Which of the following can pass through gap junctions?

a. cAMP and calcium ions
b. Insulin and calcium ions
c. cAMP and glucose
d. Insulin and glucose


Ans: a. cAMP and calcium ions

Biology & Microbiology

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Why is cancer more prevalent in older individuals?

a. Cancer cells form at a faster rate. b. More mutations develop with age. c. The protective action of cytotoxic T cells breaks down with age. d. Cancers learn to disguise themselves as "self" with time. e. Older people tend to be exposed to more dangerous chemicals.

Biology & Microbiology

Oligodendrocytes are similar to Schwann cells in that they

A) are a type of neuroglial cell. B) are located in the central nervous system. C) conduct nerve impulses. D) help neurons regenerate after injury. E) are located in the peripheral nervous system.

Biology & Microbiology

Which event illustrates evaporative cooling?

a. a tea kettle whistling b. sweat evaporating from the skin c. ice cubes floating in a glass of water d. a fish not freezing in a pond covered with ice e. salt dissolving in a pot of water full of potatoes

Biology & Microbiology

Plasmids that have genes for pili and can transfer copies of themselves to other bacteria during conjugation are called ________ plasmids.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology