In all multi-celled fungi, reproduction begins with ____
a. fusion of male and female gametes
b. budding from diploid fruiting structures
c. hyphal fragmentation
d. fusion of gametophytes
e. fusion of haploid hyphae
ANSWER: e
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Chronic myelogenous leukemia is an example of a proto-oncogene activation by ____
A. Action of a virus B. Missense mutation C. A translocation D. Gene amplification E. None of the answers are correct
The concept that a set of three nucleotides specifies a particular amino acid provides the basis for
a. the one gene, one enzyme hypothesis. b. the one gene, one polypeptide hypothesis. c. the genetic code. d. biochemical reactions among nucleic acids. e. Mendelian genetics.
What factor allows the dominant mutant allele for Huntington's disease to persist in human populations
despite its devastating effects? a. Heterozygote advantage. b. The fact that its symptoms do not typically show until after the individual has had children. c. Its effects are not expressed in heterozygous individuals. d. Its effects are only expressed in homozygous recessive individuals. e. Its effects are only expressed in homozygous dominant individuals
A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also shown:
5'-AUGGUGCUGAAG : methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.) A) methionine-valine-methionine-lysine B) methionine-lysine-leucine-lysine C) methionine-leucine-leucine-lysine D) methionine-methionine-leucine-lysine E) methionine-valine-leucine-lysine