Which type of plant hormone was first discovered in experiments to define the nutrient media required
for plant tissue culture?
a. gibberellins
b. cytokinins
c. salicylic acid
d. auxins
e. brassinosteroids
B
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One unique feature of fertilization in flowering plants compared with animals is that _____
A) only plant sperm are motile B) fertilization in flowering plants involves double fertilization C) fertilization in flowering plants does not involve nuclear fusion D) in flowering plants the gametes are diploid, not haploid as they are in animals
Gene inactivation is likely to produce
A. pseudogenes. B. orthologs. C. paralogs. D. homologues. E. horizontal gene transfer (HGT).
In the United States, parathion is the most widely used member of a class of ____
a. organophosphate herbicides b. organophosphate insecticides c. chlorophosphate fungicides d. chlorophosphate herbicides e. chlorophosphate insecticides
Which statement about Alzheimer's disease is true?
A) Alzheimer's disease is suspected if a patient cannot retain his or her balance. B) Alzheimer's disease is age-related, increasing in frequency as people age. C) Alzheimer's disease often reverses or improves with time. D) Alzheimer's disease frequently involves positive changes in personality.