Why is immersion oil often used when viewing specimens under the microscope?
A. to increase the resolution
B. to reduce the amount of heat reaching the slide from the light source
C. to stain the cells blue
D. to prevent the smear from drying out
E. to slow bacterial movement so you can see cells better
Answer: A
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What is the fate of the extra X chromosome in females?
a. Both X chromosomes are maintained normally. b. The extra X chromosome is degraded after each cell division. c. The extra X chromosome condenses. d. The extra X chromosome duplicates. e. The extra X chromosome is deleted after fertilization and is not present in the remainder of cells in the body.
The mitochondrion harnesses the energy of the flow
of __________ from its __________ compartment to its __________ compartment to generate ATP. a. CO2; outer; inner b. H+; outer; inner c. H+; inner; outer d. H2O2; outer; inner e. CO2; inner; outer
Water is most dense and thus heaviest at 4°C. At 0°C, ice forms and can float on liquid water. Suppose ice were most dense at 0°C. What would happen in a lake at this temperature?
A. Ice would not form because solids are always less dense than liquids. B. The ice would cover the bottom of the aquatic system and would build up in layers over time. C. The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules, thus causing the existing ice crystals to become disassociated from each other. D. The ice would cover the surface of the aquatic system and would never melt.
Spongiform encephalopathies are thought to be caused by
A) RNA viruses. B) DNA viruses. C) prions. D) enveloped viruses.