The subunit of protein is the ________.
A. nucleic acid
B. carboxylic acid
C. amino acid
D. fatty acid
Answer: C
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If T-lymphocytes that failed the negative selection test were not destroyed, the immune system would likely
A. cause autoimmune disorders. B. exhibit very delayed activity. C. be unable to recognize a particular class of pathogen. D. exhibit more negative membrane potentials.
There is a constant flow of blood through the capillaries even though the heart is forcing blood out into the arterial system only part of the time
Indicate whether the statement is true or false
Compared to blood capillaries, lymph capillaries exhibit all of the following except that they
A) have no basement membrane. B) are larger in diameter. C) have walls of endothelial cells that overlap like shingles. D) are smaller in diameter. E) are frequently irregular in shape.
Blood is supplied to the left atrium by the
A) brachiocephalic artery. B) right coronary artery. C) left coronary artery. D) phrenic arteries. E) pulmonary arteries.