The activity of adenyl cyclase is influenced by ________.

A. the presence of lactose in the environment
B. homoserine lactones
C. the phosphotransferase system
D. None of the choices are correct.


Answer: C

Biology & Microbiology

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Consider the food chain of grass ? grasshopper ? mouse ? snake ? hawk. About how much of the chemical energy fixed by photosynthesis of the grass (100 percent) is available to the hawk?

A) 0.01% B) 0.1% C) 1% D) 10% E) 60%

Biology & Microbiology

Amino acid sequences evolve through: (choose all that apply)

A. mutation. B. selection. C. adaptation. D. translation.

Biology & Microbiology

DNA has a double helix structure. Refer to the figure below. What two components make the outside rails (called the backbone) of the double helix?



a. nitrogenous bases and carbon
b. hydrogen and ribose
c. sugar and phosphate
d. enzymes and sugar

Biology & Microbiology

The seeds of angiosperms develop within

A. cones. B. cotyledons. C. petals. D. ovaries.

Biology & Microbiology