A plasmid is a
a. small segment of DNA that is often isolated
from virus chromosomes for cloning
purposes.
b. large linear segment of DNA that is often
isolated from bacterial chromosomes for
cloning purposes.
c. small circular segment of DNA in bacteria
that is linked by hydrogen bonds to the
main bacterial chromosome.
d. large circular segment of DNA in bacteria
that is completely separated with the
chromosome.
e. small circular segment of DNA in bacteria
that is completely separated from the
chromosome.
E
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Most monocots have numerous ____ roots arising from the stem
a. adventitious b. primary c. secondary d. taproot e. nonfibrous
During the third phase "3", the population
growth slows and then levels off because
a. essential resources become scarce. b. the carrying capacity has been reached. c. competition for food becomes increasingly important. d. predators eat fawns as they are born. e. all of these occur except "predators eat fawns as they are born."
Proteins that bind to foreign matter making it easier for phagocytosis are called
A) integrins. B) opsonins. C) leukotins. D) selectins. E) heparin.
Choose all the characteristics that are true about "active immunity."
> It protects the body against a new infection thanks to antibodies developed by the host during the first exposure to the antigen. > It requires several days to develop. > It can last for a relatively long time, sometimes for life. > Active immunity can be stimulated only by artificial means. It protects the body against a new infection thanks to antibodies developed by the host during the first exposure to the antigen. It requires several days to develop. It can last for a relatively long time, sometimes for life.