What evolutionary force is definitely not responsible for generating the obvious differences between races?
A. genetic drift
B. natural selection
C. sexual selection
D. gene flow
D
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Approximately how many species have we described out of the species alive today? We have described _____
A) almost all of the species on Earth. B) about one-eighth of the species on Earth. C) about one-quarter of the species on Earth. D) about half of the species on Earth. E) only a small fraction of the species on Earth.
The organism that is found in vegetation and occasionally in the hospital environment grows best at which temperature?
a. 4°C b. 25°C c. 35°C d. 56°C
Beta-hemolytic group A streptococci are responsible for ________.
A. pharyngitis B. necrotizing fasciitis C. rheumatic fever D. All of the choices are correct.
What are the general structural features of a prokaryotic plasmid?
A) circular double-stranded DNA in the nucleus B) linear double-stranded DNA integrated into the chromosome C) proteins on the bacterial chromosome D) made of protein and existing in the cytosol E) circular double-stranded DNA in the cytosol