Which of the following statements concerning enzymes is FALSE?
a. Each enzyme has an optimal temperature.
b. Each enzyme has an optimal pH.
c. Most enzymes are highly specific.
d. Some enzymes require cofactors.
e. Most enzymes are RNA molecules.
e
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What is the end result of activation of the MAP kinase pathway?
A. the formation of second messengers in the cytosol B. a change in gene expression resulting in cell division C. the activation of adenylyl cyclase D. both the activation of adenylyl cyclase and the formation of second messengers
The vast majority of proteins expressed early in an animal's development
a. are translated from preexisting mRNAs present in the unfertilized egg. b. are translated from preexisting mRNAs delivered by the sperm that fertilized an egg. c. are translated from mRNAs that were transcribed from the zygote's DNA in the first three rounds of cell division. d. are transcribed and translated from the unfertilized egg's DNA postfertilization. e. were present as inactive proteins in the unfertilized egg.
Which of the following is NOT associated with
alveolus structure?
a. stratified squamous epithelium b. secretory cells c. pulmonary capillaries d. basement membrane e. all of these are associated with alveolus structure
Which of the following is not a form of genetic drift?
A) Founder effect B) Nonrandom mating C) Population bottleneck D) Heterozygote advantage E) All of these are forms of genetic drift.