What is the function of tight junctions?
a. to seal the spaces between cells
b. to give the cell its shape
c. to allow ions and small molecules to pass between cells
d. to allow cells to communicate with each other
Answer: a. to seal the spaces between cells
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What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They are all linked to protein kinase activation. B. They associate with protein bound to guanidine phosphates. C. They open ion channels. D. They bind similar hormones. E. They change their conformation when bound to a hormone.
A population of mostly ____ individuals with a ____ generation time and a ____ proportion of females is expected to
show the most growth in the future.
a. prereproductive; short; high b. reproductive; short; low c. reproductive; long; low d. postreproductive; long; low e. prereproductive; short; low
How many different amino acids could be encoded by the synthetic mRNA sequence 5' UGCUGCUGC 3'?
A) 0 B) 1 C) 2 D) 3 E) 6
Using the illustration below and the assumption that
half of a plant’s sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is a. 1/2 x 1/2. b. 25 percent. c. one out of four. d. 1/2. e. all of these EXCEPT 1/2.