. If growers want fruit to drop from trees simultaneously they might apply:
A. auxins
B. ethylene
C. abscisic acid
D. gibberellins
E. brassinosteroids
A. auxins
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Selection pressures acting on a population may favor
a. individuals at the left end of the range of variation. b. individuals at the right end of the range. c. extreme individuals at both ends of the range. d. the intermediate individuals within the range. e. all of these.
The term referring to the rate at which organisms produce offspring is:
a. doubling time. b. natality. c. emigration. d. stasis. e. survivorship.
Why is apoptosis potentially threatening to the healthy "neighbors" of a dying cell?
A) Cell death would usually spread from one cell to the next via paracrine signals. B) Lysosomal enzymes exiting the dying cell would damage surrounding cells. C) Bits of membrane from the dying cell could merge with neighboring cells and bring in foreign receptors. D) Neighboring cells would activate immunological responses.
Match the following terms with the correct definition
1. Portion of the antigen recognized by the immune system 2. Foreign molecules that are too small to elicit an immune response 3. These foreign materials elicit allergic responses 4. Antigen Binding site a. Haptens b. Epitope c. Allergen d. Paratope