Describe the steps involved in the functioning of the Na+/K+ pump, including the order and cellular localization of the
binding of the ions, as well how the transporter works.
What will be an ideal response?
ANSWER: First, three sodium ions in the cytosol bind to the receptor. Then, ATP is hydrolyzed in order
to change the conformation of the transporter. The sodium ions are released into the
extracellular space and two potassium ions then bind. The transporter then changes
conformation again to release the potassium ions into the cytosol before the transporter
reverts to its initial conformation.
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Membrane sterols, such as cholesterol, function in animal cell membranes to ____
a. increase the rate of diffusion b. store cellular energy c. facilitate ion transport d. maintain membrane fluidity e. receive chemical signals
In order to learn about the relationships among populations, we would need to examine the variation in DNA caused simply by ________.
A. mutation B. natural selection C. genetic drift D. geography
What is the difference between discovery science and hypothesis-driven science?
A) Discovery science "discovers" new knowledge, whereas hypothesis-driven science does not. B) Discovery science is based on deductive reasoning, whereas hypothesis-driven science is based on inductive reasoning. C) Discovery science is mostly about describing nature, whereas hypothesis-driven science tries to explain nature. D) Discovery science involves predictions about outcomes, whereas hypothesis-driven science involves tentative answers to specific questions.
Which bacterial genus feeds as a collective on other bacteria?
a. Vampirococcus b. Lysobacter c. Bdellovibrio d. Micavibrio