The number of possible combinations of genes in humans is virtually limitless. One reason is random assortment of chromosomes and the other is
A. crossing over.
B. spermiogenesis.
C. nondisjunction.
D. random mating.
E. reduction division.
Answer: A
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Which of the following statements about hormone synthesis is NOT correct?
A. Progesterone is a precursor of mineralocorticoid and glucocorticoid hormones. B. Pregnenolone is a precursor for all steroid hormones. C. Progesterone can be a precursor of cortisol. D. Peptide hormones are polymers of amino acids. E. Tryptophan is a precursor for thyroid hormones.
After passing from the thoracic cavity over the border of the first rib, the subclavian artery changes its name. The name changes continue along the arm and to the hand. In correct order, these names are:
(1) superficial palmar arch (2) deep palmar arch (3) brachial artery (4) radial artery (5) axillary artery (6) ulnar artery A) 5, 3, 4 or 6, 1 or 2 B) 6, 5, 4, 3, 2, 1 C) 1, 2, 3, 4, 5, 6 D) 1 or 4, 2, 3 or 5, 6 E) None of the answers are correct.
What makes a cell responsive to a particular hormone?
A. The site where the hormone is secreted B. The location of the gland that secretes the hormone C. The presence of a receptor for that particular hormone D. The location of the target cells in the body E. The chemical properties of the hormone
In order for a molecule to be detected by the olfactory neurons, it must
A. be present in high concentrations. B. be one of the seven primary classes of odors. C. be dissolved in fluid covering the olfactory epithelium. D. interact with the mechanoreceptors of the olfactory hair membrane. E. enter the nose slowly.