Which of the following can be used as vectors for cloning DNA fragments?

A. bacteriophages
B. plasmids
C. cosmids
D. All of the choices are correct.


Answer: D

Biology & Microbiology

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Suppose that nondisjunction occurs during meiosis II in oogenesis, and each of the resulting four cells is fertilized with a normal sperm (imagine four functional egg cells result from oogenesis). How many cells are normal and how many have a chromosomal trisomy?

A. three, one B. one, three C. two, one D. one, two E. two, two

Biology & Microbiology

The immune system component with a principal role at point B in the accompanying figure is:

a. memory cells. b. IgM antibodies. c. IgG antibodies. d. cytotoxic T cells. e. antibody IgA.

Biology & Microbiology

Due to the diversity of retroviruses, they can be placed into more than one Baltimore system group.

Answer the following statement true (T) or false (F)

Biology & Microbiology

The fluid portion of the blood is called ________

Fill in the blank(s) with correct word

Biology & Microbiology