________ plants bloom only when the duration of uninterrupted darkness is shorter than a critical length
A) Short-day
B) Phytochrome-system
C) Gibberellin-regulated
D) Neutral-day
E) Long-day
E
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Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?
a. The active transport of glucose b. The very fast turnover rate of glucose metabolism c. The ability of the cell to engulf glucose by pinocytosis d. The continuous excretion of glucose from other parts of the cell e. The rapid and continuous addition of phosphates onto the glucose molecules
Salt-water and fresh-water fish both maintain similar blood osmotic pressures, and NaCl concentrations, which are also similar to humans. Explain the ionic and osmotic challenges faced by salt and freshwater fish, and how they manage to homeostatically maintain blood ionic concentrations and osmotic pressures.
What will be an ideal response?
Birds that dive into the water from a height of 18 to 30 meters are called:
a. pelicans. b. albatross. c. tubenoses. d. boobies. e. puffins.
Which systems help to adjust the blood's acid-base balance?
A. muscular and skeletal B. respiratory and skeletal C. respiratory and urinary D. cardiovascular and muscular E. cardiovascular and urinary