The contacts between the DNA and the histones of the nucleosome are:
A. mainly between the R groups of the histones and the phosphate backbone of the DNA.
B. mainly between the conserved histone folds and the bases that are exposed in the major groove of the DNA.
C. mainly between the conserved histone folds and the bases that are exposed in the minor groove of the DNA.
D. more prevalent in regions of the DNA that have tracts of G?C base pairs.
E. primarily between the DNA and the histone peptide backbone.
E
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Which of the following statements is NOT true?
a. Natural selection is based upon differential reproduction and survival. b. For evolution to occur in a population, there must be some variation. c. Most mutations have beneficial effects on traits. d. A population evolves when heritable change occurs in a line of descent. e. Over time, some genetic traits are more adaptive than others.
Where is thyrotropin-releasing hormone (TRH) made?
A) anterior pituitary B) posterior pituitary C) follicular cells of the thyroid gland D) hypothalamus
Net primary productivity refers to all the energy in the plants and animals in a food chain at any particular time
Indicate whether the statement is true or false
What is the process in which impulses jump from node to node?
A. Incomplete transfer B. Saltatory conduction C. Repolarization D. Refractory action E. Facilitated transmission