The protein p53 activates genes that _____
A) increase mutation rate
B) lead to higher production of growth factors for the cell
C) increase the rate of endocytosis
D) arrest the cell cycle
Answer: D
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The 5' upstreamregions of transcriptionally active genes generally donot exhibit which of the following characteristics?
A. contain binding sites for known regulatory proteins B. relatively fewer nucleosomes C. increased in vitro sensitivity to DNase I D. increased concentration of histone H1
Plant cells build a cuticle
a. beneath the plasma membrane. b. between the plasma membrane and the primary cell wall. c. between the primary cell wall and the secondary cell wall. d. as a component of the secondary cell wall. e. at plant surfaces exposed to air.
Crossing over is one of the most important events in meiosis because
a. it produces new arrays of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. it is the mechanism through which twins are produced.
What does the middle ear consist of?
A. The ear drum B. The tympanic canal C. The vestibular canal D. Three ossicle bones E. The ear canal