Hormone action is associated with small quantities of hormone resulting in profound responses in
target tissues. This type of response is
a. amplification.
b. a second messenger response.
c. a gene activation response.
d. a cyclic AMP response.
e. a growth factor response.
A
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In your garden you decide to plant potatoes. You watch the above-ground development of your plant and decide to categorize the growth into four main stages:
1. The initial development of the stem and leaves (shoot) 2. The development of flowers and general growth of the shoot 3. A vegetative period where not much growth seems to be happening 4. The harvest of your potato crop (digging up the tubers formed near the base of the stem) In stage 2, which is a bigger "sink" for phloem flow? A. development of flowers B. growth of the shoot C. There is insufficient information to answer the question.
What is the significance of the production of above-ground coralloid roots by cycads that have underground stems?
A. The roots grow in waterlogged soil and they need to protrude into the air in order to respire. B. The branching of coralloid roots provides greater surface area for absorption of water. C. It keeps roots above the ground where they cannot be attacked by parasitic nematodes. D. The roots have mutualistic photosynthetic cyanobacteria that fix nitrogen for the cycad and the cyanobacteria can only survive if they are above ground where they are exposed to light. E. The soil in which cycads live has a low pH that would kill the roots if they were completely below ground.
In a fish population in a shallow stream, the genotypic frequency of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. This change in genotypic frequency is most likely attributable to
a) gene flow b) disruptive selection c) directional selection d) genetic drift e) natural selection
Which of the following best distinguishes rough ER and smooth ER?