Which is NOT true about protein kinases?
A. They add phosphate groups to proteins.
B. They produce effects similar to allosteric modulation.
C. They perform the opposite function as phosphatases.
D. They use ATP to carry out their reactions.
E. They remove phosphate groups from proteins.
E
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Fluid return to a capillary bed is driven by plasma colloid osmotic pressure
Indicate whether the statement is true or false
Local passive current flow decreases with distance because
a. ion pumps which drive current flow run out of energy (ATP) as they drift from the stimulus site. b. current leakage across the membrane attenuates current available for intracellular current flow. c. as it gets away from the active zone, the membrane fluidity decreases and prevents influx of booster current. d. of all of these reasons. e. of none of these reasons.
Which step of cellular respiration produces the most ATP?
A. Citric acid cycle B. Glycolysis C. Hydrolysis D. Electron transport chain
The placenta is
A. a site where fetal blood can enter the maternal circulation. B. a site where maternal blood enters the fetal circulation. C. formed from maternal circulatory stem cells, and serves as an exchange organ between mother and fetus. D. a site formed by the proliferation of the maternal endometrium and myometrium. E. a site of diffusion and transport of wastes, oxygen, and nutrients between fetal and maternal blood.