Which type of cell signaling does not rely on the diffusion of a chemical signal molecule?
A. juxtacrine
B. paracrine
C. autocrine
D. endocrine
E. All of these choices are correct.
A
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One of the most important roles of proteoglycans is to trap ________.
Fill in the blank(s) with the appropriate word(s).
The fastest land animal is the cheetah, which can run about 70mph. The fact that its main prey species, the Thomson's gazelles can run about 50 mph, which is also very fast, is likely the result of ____
a. character displacement b. disruptive selection c. interference competition d. predator-prey coevolution e. mimicry
Which gland shrinks in size during adulthood, and has hormones that function in maturation of T-lymphocytes?
A. tonsils B. lymph nodes C. spleen D. galt E. thymus
Anna is conducting an experiment using a pH indicator that is red at low pH, green at neutral pH and purple at high pH. She starts with a green solution. When she adds compound X to her solution it turns purple. Then she adds compound Z to the solution and it turns green. She adds more Z, the solution remains green. These observations suggest X is ________ and Z is ________.
A. a base; a buffer B. an acid; a base C. a base; a strong acid D. an acid; a buffer E. a buffer; a base