Which of the following scenarios represents a situation where a suspected disease-causing microbe would not be consistent with one or more of Koch’s postulates?
A. The microbe is found in all patients with a particular disease.
B. Some healthy individuals possess the microbe.
C. The microbe can be isolated and grown in pure culture
D. Injection of the microbe into an animal host does not produce disease symptoms.
Answer: B and D
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How do we know green light is not absorbed by chlorophyll?
A) Green light is the wavelength of light that is reflected instead of absorbed by the chloroplasts. B) Not enough of the green light penetrates the ozone layer and makes it to the plant. C) Green light has such a small wavelength that most of it goes straight through the leaves without interacting with the chlorophyll. D) Green light does not have enough energy to excite an electron in the photosystem.
Coupled transport of glucose and Na+ into the intestinal epithelial cell is an example of
a. facilitated diffusion. b. symport. c. antiport. d. endocytosis.
Why would a patient with a defect in the obese (ob) gene continue to gain weight while a patient with the normal gene would not? Assume they both eat the same diet and are the same height
What will be an ideal response?
Duffy factor is due to a chemical that occurs on the membranes of red blood cells and is sometimes used as a blood-typing attribute in the same way that ABO and Rh factor blood types are used. Recent research has found that people with Duffy factor are
about 40% less likely to be infected with HIV, given similar circumstances. Given that HIV affects white blood cells, how would you characterize the Duffy factor gene, and why? What will be an ideal response?