Which permits a single gene to code for more than one polypeptide?
A) retention of different introns in the final version of the different mRNA strands
B) alternative RNA splicing
C) differentiation
D) addition of different types of caps and tails to the final version of the mRNA strands
Answer: B
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An organism such as Mycobacterium tuberculosis would absorb which stain in its cell wall?
a. Crystal violet b. Methylene blue c. Carbolfuchsin d. Malachite green
The gonads are another name for
a. the parathyroid and thyroid. b. the ovary and testis. c. the adrenal cortex and medulla. d. the anterior and posterior pituitary. e. none of these
An increase in the production of ADH affects the kidney tubules by
A. decreasing the insertion of aquaporins into the membranes of cells that line the collecting ducts. B. causing the walls of the collecting duct to become more permeable to water. C. inhibiting reabsorption of sodium ion in the collecting duct. D. decreasing the permeability of the glomerulus to water. E. inhibiting the reabsorption of water in the glomerulus.
Which of the following is an example of pasteurization?
A) A public toilet is treated with disinfectants. B) A surgeon washes her hands before surgery. C) Heat is used to kill potential pathogens in apple juice. D) An autoclave is used to prepare nutrient agar. E) A nurse prepares an injection site with an alcohol swab.