What do enzyme-linked receptors and growth factor receptors have in common?
A. Both regulate specific G proteins when bound to a hormone.
B. Both regulate the transport of ions through channels.
C. Both seldom affect the expression of genes within the nucleus.
D. Both possess kinase activity when bound to a hormone.
E. Both act as transcriptional factors.
Answer: D
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What are the two main groups of green algae?
A) chlorophytes and chrysophytes B) chlorophytes and charophyceans C) chrysophytes and charophyceans D) chlorarachniophytes and chlorophytes
How many types of differentiated cells are found in the human body?
a. 15 b. 68 c. 200 d. 180 e. 155
Which of the following would be the most likely reason for high resistance of capillaries to blood flow?
a. the diameter of capillaries being so small that the white blood cells must squeeze b. the diameter of capillaries being so small that that the red blood cells must squeeze c. the diameter of capillaries being so large that the red blood cells must fill it all up d. the diameter of capillaries being so large that the white blood cells must fill it all up
Homophilic interactions between cells involve interactions
a. among adhesion molecules of the same molecular class. b. among adhesion molecules of different molecular classes. c. between integrins and ICAMs. d. between cadherins and -catenin.