The most abundant of the circulating white blood
cells are the
a. neutrophils.
b. macrophages.
c. mast cells.
d. eosinophils.
e. lymphocytes.
Answer: a
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Toll-like receptors (TLRs) bind molecules on pathogens. Why is this helpful to the immune response?
A. It provides a highly specific response to very small and highly unique areas on an individual pathogenic microbe, providing the most specific and selective response possible. B. It provides a general response to broad categories of molecules/cells that should NOT be in our system, as we don't have these molecules on our own cells. C. These secreted molecules help bind pathogens and then direct them to receptors on the immune system cells that are best capable of eliminating them from our systems. TLRs are delivery mechanisms for the immune responses. D. TLRs are capable of directly lysing (destroying) the microbes, helping our immune responses by eliminating pathogens.
All of the following can enter into anaerobic glycolysis to produce pyruvate EXCEPT __________.
Which of the following statements is false concerning the outermost layer of the epidermis?
a. It is the first to experience any abrasion. b. Keratin provides waterproofing. c. Millions of cells are worn off daily. d. Its cells are undergoing rapid cell division. e. It is called the stratum corneum.
What trait distinguishes semiperishable foods such as potatoes and nuts from perishable foods such as meats?
a. carbohydrate/sugar content b. natural microbial flora content c. salt content d. water activity/moisture content