A condition in which one gene pair masks the expression of a nonallelic gene pair is called ________

A) dominance
B) epistasis
C) codominance
D) additive alleles
E) recessiveness


Answer: B

Biology & Microbiology

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When ventricles are full of blood, which valves

are closed?

a. atrioventricular b. aortic c. pulmonary d. aortic and pulmonary e. all of these valves are closed

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You are assembling a model of a chromosome, but begin having some trouble when you get to the step of forming chromatin loops.  If you are unable to resolve this problem, what step of chromosome structure would you be unable to achieve?

A. Nucleosome B. Solenoid C. Histone/DNA complex D. Rosettes

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A polyribosome is:

a. a complex composed of several ribosomes and plus an mRNA transcript. b. a complex componsed of several ribosomes in eukaryotes. c. an initiation complex in eukaryotes. d. an elongation complex in eukaryotes. e. one ribosome complexed to several mRNAs

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A plant cell with 64 available ATP molecules could split how many N2 molecules with the assistance of nitrogenase?

A. 4 B. 32 C. 2 D. 16 E. 64

Biology & Microbiology