In a maple forest in the spring, the ground is often covered with young maple seedlings, which compete for light and nutrients. By fall, most of the seedlings have died, leaving only a few survivors
This is an example of ________ life history pattern.
Fill in the blank(s) with correct word
early-loss
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Kohler and Lipton first discovered a growth factor (PDGF) by:
A. observing that fibroblasts could not grow in cell culture without adding PDGF to the growth medium. B. observing that fibroblasts could not grow in cell culture without adding bovine blood serum to the growth medium. C. observing that fibroblasts grew better in cell culture when blood serum was added to the growth medium instead of blood plasma. D. observing that fibroblasts could not grow and repair wounding without the action of platelets. E. observing that fibroblasts could not grow in cell culture without the addition of purified red blood cells.
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are produced by the
A. pancreas. B. anterior pituitary gland. C. pineal gland. D. hypothalamus. E. posterior pituitary gland.
Functions of the mantle in clams include
a. secreting the shell. b. forming pearls around irritating grains of sand. c. forming the incurrent and excurrent siphons. d. all of the above.
In what disease do the larvae cause pulmonary symptoms?
a) Hookworms b) Ascariasis c) Trichinellosis d) Pinworms