A cell's ability to control its level of gene expression is called
A. gene splicing.
B. gene transformation.
C. gene addition.
D. gene regulation.
E. gene correction.
Answer: D
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A diploid organism that has two identical alleles for a given trait is called _______ for that trait.
A. homozygous B. heterozygous C. dominant D. recessive E. codominant
Trichloroethylene (TCE) is toxic to humans because it
A. depletes nitrogen from soils. B. is carcinogenic. C. contains heavy metals. D. prevents CO2 production by plants. E. causes a decrease in the yield of crop plants.
Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?
A. small population B. no selection of one phenotype over another C. no net migration of alleles into or out of the population D. no net mutations E. random mating population
It is called a ________ vector when the vector organism has a role in the pathogen's life cycle
A) biological B) zoonotic C) fomite D) mechanical E) vehicle