Biosphere 2 was an attempt by scientists to build a completely closed ecosystem in Arizona. It failed
because of the
a. decreased level of oxygen through respiration by soil microorganisms.
b. contamination of food by soil microorganisms.
c. disease outbreak caused by soil microorganisms.
d. increased level of carbon dioxide produced by photosynthetic microorganisms.
e. inability of soil microorganisms to recycle nitrogen.
A
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Turner syndrome is associated with severe mental retardation. Indicate whether the statement is true or false
How similar to the donor would a cloned human be?
A) They would be no more alike than identical twins. B) They would look different but have the exact same personalities. C) They would have the same genes, but everything else about them would be different. D) They would be identical in looks and personalities.
Pepsin is an enzyme that digests proteins at acidic pH. Therefore, it must act in the
A. small intestine. B. mouth. C. esophagus. D. large intestine. E. stomach.
How did some strains of Staphylococcus aureus become resistant to antibiotic drugs?
a. Patients did not take the drug as it was prescribed. b. Bacteria mutated in response to the drug. c. None of the listed responses are correct. d. Some members of the bacteria population must have had genes that made them resistant to antibiotics, and these genes became more prevalent in subsequent generations. e. The drug did not work in the way that the developers intended.