A(n) ____ is created as ions diffuse across membranes
a. chemical gradient
b. electrochemical gradient
c. negative gradient
d. electrical gradient
e. concentration gradient
B
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Once a pollen tube lands on a compatible stigma ____
a. chemical cues guide the pollen tube from the stigma to the embryo sac of an ovule b. that pollen tube continues on to another ovule c. other pollen tubes are attracted to that ovule d. other pollen tubes can penetrate that ovule more easily
e. the flower dies to prevent further pollinationThe part of a mollusc's body that is responsible for secreting a shell is the: a. mantle
b. nephridium. c. head-foot region. d. visceral.
Biotechnology products produced by bacteria include all of the following EXCEPT
A. insulin. B. antibodies to deliver radioisotopes to tumor cells. C. clotting factor VIII. D. human growth hormone.
Antibody response that occurs upon the first exposure to an antigen
A. Primary Response B. IgM C. Secondary Response D. IgG E. Latent Period F. 1st Exposure G. 2nd Exposure