Which of the following pairs is incorrectly matched?
A. cytotoxic T cell; class I MHC protein
B. B cell; class I MHC protein
C. helper T cell; CD4
D. B cell; IL-2 secretion
E. macrophage; class II MHC protein
Answer: D
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Which aspect of phospholipids is most important to the formation of bilayers?
A) They are amphipathic. B) Their size is large, relative to cholesterol. C) Their size is small, relative to fats. D) Their hydrocarbon tails can consist of fatty acids or isoprene subunits.
Plants that reproduce asexually by growth of a new plant from stems or roots show vegetative propagation.
Answer the following statement true (T) or false (F)
When first used in medicine in the 1940s, penicillin was uniformly effective in killing the bacterium Staphyloccocus aureus. Today, ____________________ has led to an increase in antibiotic-resistant alleles, and humans are increasingly at risk from untreatable Staphyloccocus aureus infections.
a) uncleanliness in hospitals b) natural selection in Staphyloccocus aureus populations c) natural selection in human populations d) the substitution of methicillin for penicillin e) molecular genetics
Secondary metabolites are often useful, and are obtained by
A. harvesting a culture during log phase. B. allowing a culture to enter stationary phase. C. growing a culture at sub-optimal temperature. D. adding chemicals that alter metabolic pathways. E. using continuous flow culturing.