S. pyogenes associated with invasive disease characteristically have
A. leukocidins.
B. coagulase.
C.
streptococcal pyrogenic exotoxin A.
D.
streptococcal pyrogenic exotoxin B.
E.
streptococcal pyrogenic exotoxins A AND B.
E.
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Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of experiments in which E. coli was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell?
A) protein B) RNA C) ribosome D) DNA
The placenta is normally located in the
A. ovary. B. fallopian tube. C. uterus. D. abdominal cavity.
What happens to an astronaut who spends 2 months in the weightless environment of a space capsule?
A) Bone density increases and muscle mass increases. B) Bone density decreases and muscle mass increases. C) Bone density decreases and muscle mass decreases. D) Bone density increases and muscle mass decreases.
Gel electrophoresis is a technique used to
a. cut DNA into pieces of vaious sizes b. separate DNA fragments by charge and size b. move DNA fragments from one species to another c. make copies of chromosomes