Proteins are made at the
A. nucleolus.
B. ribosome.
C. Golgi apparatus.
D. grana.
B. ribosome.
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Loading of most carbohydrates produced by photosynthesis into companion cells at a source occurs by
a. osmosis. b. proton pumping. c. suction from unloading at a sink. d. active transport. e. diffusion of water from the xylem.
As a general principle of gene regulation through operons, regulatory genes encode
A) trans-acting proteins that interact with cis-acting DNA elements. B) cis-acting proteins that interact with cis-acting DNA elements. C) cis-acting proteins that interact with trans-acting DNA elements. D) trans-acting proteins that interact with trans-acting DNA elements.
In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a zygote; the other
fuses with the endosperm mother cell and gives rise to __________. Fill in the blank(s) with the appropriate word(s).
The frequency of homozygous dominant individuals in a population that is in Hardy-Weinberg equilibrium is equal to
A) q or p. B) p2. C) 2pq. D) 2p.