Which of the following events is one of the three main stages of coagulation?
A. Platelet plug formation
B. Conversion of thrombin to prothrombin
C. Conversion of fibrinogen to fibrin
D. Calcium release
E. Platelet aggregation
Answer: C
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Among vertebrates, taste buds share certain common features. Which of the following is FALSE?
A) They are onion shaped. B) They have a pore that opens out to the surface of the body. C) They have numerous microvilli on the apical surface. D) They are single neurons.
Match the following concerning concentration differences across the plasma membrane.A. Concentration of K+B. Concentration of Na+ and Cl?C. Negatively charged proteinsD. Sodium-potassium pumpE. Plasma membrane is more permeable to this ion because of leak ion channelsK+
Fill in the blank(s) with the appropriate word(s).
More than one sperm is prevented from fertilizing an egg by all of the following mechanisms except:
A. Opening sodium channels in the plasma membrane causes a change in the electrical charge of the membrane. B. Secretion of material from cortical granules pushes sperm away from the already fertilized egg. C. A slow block to polyspermy occurs. D. Meiosis II is completed by the egg. E. A fast block to polyspermy occurs.
Most absorption takes place in which part of the small intestine?
A. Ileum B. Duodenum C. Jejunum D. Absorption happens equally throughout the small intestine.