Complement proteins can do all of the following except
A) enhance phagocytosis by innate immune cells by attaching to cell invaders.
B) help trigger the inflammatory response.
C) attack cancer and virus-infected cells after they are released by natural killer cells.
D) act as chemical signals to recruit more immune cells to the site of infection.
Answer: C
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A male who inherits an extra X chromosome will have
A. Klinefelter syndrome. B. Turner syndrome. C. Down syndrome. D. Polyploid syndrome. E. Edward syndrome.
Which taxonomic rank is least inclusive?
A. family B. genus C. order D. species
The resolution of a microscope is a function of the ________ of the lenses and the ________ of light
A) curvature, color B) curvature, wavelength C) numerical aperture, wavelength D) numerical aperture, intensity E) convex shape, intensity
What part of the sperm first contacts the egg plasma membrane?
A) the vitelline membrane B) the cortical granules C) the acrosomal membrane D) the actin proteins E) the fertilization membrane