During translation, tRNAs bind to mRNA through ____
a. ionic bonds
b. van der Waals forces
c. nonpolar covalent bonds
d. hydrogen bonds
e. polar covalent bonds
ANSWER: d
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The failure to develop tolerance may result in dangerous reactions to self-antigens, a condition called
A) type I hypersensitivity. B) immunotolerance. C) autoimmunity. D) immunodeficiency.
Which of the following statements about gastrin is false?
A. Gastrin secretion is initiated in response to the sight or smell of food. B. A low pH in the stomach inhibits the secretion of gastrin. C. Gastrin stimulates the production of HCl. D. Gastrin is produced by the stomach, absorbed within the small intestine, and recirculated back to the stomach. E. None of these statements about gastrin is false.
Cancer cells ____
a. maintain telomerase function b. have longer telomeres than normal cells c. eventually die due to shortening chromosomes d. have circular chromosomes e. cannot replicate their DNA
An age pyramid with a broad base that quickly slopes up to a narrow top would be indicative of ________.
A. an industrialized nation B. a population with a high average age C. a population with a high survivorship of older adults D. a developing nation