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

Biology & Microbiology

You might also like to view...

How can foreign DNA of greater than 300 kbp be inserted and stably maintained in BAC vectors?

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology

Trypanosomes that infect humans are transmitted by:

a. biting insects b. contaminated water c. contaminated food d. aerosols e. parasitic worms

Biology & Microbiology

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.

Biology & Microbiology