Some of the olfactory receptor (OR) genes in humans
A. have been inactivated, reducing our olfactory capabilities compared to other primates.
B. have been conserved more rigidly, resulting in increased orthologs compared to other primates.
C. have duplicated more frequently, resulting in increased paralogs compared to other primates.
D. have been activated, enhancing our olfactory sense compared to other primates.
Answer: A
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A base
A. is a chemical that adds hydrogen ions to a solution. B. has a value below 7 on the pH scale. C. is a chemical that absorbs hydrogen ions from a solution. D. has a value of 7 on the pH scale. E. All the answer choices are correct.
This simple plant tissue consists of dead cells
with thick, lignified cell walls that function in support. This plant tissue is
a. parenchyma. b. sclerenchyma. c. collenchyma. d. xylem. e. phloem
What is the role of opsonins?
a. They attract phagocytes to the location of infection. b. They create "handles" that make it easier for the pseudopods of phagocytes to attach to the microbe invader. c. They aid in the formation of the phagolysosome. d. They are present on the surface of phagocytes.
A section of lung from a patient with sputum cultures positive for acid-fast organisms is negative when stained with the Ziehl-Neelsen stain. To confirm that no organisms are present in the lung tissue, it would be best to stain new sections with:
a) auramine-rhodamine b) Giemsa c) Gram d) Dieterle