Root hairs absorb nutrients from soil against the nutrient concentration gradient. To achieve this, root hairs use _____.
A. proton pumps
B. facilitated diffusion
C. direct diffusion
D. osmosis
Answer: A. proton pumps
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Which vessel of the human body can serve as a
blood reservoir?
a. vein b. venule c. capillary d. arteriole e. artery
Rosalind Franklin was the first scientist to
work with a. the "wet" form of DNA. b. dehydrated DNA. c. DNA from eukaryotic cells. d. X-rays in biological research. e. and learn from Watson and Crick.
Sodium-potassium pump:
a. reestablishes the gradient of sodium and potassium b. releases neurotransmitters c. pumps sodium into the cell and potassium out of the cell d. transmits the action potential
Green algae are assumed to be ancestors of plants because
A) green algae are almost exclusively marine. B) green algae make chitin and laminarin. C) the fossil ancestors have been discovered. D) lignin is known to occur in some green algae. E) green algae make cellulose and starch.