Spongiform encephalopathies are
A. caused by prions.
B. Creutzfeld-Jacob disease, kuru, and Gertsmann-Strussler-Scheinker syndrome.
C. associated with abnormal, transmissible, protein in the brain.
D. chronic, fatal infections of the nervous system.
E. All of the choices are correct.
Answer: E
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Which of the following best describes the ploidy level of the cells found in a fertilized embryo sac?
A) All cells are diploid. B) All cells are triploid. C) All cells are polyploid. D) The ploidy level varies among species. E) There are haploid, diploid, and triploid cells.
Using the data in the figure above, how long does it take for virus B to go through one lytic cycle?
A) 15 minutes B) 30 minutes C) 45 minutes D) 60 minutes
Ribozymes were discovered ________ protein enzymes, even though they ________
A) before; only catalyze one type of cellular reaction B) before; are more heat labile than protein enzymes C) after; catalyze many important cellular reactions D) after; are the only catalysts found in bacteria and archaea E) at the same time as; only catalyze one type of cellular reaction
Which to these functions of the kidneys are mismatched.
a) excretes metabolic wastes-rids the body of urea b) maintains the water-salt balance-helps regulate blood pressure c) maintains the acid-base balance-rids the body or uric acid d) secretes hormones-secretes erythropoietin e) all of the choices are correct