The mammalian acrosome contains enzymes that
a. digest the zona pellucida.
b. digest the endometrium.
c. stimulate ovulation.
d. stimulate sperm motility.
e. inhibit premature ejaculation.
A
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Quorum sensing generally follows the mechanism of which type of regulation?
A) feedback inhibition B) negative transcriptional regulation C) positive transcriptional regulation D) two-component regulation system
The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as demonstrated by the success of vaccines
a. activation of macrophage cells b. suppression of suppressor cells c. T and B memory cells d. high levels of antigen e. new cytotoxic T cell.
Why are enzymes considered important biological catalysts?
a. Enzymes lower the entropy of a biochemical reaction. b. Enzymes decrease the enthalpy of a biochemical reaction. c. Enzymes increase the free energy of a biochemical reaction. d. Enzymes supply the energy to initiate a biochemical reaction. e. Enzymes lower the activation energy of a biochemical reaction.
Natural selection for a certain phenotype will affect the
A. genotype of a population. B. allele frequency of a population. C. allele frequency of an individual. D. genotype of an individual.