When complexing with histones, the DNA phosphodiester backbone is in close proximity to:
A. the histone fold, two ? helices connected by two short links, this motif being found within H1, H2A, H2B, H3, and H4
B. the histone fold, two ? helices connected by two short links, this motif being found within H2A, H2B, H3, and H4
C. the histone fold, three ? helices connected by two short links, this motif being found within H1, H2A, H2B, H3, and H4
D. the histone fold, three ? helices connected by two short links, this motif being found within H2A, H2B, H3, and H4
D
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Which of the following chemicals has the LEAST influence on the regulation of breathing rate?
a. O2. b. CO2. c. H+. d. N2. e. CO.
Identifying candidates for a disease gene by positional cloning depends on distinguishing DNA markers that are close to the disease gene from markers that are far away. When the disease gene is close to a marker, there will be
A) a high number of mutations in the intervening DNA. B) a low rate of recombination between the disease gene and the marker. C) many alleles at the marker locus. D) a high chance of locus heterogeneity.
The plasma membranes of root hair cells contain a variety of protein transport channels through which specific ions are transported, even against large concentration gradients, by
A. carbohydrate pumps. B. water pumps. C. hydrogen ion pumps. D. root pumps. E. electron pumps.
Enzymes that are expressed at a constant level all the time are said to be ________.
A. constitutive B. repressible C. attenuated D. inducible