Seriously abnormal phenotypes or harmful mutations are acted against or reduced to low frequencies by which
mechanism?
a. gene flow
b. genetic drift
c. natural selection
d. disruptive selection
e. beneficial mutations
c
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The prevention of infection caused by microorganisms is called
A. antisepsis. B. sanitization. C. sterilization. D. disinfection.
Immunoglobulins inactivate microbes in all of the following ways EXCEPT via
A. perforating the microbial cell membrane. B. binding toxins. C. linking microbes to complement proteins. D. opsonization. E. perforating membranes or binding toxins.
Which of the following statements is FALSE regarding a rightward shift in the hemoglobin-oxygen dissociation curve?
A) Affinity for oxygen is decreased. B) Hemoglobin unloading of oxygen is increased. C) It can be caused by a decrease in 2,3-BPG. D) Oxygen loading onto hemoglobin is decreased. E) A rightward shift usually occurs in active tissue.
How many chromosomes should be in a generative cell nucleus?
A) 8 B) 16 C) 24 D) 32