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
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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
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.
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)
The fluid portion of the blood is called ________
Fill in the blank(s) with correct word