Over 90% of Staphylococcus aureus isolates are penicillin-resistant. Why?
A. they have loosely organized polysaccharide slime layers which protects their cell wall.
B. they produce coagulase.
C. They have a coating of protein A.
D. they produce ?-lactamase.
E. they produce staphylokinase.
Answer: D
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Organisms that are indifferent to the presence of oxygen and do not use it are
A. aerotolerant anaerobes. B. facultative anaerobes. C. obligate aerobes. D. microaerophiles.
Which of the following uses a mosquito as a vector?
A) Anopholes B) Parelaphostrongylus C) Plasmodium D) Borrelia
Which of the cells below develop into a human embryo?
A. Trophoblast B. Extraembryonic C. Inner cell mass D. Blastcoel
The base pairing between ________ is especially strong because it contains an additional ________ bond, compared to ________
a. A and T / ionic / C and G b. A and T / hydrogen / C and G c. C and G / ionic / A and T d. C and G / hydrogen / A and T