The walls of the descending limb of the loop of Henle are relatively permeable to sodium. Indicate whether the statement is true or false
False - water
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Alternation of heteromorphic generations
(a) is found only in the bryophytes. (b) is common to all land plants. (c) is typical of most green algae. (d) occurs in the liverworts but not mosses.
Which one of the following statements most accurately describes methylation?
A. Methyl groups are most often added to cytosines adjacent to guanine bases in or near the promoter sequence, increasing the probability of gene expression. B. Methyl groups are most often added to cytosines adjacent to guanine bases in or near the promoter sequence, decreasing the probability of gene expression. C. Methyl groups are most often added to adenine-thymine base pairs because they are held by only two hydrogen bonds, and this increases the probability of gene expression. D. Methyl groups are most often added to guanine-cytosine base pairs because they are held by three hydrogen bonds, and this decreases the probability of gene expression. E. Methyl groups are added to most bases in the promoter region of a specific gene so that RNA polymerase and its associated proteins will bind more efficiently.
In humans, the gonads ____
a. produce gametes only b. secrete hormones only c. nourish the embryo only d. produce gametes and secrete hormones only e. produce gametes, secrete hormones, and nourish the embryo
What name is given to substances that resist changes in pH?
A) buffers B) solutions C) acids D) bases