When Thomas Hunt Morgan began studying white-eyed fruit flies, the first observation he made that departed from the results he expected based on Mendelian principles was that:
A. the offspring of a white-eyed male and
wildtype (red-eyed) female all had red eyes.
B. white eyes reappeared in his second
generation crosses (matings between
brothers and sisters produced from the first
cross).
C. white eyes appeared only in males.
D. white eyes appeared only in females.
E. white eyes appeared in both males and
females.
C
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Why is it that the tongue and cheek epithelium doesn't provide a sufficient anaerobic environment for plaque anaerobes to grow, but the surface of teeth might?
A. The epithelium is supplied with oxygen by capillary beds. This makes it a relatively aerobic environment and hostile to anaerobes. B. The tooth enamel is supplied with oxygen by capillary beds. This makes it a relatively anaerobic environment and hostile to aerobes. C. The surface of the tongue and cheek are constantly scraped by the action of consuming food. Layers of bacterial growth that might help to supply an anaerobic environment are scraped away, exposing lower levels to oxygen-rich air. D. The surface of teeth (especially the molars) have many pits and crevices that can serve as 'pockets' for layers of bacteria to grow in. Once the layers get deep enough, the bottom portions are anaerobic. This isn't possible on the very smooth surface of the tongue and cheek epithelium.
Dana Reeve, the wife of actor Christopher Reeve, died at a young age from lung cancer, although she had never smoked. Her cancer was likely caused by
A) a germline mutation. B) two somatic mutations in the same lung cell. C) exposure to carcinogens. D) stress from caring for her husband, who had a spinal cord injury.
How do hydrophobic molecules interact with water?
a. attracted to b. absorbed by c. repelled by d. mixed with e. polarized bond
New genetic combinations result from
a. crossing over. b. sexual reproduction. c. mutations. d. exchange of genes between different species. e. all of these