Movement of a molecule against a concentration
gradient is
a. simple diffusion.
b. facilitated diffusion.
c. osmosis.
d. active transport.
e. bulk flow.
Answer: d
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In a given mapping experiment, you expect that incidence of double crossovers is 3.5%, but you only observe 2.5%. This can be explained by ________________
A. Interference B. Linkage C. Coincidence D. Segregation
This simple plant tissue has elongated cells,
living cells with unevenly thick cell walls that function in support. This plant tissue is
a. parenchyma. b. sclerenchyma. c. collenchyma. d. xylem. e. phloem.
In some G-protein-coupled-receptors, cyclic AMP (cAMP) acts as a(n)
1.first messenger. 2.second messenger. 3.effector. 4.protein kinase. 5.extracellular signal.
The living, or ________, and nonliving, or ________, components of the environment interact within an ecosystem
Fill in the blank(s) with correct word