Which of the following is true of gene regulation?
1.Different genes are present in different tissues, leading to differentiation.
2.Operons are made up of promoters, enhancers, and exons.
3.In prokaryotes, gene regulation is predominantly a response to environmental conditions.
4.Histones bind to promoter regions of genes and act to inhibit methylation.
3
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What is the name of the enzyme that adds CCA to the 3' end of tRNAs?
A. tRNA nucleotidyltransferase B. Aminoacyl-tRNA synthetase C. RNA polymerase D. Peptidyl transferase
Molecules that stimulate T cells to proliferate nonspecifically, causing the release of massive quantities of cytokines, which, in turn, can lead to tissue damage are called ________.
Fill in the blank(s) with the appropriate word(s).
The arrangement of organisms into taxa
A) shows degrees of relatedness between organisms. B) shows relationships to common ancestors. C) was designed by Charles Darwin. D) is arbitrary. E) is based on evolution.
In the mouse, gene A allows pigmentation to be deposited in the individual coat hairs; its allele a prevents such deposition of pigment, resulting in an albino. Gene B gives agouti (wild-type fur); its allele b gives black fur. What would the expected
ratio of the progeny be in a cross of a doubly heterozygous agouti mouse mated with a doubly homozygous recessive white mouse? A) 9 (agouti) :3 (black) : 4 (albino) B) 9 (black) : 27(albino) C) 1 (agouti) :1 (black) : 2 (albino) D) 3 (agouti) :4 (black) : 9 (albino) E) 1 (agouti) :1 (black) :1 (albino)