Cholesterol is present in the membranes of all
a. cells.
b. eukaryotic cells.
c. animal cells.
d. plant cells
Ans: c. animal cells.
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Which of the following occurs to transmit signals from one neuron to another?
a. Electrical signals cross the synapse. b. An action potential jumps the synapse. c. ATP starts an action potential in the postsynaptic cell. d. The presynaptic cell releases a neurotransmitter
A mutation in a ribosome binding site in the lac operon would likely result in
A) reduction in the amount of LacZ, LacY, or LacA protein. B) reduction in the amount of LacZ, LacY, and LacA proteins. C) complete loss of transcription of the lac operon. D) a lac mRNA that is shorter than wild-type.
Which of the following is actively transported in the proximal tubules of the kidney?
a. bicarbonate ions b. sodium ions c. chloride ions d. water e. ADH
A black Angus bull named Charlie is heterozygous (Bb) for coat color (B = black and b = brown). Charlie's black coat color is his
A) genotype. B) heterozygous state. C) gene conversion state. D) phenotype. E) homozygous state.