Passive transport across a membrane refers to
a. transport into the interior of a cell.
b. transport out of a cell.
c. transport in the energetically favorable direction.
d. simple diffusion across membranes, without the help of proteins such as channels or carriers.
Ans: c. transport in the energetically favorable direction.
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Similar patterns of character acquisition leading to complex multicellularity are seen in plants and animals
A. true B. false
Hydrogen bonds are the result of attraction between:
a. the H of one water molecule and the H of another water molecule. b. the two H atoms of the same water molecule. c. the H and O of the same water molecule. d. the H of one water molecule and the O of another water molecule.
Refer to the accompanying table. What is the allele frequency of d?
a. 0.1 b. 0.2 c. 0.4 d. 0.5 e. 0.6
Suppose that a scientific idea is well-tested and can be used to make predictions in numerous new situations, but cannot explain one particular event. This idea is a
A) theory that may need revision. B) hypothesis that must be retested. C) hypothesis that is incorrect. D) theory that should be discarded.