations in the genetic code
If a gene contains a guanine nucleotide, the transcribed messenger RNA would have
A. adenine. B. uracil. C. cytosine. D. guanine.
Why is it sometimes a disadvantage to take aspirin to reduce a fever?
A) Aspirin makes you irritable and fatigued. B) Aspirin reduces the fever and stimulates a dangerous inflammatory response. C) Aspirin reduces the production of toxins so that you feel better, even though you are still sick and need to rest. D) Aspirin reduces the fever and therefore decreases the activity of phagocytic white blood cells.
Which one of the following do NOT apply to eukaryotic cells?
A. contain 80S ribosomes B. have histones C. have circular chromosomes D. exhibit growth via mitosis