Why does data on observable mutant phenotypes underestimate the actual frequency of mutation?
A. Many mutations are in non-coding regions
of the genome.
B. Some mutations in protein coding regions
of the genome are synonymous or silent
mutations.
C. Most mutations result in death of the
individual or an inability to reproduce.
D. a and b
E. a, b, and c
D
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Release of T4 phage from host cells after assembly
A. occurs by exocytosis. B. occurs by extrusion and does not result in cell lysis. C. requires holin protein that allows the T4 lysozyme to attack the peptidoglycan. D. depends on a protein that interacts with MurA and interferes with normal peptidoglycan synthesis.
Stomata generally open in response to ____
a. the release of abscisic acid by the roots b. a drop in CO2 concentration in leaf air spaces c. exposure to red light d. a drop in O2 concentration in leaf air spaces e. an increase in CO2 concentration in the leaf air spaces
At the molecular level, how do proteins like repressors bind to DNA? How can binding affinities be increased or decreased?
What will be an ideal response?
Which of the following is a disadvantage of a correlational experiment?
A) Subjects may not know exposure levels. B) It is expensive and time consuming. C) It is not feasible for rare diseases or environmental factors of interest. D) It is only feasible for hypotheses for which an experimental treatment can be applied.