How can freeze-fracture be used to determine the orientation of a protein in a membrane?
A. Freeze-fracture allows a cell to be cleaved in between the lipid bilayer, splitting the plasma membrane into two layers.
B. Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope.
C. Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins.
Answer: A
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After reaching the inner ear, the frequency of a sound primarily affects
A. the amplitude of basilar membrane vibration. B. the location of the greatest basilar membrane vibration. C. the vibrational amplitude of the tectorial membrane.
As a pond starts to dry out at the end of the rainy spring season, a researcher notices that toads
burrow into the soil where they can hibernate for up to nine months. What is the benefit of hibernation?
a. reduced metabolic rate that ensures survival b. increased body temperature that ensures survival c. a period of time during which the animal completes sexual maturity d. all of these
The secretion of each of the anterior pituitary
hormones requires a. stimulation from the posterior pituitary. b. that they first be secreted from the neurons of the hypothalamus. c. two capillary beds. d. the action of minute amounts of releasing hormones. e. two capillary beds and the action of minute amounts of releasing hormones.
Which of the following statements accurately describes a role of prokaryotes in chemical recycling?
a. Photoheterotrophs convert atmospheric CO2 into organic compounds. b. Chemoautotrophs such as the soil bacterium Burkholderia glathei increase the availability of nitrogen for growing seedlings. c. Chemoheterotrophic prokaryotes may function as decomposers to return chemical elements to an ecosystem. d. Photoautotrophic bacteria living on hydrothermal vents support communities of eukaryotic species. e. All of the listed responses are correct.