When you view a close object your lens gets _____
a. flatter c. darker
b. rounder d. cloudier
B
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Answer the following statements true (T) or false (F)
1. When autocrine stimulation is occurring, cancer cells divide in response to growth signals produced by the surrounding noncancerous cells 2. Genomic instability in cancer cells includes both nucleotide mutations and chromosomal aberrations. 3. If cancer does not develop within one year following exposure to a mutagen, then the mutagen did not cause DNA damage. 4.If a female is heterozygous for a mutant allele of a tumor-suppressor gene, her children will be predisposed to develop cancer only if their father is also a carrier. 5. This population is in Hardy-Weinberg equilibrium.
What type of bond links two polynucleotide chains to each other in a double helix DNA?
A.) glycosidic bond B.) hydrogen C.) phosphodiester D.) phosphoanhydride E.) disulfide
Why does immersion oil improve resolution?
A) It allows light to travel at a uniform speed on its way to the lens. B) It decreases the working distance. C) It increases the numerical aperture. D) It increases numerical aperture and maintains a uniform light speed. E) It increases the angle of refraction of the light.
Nitrates and nitrites are used in cured meats mainly to prevent
A. staphylococcal enteritis. B. Vibrio enteritis. C. botulism. D. listeriosis. E. shigellosis.