During initiation in bacterial translation, a particular mutation causes the premature binding of the large ribosome subunit to the small ribosome subunit. Which component of initiation is not working properly?
A) IF3
B) Ribosome's E site
C) Shine-Dalgarno sequence on the mRNA
D) IF1
E) IF2
Answer: A
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Which of these fungal features supports the phylogenetic conclusion that fungi are more closely related to animals than plants?
A) Fungi are able to change their body shape continuously throughout their life. B) Zygomycetes have flagellated gametes. C) Fungi store polysaccharides as starch. D) The cell walls of fungi are made of chitin.
The agent of microevolutionary change that is most likely to introduce genetic variation from another population is
referred to as ____.
a. genetic drift b. gene flow c. natural selection d. mutation e. nonrandom mating
The text discusses an incident where a number of
whales beached themselves in 2001. What is true about this case? a. It happened near an area where the United States Navy was testing a sonar system. b. Very loud, low-frequency sounds were sent through the water. c. The whales hurriedly surfaced in fear. d. Rapid change in pressure damaged the whales’ acoustic systems. e. All of these are true.
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