Which of the following is NOT a desirable characteristic of a model organism used to study development?
A. short generation time
B. small size
C. large oocytes
D. produces many offspring
E. large genome
E. large genome
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Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. An activated T cell could then destroy the thymus gland itself. C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. D. Other cell types might be accidentally activated in the thymus.
Up to 70% of travel-associated Gastrointestinal Diseases are caused by:
What will be an ideal response?
All animals, whether large or small, have _____
A) an external body surface that is dry B) a basic body plan that resembles a two-layered sac C) a body surface covered with hair to keep them warm D) most of their cells in contact with an aqueous medium
During the light reactions of photosynthesis, which of these does not occur?
A) Sunlight excites electrons in chlorophyll, allowing an electron acceptor up the energy hill to accept them. B) Water is used to regenerate the electrons in the chlorophyll that were excited by sunlight. C) Sunlight excites electrons in chlorophyll, which eventually wind up on NADPH. D) Sunlight excites electrons in chlorophyll, which are transferred directly to ATP.