Which specialized stem structure does not store nutrients?

a. bulbs
b. corms
c. tubers
d. rhizomes
e. stolons


e

Biology & Microbiology

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Transcriptional regulators bind most frequently at the ________ site of DNA

A) major groove B) minor groove C) histone complex D) primary supercoil

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The "lub" heart sound represents ____

a. a heart murmur b. closure of the atrioventricular valves c. closure of the semilunar valves

d. hypertension e. movement of actual heart muscle

Biology & Microbiology

In the mechanism of action of a proton pump, the role of ATP is to:

a. cause a proton to bind to a carbohydrate. b. cause a cell to take up protons by endocytosis. c. cause a cell to release protons by exocytosis. d. transfer protons to the inside of a cell. e. transfer protons to the outside of a cell.

Biology & Microbiology

Control of the lac operon and lactose utilization in bacteria is (check all that apply)

A. controlled by the expression of three downstream genes. B. not induced in the presence of both glucose and lactose. C. only induced when there is glucose but not lactose. D. preferentially utilizing lactose as a carbon source. E. is a negative control, mediated by a repressor.

Biology & Microbiology