If a particular protein were being produced in excess of the cell's needs, then __________ mechanisms
intervene to stop production.
a. metabolic
b. homeostatic
c. growth
d. respiratory
e. anabolic
B
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How does an "activated" receptor transfer information into the cell?
A. by altering its ligand-binding site B. through a conformational change C. by decreased phosphorylation D. by increased translation
The primary source of energy for most organisms is ultimately derived from
A. glucose. B. glycogen. C. plants. D. the sun. E. catabolism.
Which of the following is a difference between how a frog and chytridiomycetes obtain energy?
A. Frogs ingest their food; chytridiomycetes secrete digestive enzymes. B. Chytridiomycetes ingest their food; frogs secrete digestive enzymes. C. Frogs are heterotrophs; chytridiomycetes are phototrophs. D. Chytridiomycetes are heterotrophs; frogs are phototrophs. E. Frogs are autotrophs; chytridiomycetes are phototrophs.
Adding acetyl and methyl groups to a histone regulates gene expression by _________________.
A. increasing the pH of the cell B. loosening the DNA wound around the histone C. modifying the nucleotides of the promoter region of the DNA molecule D. tightening the DNA wound around the histone E. enhancing the development of a DNA-RNA hybrid