Media containing some ingredients of unknown chemical composition are called ________ media.
A. synthetic
B. defined
C. complex
D. undefined
Answer: C
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Which of the following is not an example of artificial selection?
A. different varieties of roses; yellow, pink, red, thornless, climbing, etc. B. different breeds of cats; Siamese, Persian, Himalayan, American shorthair, etc. C. different types of tomatoes; roma, beefsteak, grape, cherry, etc. D. different styles of potatoes; fried, mashed, baked, etc. E. different breeds of dogs; poodle, basset hound, Chihuahua, Great Dane, etc.
A tRNA that carries a specific amino acid enters the protein-synthesizing machinery at the ribosomes and pairs with the appropriate
A) anticodon. B) codon. C) amino acid. D) charge.
An individual generally acquires natural active immunity after
A. An infusion of T lymphocytes B. An injection of IgG C. Suffering an illness D. A blood transfusion E. Taking immunosuppressive drugs
All of the following characterize the secondary response to an antigen exceptÂ
A. it is also known as the anamnestic response. B. it is mostly IgM antibodies that are produced. C. a higher titer of antibody is produced than the primary response. D. a longer persistence of antibody than with the primary response. E. a quicker rate of antibody synthesis than the primary response.