Treated sewage released into the ocean adds large amounts of ____ into the water
a. bacteria
b. DDT
c. PCBs
d. chlorine
e. zinc
D
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A mutation in the human gene for a fibroblast growth factor receptor (FGFR) appears to be responsible
for ____.
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
If a tumor suppressor gene becomes mutated, which of the following is not true?
A. Genes that inhibit the cell cycle are not turned on. B. The cell cycle continues when it should not. C. Apoptosis is less likely to occur. D. Genes that encode enzymes that repair DNA are not turned on. E. A "gain-of function" mutation has occurred.
A Coulter counter is:
a. a statistical estimation using 15 dilution tubes and a table of numbers to estimate the number of bacteria per mL b. an indirect method of counting organisms c. a device that directly counts microbes as they pass through a tube in front of an electronic detector d. a device that directly counts microbes that are differentially stained with fluorescent dyes
Stage 1 of oxidative phosphorylation requires the movement of electrons along the electron-transport chain coupled to the pumping of protons into the intermembrane space. What is the final result of these electron transfers?
(a) OH– is oxidized to O2 (b) pyruvate is oxidized to CO2 (c) O2 is reduced to H2O (d) H– is converted to H2