Phosphate fertilizers have increased the amount of phosphate in lakes and other bodies of water. What effect does this increase have on the phytoplankton in the water?
A) It increases their likelihood of being eaten.
B) It stimulates their growth.
C) It causes them to form toxic compounds.
D) It reduces their photosynthetic capacity.
E) It kills them.
B
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Following a meal glucose must move from the gut lumen where there is a high glucose concentration into the intestinal cell where there is a relatively low level of glucose. This movement is called
A. passive diffusion. B. facilitated diffusion. C. active transport. D. endocytosis. E. exocytosis.
A C4 plant minimizes photorespiration by
A. stomata that are only opened at night, storing carbon dioxide in malate, and releasing carbon dioxide during the day. B. having the light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco. C. having the light reactions and carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco. D. stomata that are only opened at night, storing oxygen in malate, and releasing oxygen during the day.
Explain the cohesion-tension theory. What will be an ideal response?
Which of the following is not true of
mitochondria? a. They have DNA. b. Their DNA can experience mutations. c. In animals the mitochondria come from the mother. d. They undergo genetic recombination during fertilization. e. All these are true