HIV-1 Group M is responsible for 95% of human infections. When is it estimated that HIV-1 Group M was transferred to humans?
A) 1980
B) 1960
C) 1930
D) 1995
E) 1900
C
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Which one of the following is not a common mechanism by which antimicrobial agents kill or inhibit the growth of bacteria?
A) damage to cell membranes B) destruction of capsules C) inhibition of cell wall synthesis D) inhibition of protein synthesis
The molluscs:
a. do not have a larvae stage. b. lack a digestive system. c. have bodies divided into segments. d. possess a soft body covered with a mantle. e. make a chitinous shell.
The differences between males and females of a species are called ________
A) sexual morphism B) male/female dimorphism C) sexual differentiation D) sexual dimorphism
You would reasonably expect to find the subspecies of a particular species
A. incapable of interbreeding. B. occupying slightly different habitats or even distinct habitats. C. having distinct differences from each other, so as to be easily recognized by the untrained observer. D. All of these answers are true.