Animals with eight rows of comb plates are called:
a. jellyfish.
b. seastars.
c. ctenophores.
d. polycheates.
e. octocorals.
C
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. triggers the release of a second messenger which leads to the hydrolysis of glycogen to glucose b. triggers the release of a second messenger which lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
Meiosis I results directly in the production of
a. spermatids. b. spermatogonia. c. primary spermatocytes. d. secondary spermatocytes. e. sperm.
Which of the following pairs is incorrectly matched for cells and the molecules they secrete?
A. Mast cells; histamine B. Natural killer cells; toxic chemicals C. Eosinophils; toxic chemicals D. Neutrophils; heparin E. Basophils; heparin
Most of the oxygen in the blood is transported by ____.
A. erythropoietin B. prothrombin C. platelets D. hemoglobin E. leukocytes