What is true regarding cytokines?
A. Cytokines protect in the attack of pathogens by phagocytosis.
B. Cytokines bind to intracellular receptors.
C. Cytokines are immune cells involved in producing antibodies.
D. Cytokines are secreted by TH cells and bind to receptors.
E. Cytokines are secreted by pathogens during infection.
Answer: D
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A histidine, methionine auxotroph _________
A. can synthesize only histidine and methionine B. can only use histidine and methionine as nutrition sources C. cannot synthesize histidine and methionine D. is killed by histidine and methionine E. lacks proteins with histidine or methionine
Replication of a bacterial chromosome begins at a specific region called the ____
a. ter b. replication fork c. beg d. ori e. rep
What kind of reaction produces small molecules by cleaving large molecules?
a. oxidation b. reduction c. condensation d. hydrolysis e. decarboxylation
The pathogen Haemophilus influenzae B causes_____.
A) Meningitis in children B) Upper respiratory flu C) Endocarditis D) Genital chancroid