The formation of a tough grayish membrane in the throat is a characteristic of which one of the following diseases?
a) Scarlet fever
b) Psittacosis
c) Q fever
d) Diphtheria
Ans: d) Diphtheria
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Which of the following is TRUE of both T cells and B cells?
A. They are lymphocytes. B. They recognize specific antigens on the cell surface. C. They have class I MHC molecules on their cell surface. D. They are involved in the humoral immune response. E. All of the responses are correct.
What are proteins?
a. long chains of glucose molecules b. long chains of fatty acids c. long chains of amino acids d. long chains of nucleotides
Trace the flow of a water molecule that is used during photosynthesis
A) stoma ? xylem ? root hair ? mycorrhiza B) soil ? root hair ? xylem ? stoma ? atmosphere C) soil ? root hair ? xylem ? leaf cell D) soil ? xylem ? leaf cell ? atmosphere
Which of the following could happen to the neurotransmitter once it binds to the receiving membrane receptors?
A. released back into the synaptic cleft where it builds up B. absorbed by the receiving membrane in order to start the action potential C. stays bound to the receiving membrane D. reabsorbed by the sending membrane E. degrades due to lack of Ca+