The complement cascade and its by-products contribute to
A) attracting phagocytes to sites of infection.
B) triggering inflammation.
C) triggering release of interferons.
D) triggering inflammation and release of interferons.
E) both triggering inflammation and attracting phagocytes to sites of infection.
E
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Hemophilia in humans results from an X linked recessive gene. Which of these statements regarding the inheritance of this trait is true?
A. Heterozygous females will exhibit a milder form of hemophilia. B. All daughters of an affected mother will have hemophilia. C. Carrier females will always pass the hemophilia allele to their sons. D. Males who inherit the recessive allele from their fathers will exhibit hemophilia. E. All sons of an affected mother will have hemophilia.
The sodium-potassium pump is an example of
a. simple diffusion. b. facilitated diffusion. c. osmosis. d. active transport. e. bulk flow.
Which of the following statements regarding the Watson–Crick model of DNA is false?
A) It is the most common biological form of DNA. B) The two DNA strands form a left-handed helix. C) The two DNA strands are antiparallel. D) The bases are "stacked" in the center of the molecule. E) The backbone consists of alternating sugars and phosphates.
In extremely cold regions, woody species may survive freezing temperatures by _____
A) emptying water from the vacuoles to prevent freezing B) decreasing the numbers of phospholipids in cell membranes C) decreasing the fluidity of all cellular membranes D) increasing cytoplasmic levels of specific solute concentrations, such as sugars