Vaccines are not effective against trypanosomiasis because
A. the organism is only weakly antigenic.
B. the organisms are never exposed to the immune system.
C. the organism can change its protein coat and thereby evade the immune response.
D. All of the choices are correct.
Answer: C
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The "Age of Fishes" is an informal name for the:a
Ordovician period. b. Silurian period. c. Devonian period. d. Permian period. e. Carboniferous period.
Which of the following methods of genetic recombination is common to both eukaryotic and bacterial cells?
A. Crossing over B. Vertical gene transfer C. Gamete fusion D. All of the choices are correct.
Calculate the minimum number of nucleotide triphosphate molecules that are hydrolyzed in the synthesis of a 200-amino-acid bacterial protein and list the stages of translation responsible for the hydrolysis
What will be an ideal response?
Consider the human population. With regards to the ABO blood groups there are _____ alleles, ____ possible genotypes, and _____ possible phenotypes.
A. 3, 4, 6 B. 2, 4, 6 C. 2, 3, 4 D. 2, 6, 4 E. 3, 6, 4