The following are steps in the cell-mediated immune response. What is the correct sequence for these steps? 1. Several cycles of mitosis occur. 2. Antigen is engulfed and presented by a macrophage. 3. Cytotoxic T cells migrate to focus of infection. 4. T cells with specific receptors recognize the antigen. 5. T cells differentiate into cytotoxic T cells or T memory cells. 6. Cytotoxic T cells
release perforin and/or lymphotoxin.
A) 4, 1, 5, 3, 6, 2
B) 2, 4, 1, 5, 3, 6
C) 1, 2, 4, 5, 3, 6
D) 3, 2, 4, 1, 5, 6
E) 3, 6, 4, 5, 1, 2
B
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What is the primary function of the large intestine?
A. Protein digestion and nutrient absorption B. Storage of vitamins and minerals C. Secretion of water, salts, sodium bicarbonate, and enzymes D. Water and electrolyte absorption E. None of the choices is correct.
Transamination
A. results in free fatty acids. B. requires glucose. C. can be used to synthesize essential amino acids. D. involves removing an amine group from an amino acid. E. directly produces urea.
In the embryo, the neurohypophyseal bud gives rise to the ____, and the hypophyseal pouch gives rise to the _____.
a. anterior pituitary; hypothalamus b. posterior pituitary; hypothalamus c. anterior pituitary; posterior pituitary d. hypothalamus; anterior pituitary e. posterior pituitary; anterior pituitary
In this close-up image of a lung, what structure does number 1 indicate?
A. Respiratory bronchiole B. Alveolar duct C. Alveolus D. Terminal bronchiole E. Bronchiole