In skeletal muscle contraction, when____binds to Ca2+, itundergoes a conformational change that allowstropomyosin
to move to the grooves in the actin double helix.
a. troponin
b. myosin
c. phosphate ions
d. ATP
e. acetylcholine
ANSWER: a
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Argentine fire ants entered the United States in
the a. 1920s. b. 1930s. c. 1940s. d. 1950s. e. 1960s.
Which of the following is false about human
kidneys? a. Each has more than one million nephrons. b. They filter about 180 liters of fluid from the blood every day. c. An individual can live a normal life even if one kidney is nonfunctional or surgically removed. d. Two sets of blood capillaries are associated with each nephron. e. None of these are false.
A flower that lacked both petals and stamens would be
a. complete b. incomplete c. perfect d. imperfect e. both b and d
Which of the following are phagocytic cells found in the epidermis?
A) neutrophils B) natural killer lymphocytes C) microglia D) dendritic cells E) wandering macrophages