Messenger RNAs that contain no stop codons due to a frameshift mutation are eliminated by
A) nonstop decay.
B) directed RNase activity.
C) nonsense-mediated decay.
D) error-mediated repair.
E) none of the above
A) nonstop decay.
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The theory of aging that posits that aging is caused by irreparable damage to the cells, tissues, and organs of an organism brought about by such things as errors in protein synthesis and the accumulation of toxic metabolites is the ________
A) theory of senescence B) rate of living theory of aging C) evolutionary theory of aging D) particulate theory of aging
Diffusion _____
A) is very rapid over long distances B) requires an expenditure of energy by the cell C) is a passive process in which molecules move from a region of higher concentration to a region of lower concentration D) requires integral proteins in the cell membrane
Which of the following statements regarding the urinary system is true?
A) Bowman's capsule envelops the glomerulus. B) Most glomeruli are located in the renal medulla. C) The urinary bladder receives ammonia for excretion. D) The urethra is responsible for transporting urea from the kidney to the urinary bladder.
Fire fighters wearing fully encapsulated suits are particularly susceptible to ______.
a. heat stress b. mechanical injury c. respiratory injury d. cardiac arrhythmia