The source region in the pressure flow
explanation of phloem transport is most often
the
a. root.
b. flower.
c. stem.
d. leaf.
e. soil.
D
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The morning-after pill works by ____
a. blocking ovulation or fertilization b. blocking passage of sperm through the female reproductive tract c. blocking passage of sperm through the male reproductive tract d. causing shedding of the endometrial lining and any implanted embryo e. increasing the effectiveness of the acrosomal reaction
After years of listening to loud music on headphones, the cilia on Bob's hair cells are damaged. What is the result?
Hair cells are delicate sensors of sound, movement, and gravity. Since they are stimulated by movement of the stereocilia and kinocilium, these structures are vulnerable to damage when stimulus is too strong or sustained. A. vestibular problems B. hearing loss C. vision problems D. taste hallucinations
Which scenario illustrates directional selection?
a. Elk that are smaller or larger than average are easier prey for predators than elk of approximately average size. b. Bright feathers allow birds to attract mates, dull feathers hide birds from predators, but semi-bright feathers convey no advantage. c. Rabbits with shorter ears become more common where cattle that favor grazing on taller grass over shorter grass are introduced. d. Wildlife living in a forest are displaced after a wildfire destroys their natural habitat.
A heterozygous fruit fly with normal wings and a gray body (VvBb) is crossed with homozygous flies with vestigial
wings and black bodies (vvbb). If there are 800 F1 progeny, the expected phenotypes would be: a. 200 normal gray, 200 normal black, 200 vestigial gray, and 200 vestigial black b. 400 normal gray and 400 vestigial black c. 800 normal gray
d. 800 vestigial black e. 450 normal gray, 150 normal black, 150 vestigial gray, and 50 vestigial black