The __________________ consists of proteins in the blood plasma that are activated when bacteria or fungi are present and that insert into the foreign cell's membrane.
A. natural killer cell
B. complement system
C. inflammatory response
D. macrophagic defense system
Ans: B. complement system
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The flagella of bacteria rotate at their bases like propellers
Indicate whether the statement is true or false.
Microevolution is the result of all of the following EXCEPT
a. chance variation. b. change in gene frequency. c. mutation. d. natural selection. e. large scale patterns or trends.
The thyroid gland is located
A. in the brain. B. in the neck. C. near the ovaries or testes. D. on top of the kidneys. E. near the small intestines.
Which of the following is incorrect about termination codons?
A. Termination codons include UAA, UAG, UGA. B. Termination codons do not have corresponding tRNA. C. They are also called nonsense codons. D. Termination codons include AUG. E. They occur where the bond between the final tRNA and the growing polypeptide is broken.