Which of the following is associated with mental retardation in Down syndrome?
A. thickening of the muscles of the tongue
B. elevated levels of purines in the blood
C. increased tendency toward leukemia
D. increased tendency toward cataracts
E. accelerated rate of aging
Answer: B
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Which of the following statements about the botulism toxin is NOT true?
a. It is an exotoxin. b. It is produced by the bacterium Clostridium. c. It may be found as a contaminant in poorly prepared food. d. Its brand name is Botox. e. It causes muscles to contract.
Ovulation is triggered by
a. high levels of LH. b. low levels of LH. c. low levels of estrogen. d. high levels of estrogen. e. high levels of progesterone
Sometimes, the decline of one species threatens the survival of another species. Which scenario is an example of this?
a. declines in polar bears result in diminished prey populations b. the arrival of sailors on Mauritius island led to the extinction of dodo birds c. declines in eagle populations due to the accumulation of pollutants in their eggs d. decline in buffalo caused a drop in native buffalo clover e. pollution led to declines in the Texas blink salamander population
Which of the following do NOT contain endoplasmic reticulum?
A. noneukaryotes B. animal cells C. eukaryotic cells D. All of the choices are correct.