The function of fruit is to ________
a. provide food for the embryo sporophyte
b. attract pollinators
c. provide food for the seedling after germination
d. attract animals to disperse seeds
d
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The lobster mushroom results when a fungus acts as a parasite to
a. cow dung. b. a fungus. c. plants. d. skin
Answer the following statements true (T) or false (F)
1. Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics of natural origin. These antibiotics should also be effective in killing Streptomyces. 2. Streptomyces are obligate aerobic soil bacteria that infect many plant roots, causing scabs on their leaves. You would expect to find more Streptomyces near the surface of the soil. 3. Antibiotics usually are not dangerous to use in treating bacterial infections because most antibiotics exploit structures and functions in bacteria that are not present in host cells. 4. Pili are bacterial structures used primarily for motility. 5. Autotrophs must acquire carbon from organic molecules produced from other organisms.
Which of the following is eliminated in rapidly dividing embryonic cells that get smaller with each cell division?
A) G1 phase B) S phase C) G2 phase D) M-phase chromosome separation E) M-phase cytokinesis
Two mammals, a sheep and a goat, produce offspring. Only the F1 and F2 generations produce fertile offspring. This
occurs as a result of: a. mutation. b. hybrid sterility. c. microevolution. d. hybrid inviability. e. hybrid breakdown