In the life cycle of bryophytes and seedless vascular plants, meiosis takes place in the
a. gametophyte.
b. sporangium.
c. archegonium.
d. zygote.
e. antheridium.
B
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In the Northern Hemisphere, seasonal variation in temperatures is caused mainly by ____
a. the Earth's elliptical orbit taking it closer to and farther away from the sun b. the Earth's tilt on its axis of 23.5? c. seasonal variation of output of energy from the sun d. warm equatorial air masses rising and spreading north and south e. uneven warming of the ocean's surface water
Buchnera aphidicola provides ________ to its aphid host that are essential to the survival of the insect.
A. amino acids B. cellulases C. vitamins D. carbohydrates
The bacterial A-B toxins often consist of a two-chain molecule. The 'B chain' promotes entry of the bacteria into cells, and the 'A chain' has inhibitory activity against some vital function.
a. true b. false
Which of the following regarding all of the tapeworms that infect humans is TRUE?
A) They all have non-human intermediate hosts. B) The larva can directly infect humans upon contact with skin. C) Humans are the normal intermediate hosts. D) They are transmitted by insect vectors. E) They reside in the muscle tissue of the definitive host.