A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as
A. osmosis.
B. diffusion.
C. facilitated transport.
D. active transport.
E. exocytosis.
D. active transport.
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The _________ from Agrobacterium tumefaciens is used in genetic engineering involving crop plant genes.
A. restriction endonucleases B. DNA C. Ti vector D. Ti plasmid
Monoglycerides and fatty acids diffuse into a brush border cell, where they form triglycerides and combine with
proteins to form __________. Fill in the blank(s) with the appropriate word(s).
Zero population growth is achieved when ____
a. a population reaches the carrying capacity of the environment b. emigration and immigration are balanced, and the number of births equals the number of deaths c. births exceed deaths d. deaths exceed births e. emigration and immigration are prevented
The second most common cancer in both men and woman is cancer of the ____
a. blood b. skin c. colon d. lung e. pancreas