Which of the following is an example of a condition which could result in obstructive pulmonary disease?
a) pneumonia
b) osteoporosis
c) asthma
d) scoliosis
Ans: c) asthma
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When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands do not diminish in length
Indicate whether the statement is true or false
Different T-cell receptors can respond to different antigens because of different
A. complement binding sites in the receptors. B. variable regions in the structure of the receptors. C. antigenic determinants. D. epitopes in the receptor's structure. E. selection processes.
The immune system is important in preserving the body's immunity by eliminating tumors that produce antigens.
a. true b. false
Minerals are organic elements extracted from the soil by plants.
Answer the following statement true (T) or false (F)