All of the following are correct about Streptococcus pyogenes, except:
A. humans are the only significant reservoir.
B. some of the streptococcal toxins act as superantigens.
C. most strains do not have a capsule.
D. it can cause impetigo and erysipelas.
E. infection is generally through direct contact.
Ans: C. most strains do not have a capsule.
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Consider solution A (pH 6) and solution B (pH 9). Which of the following statements is CORRECT?
A) Solution A is 3 times more acidic than solution B. B) Solution A is 300 times more acidic than solution B. C) Solution B is 1,000 times more alkaline (basic) than solution A. D) Solution B is 3,000 times more alkaline (basic) than solution A.
Answer the question using the accompanying figure.Which structure vibrates and bends the sensory hairs?
a. 1 b. 2 c. 3 d. 4 e. 5
Fatty acids that contain the maximum number of hydrogen atoms possible are:
A. monounsaturated B. saturated C. phospholipids D. polyunsaturated
In which of the following environments do Gram-negative bacteria have an advantage?
A) dry environment B) abrasive environment C) wet environment D) mechanical crushing E) needing to adhere to a host