Bacterial cells that cannot readily pick up DNA molecules from their surroundings can be induced to do so by ____
a. artificial transformation
b. double crossing over
c. crossing over
d. constriction
e. infection
ANSWER: a
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Microphthalmia is a condition that causes chickens to have very small eyes, but it only appears in hens. The condition is autosomal recessive. Microphthalmia is sex-influenced and not sex-limited because
A) it is recessive in males and dominant in females. B) sex-influenced traits affect structures or functions that are present only in males or only in females. C) it is not transmitted on a sex chromosome. D) sex-limited traits affect structures or functions that are present only in males or only in females.
Trypanosomes that infect humans are transmitted by:
a. biting insects b. contaminated water c. contaminated food d. aerosols e. parasitic worms
Superantigens are
A. cell markers found in some member of a species but not in other members. B. bacterial toxins that activate T-cells at a 100 times greater rate than other antigens. C. body tissues that the immune system mistakes as foreign. D. those that evoke allergic reactions.