Which of the following characteristics or actions is associated with a steroid hormone?
A. cyclic AMP
B. activation of proteins present in an inactive form
C. the second messenger
D. production of new proteins
E. binding of a protein to a surface receptor on the plasma membrane
Answer: D
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Which type of leukocyte is involved in killing eukaryotic parasites?
a. monocytes b. neutrophils c. eosinophils d. lymphocytes e. basophils
A bacterial toxin that is not ordinarily releases but instead is an integral part of gram-negative cell walls is called a(n)______
a. endotoxin b. toxoid c. exoenzyme d. exotoxin e. enterotoxins
Evolving genome sequencing methods continue to be used in ever more time-sensitive situations. Which of the following is an emerging situation in which the CDC is using WGS, NGS, and TGS?
A) vaccine generation B) tracking impact of pathogens on host genomes C) isolating pathogens after they have spread D) pathogen identification
It is likely that vestigial traits remain in place for some organisms when they serve no current functions be-cause:
a. the trait is not costly to the organism. b. natural selection does not act against the trait. c. there is some natural selection against the trait—it is on its way out and will eventually be lost. d. All of the above.