Most Devonian osteolepiforms had strong, stout fins that enabled them to crawl on the muddy bottom of shallow
pools.
a. True
b. False
ANSWER: True
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Match the second messenger on the left with the properties on the right.
A) activates protein kinase C B) opens sensory-associated ion channels C) can bind calmodulin D) glucose mobilization E) opens calcium channels 1) cAMP 2) IP3 3) DAG 4) calcium 5) cGMP
____ are responsible for separating
chromosomes during cell division.
a. Microfilaments. b. Intermediate filaments. c. Actin filaments d. Microtubules e. Microfibers
Which cells complete their maturation in the thymus gland?
a. T cytotoxic cells only b. T helper cells only c. B cells only d. Both T cytotoxic and T helper cells e. T cytotoxic cells, T helper cells, and B cells
The lowest temperature at which a microbe continues to metabolize is called its ____.
Fill in the blank(s) with the appropriate word(s).