Which of the following statements about effector cells is FALSE?
a. They are fully differentiated lymphocytes.
b. They can develop from either B cells or T cells.
c. They secrete immunoglobulins or interleukins depending on their origin.
d. Cytotoxic T cells are effector cells
e. Helper T-cells are not effector cells.
E
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In humans and other mammals, dosage compensation is achieved by:
A. males transcribing double the normal amount of copies of X-chromosome genes. B. females decreasing transcription of both X chromosomes by ½. C. females eliminating one X chromosome in each cell. D. females inactivating the paternal X chromosome in each cell. E. females randomly inactivating one X chromosome in each cell.
An application of pharmacogenomics is the study of ____ for determining the appropriate dosages of certain drugs in
specific patients.
a. drug metabolism genes b. body size c. blood volume d. trial and error methods e. drug interactions
The brush border lining of the small intestine is derived from ____
a. rugae b. villi c. microvilli d. autonomic nerves e. circular smooth muscle
When a small amount of hydrochloric acid (HCl) is added to a solution of Na2HPO4, the pH of the
solution does not change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to this same solution. Based on these observations, the compound Na2HPO4 is: a. able to donate hydrogen atoms to HCl. b. able to remove hydrogen ions from the OH? of NaOH. c. acting as a buffer. d. an enzyme facilitating the reaction between HCl and NaOH. e. acting as a solvent.