The catalytic center of the E. coli RNA polymerase includes the subunit(s)
a. ?I and ?II
b. ? and ??
c. ? and ?
d. ?
e. ?
Ans: b
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Which of the following constitute the vestibular apparatus?
A. saccule and utricle only B. semicircular canals, saccule, and utricle C. ampullae of Lorenzini D. saccule, utricle, and Organ of Corti E. saccule, utricle, and ventricle
An X-linked recessive gene (c) produces red-green color blindness. A normal woman whose father
was color blind marries a color-blind man. (a) What are the possible genotypes for the mother of the color-blind man? (b) What are the possible genotypes for the father of the color-blind man? (c) What are the chances that the first son will be color blind? (d) What are the chances that the first daughter will be color blind? What will be an ideal response?
In addition to highly repetitive and unique DNA sequences, a third category of DNA sequences exists. What is it called, and which types of elements are involved in it?
A) dominant DNA; euchromatin and heterochromatin B) multiple gene family DNA; hemoglobin and 5.0S RNA C) permissive DNA; centromeres and heterochromatin D) moderately repetitive DNA; SINEs, LINEs, and VNTRs E) composite DNA; telomeres and heterochromatin
Two populations of cells may end up segregating themselves into different layers during development because they have different:
A) phospholipid molecules. B) cell adhesion molecules. C) sizes. D) DNA. E) apoptosis programming.