The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids
B. carbohydrates
C. inorganic compounds
D. methane gas and alcohols
Answer: C
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A wheat farmer is concerned that his land has been depleted of nitrogen. What steps can he take to make sure his wheat crops have enough nitrogen for the next season? Select all correct choices
A. He can plant alfalfa on his land and let it serve as "green manure." B. He can treat his land with man-made fertilizers, thanks to Haber and Bosch. C. He can continue to plant his wheat crops, as wheat can form root nodules. D. He can treat his land with phosphate fertilizers.
In lichens, the fungi send projections of their hyphae across the algal cell wall in order to obtain nutrients from the photosynthetic partner. These projections are called
A. hyphal extensions. B. lichenthropes. C. haustoria. D. mycelia.
A cytotoxic T lymphocyte, having been activated against a particular viral antigen, "sees" this same antigen displayed on the surface of a host cell. What will happen?
A. The cytotoxic body cell will activate B cells which then produce antibody against the antigen. B. The cytotoxic T cell will produce proteins that cause the host body cell to die. C. The cytotoxic T cell will produce antibodies against the antigen. D. The antigen will move inside of the host body cell, thereby hiding from the cytotoxic T cell.
The last part of the metamorphosis of a tadpole to an adult frog results in the disappearance of the tail. This stage of development most likely occurs by
(A) cells of the tail dying and the nutrients being absorbed and reused by the body (B) shedding of the tail so energy is not spent on maintenance of an unneeded part (C) bilateral division of the tail and fusion with the developing hind limbs (D) individual cells of the tail migrating to the developing gonads