Which of the following statements about allosteric proteins is/are true?
a. they are sensitive to environmental conditions
b. they are acted on by inhibitors
c. they exist in active and inactive conformations
d. all of the above are correct
e. none of the above are correct
Answer: d. all of the above are correct
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In two of Koch's postulates (#2 and #3), a pure culture of the organism is required. Which of the following would NOT be a possible consequence of using a contaminated culture?
A. You can't necessarily attribute the illness directly to the microbe in question-it may in fact be caused by the contaminating microbe. B. There's the possibility that the test animal might be acutely susceptible to the contaminating microbe, but completely resistant to the microbe you suspect causes the illness of interest. As such, when you introduce it into the test animal, it could confuse your final results. C. The problem is that one microbe may be toxic to the other. It may have killed all of your suspect microbe in the culture. Therefore, you can't be sure that you're infecting your test animals with the microbe you suspect is causing the illness, or if it's only the second (contaminating) microbe. D. Even though there's a contaminating microbe present, so long as the original suspect microbe is also present, the disease should still manifest in test animals. It should also still be recoverable from test animals following infection. As such, there's really no consequence to using a contaminated culture.
An example of a beneficial mutation is
A) a mutation in collagen that causes the skin to be extra stretchy. B) the mutation that causes sickle cell disease. C) a mutation in the CCR5 gene. D) a mutation in a cytokine gene that causes an allergy.
Each human kidney contains about a million ______________, which are the tubular functional units of the kidney.
A. ureters B. nephrons C. nephridia D. flame cells E. renal medullae
How many ATP molecules (net yield) are produced per molecule of glucose during glycolysis?
a. 1 b. 2 c. 4 d. 36 e. 38