Which of the following is NOT a way that bacteria benefit humans?
A. killing harmful insects
B. breaking down wastes, toxins, explosives, and petrochemicals
C. production of antibiotics
D. production of foodstuffs such as cheese
E. transferring nutrients across intestinal membranes
Answer: E
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A change in a single nucleotide that results in no change in the amino acid sequence of the polypeptide produced is known as a
A) nonsense mutation. B) silent mutation. C) missense mutation. D) frameshift mutation. E) none of the above
Results from the study of globin variants indicate that ____
a. all amino acid substitutions cause severe phenotypic effects b. a change in a single nucleotide is sufficient to cause a genetic disorder c. extended chains of phosphorus molecules function to carry oxygen d. all of the changes in globin are due to changes in amino acid sequences e. sickle cell anemia is not primarily an inherited disease
Movement of matter or energy in nature may be the
result of a. concentration gradients. b. differential pressures. c. differences in electrical charges. d. the existence of thermal differentials. e. all of these.
Which of the following statements regarding Staphylococcus aureus in FALSE?
A) Staphylococcus aureus sometimes can be found in the blood samples of healthy individuals. B) Staphylococcus aureus is a normal flora organism of nose and throat. C) Staphylococcus aureus is often resistant to common antibiotics. D) Staphylococcus aureus is commonly found in the stomach. E) Staphylococcus aureus is a halotolerant bacterium.