Which of the following ions is most likely to passively cross the plasma membrane of a resting neuron?
A. Na+
B. Cl-
C. Mg2+
D. Ca2+
E. K+
Ans: E. K+
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The following will increase the rate of reaction:
A. free energy of product lower than that of substrate B. free energy of product lower than that of transition state C. interactions between atoms during the transition state D. enzyme complementary to substrate E. number of covalent groups combining with substrate during the reaction
Human skin color is an example of ____, while sickle-cell anemia is an example of ____
a. multiple alleles; epistasis b. incomplete dominance; multiple alleles c. polygenic inheritance; pleiotropy d. pleiotropy; polygenic inheritance e. incomplete dominance; pleiotropy
Inherited mutations in the Xist promoter lead to defects in which epigenetic process?
A) RNAi B) X-inactivation C) genomic imprinting D) position effect variegation E) methylation of CpG islands
A ball-and-socket joint connects _____
A) the radius to the ulna B) the radius to the humerus C) the ulna to the humerus D) the humerus to the scapula