Which of the following is not an amino acid?
A. glycine
B. uracil
C. valine
D. alanine
E. tryptophan
Answer: B
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The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its
A. conformation. B. amino acid sequence. C. net charge. D. solubility. E. immunity.
Within a genome, an enhancer may be located
A) upstream of the gene enhanced. B) downstream of the gene enhanced. C) within the gene enhanced. D) choices A, B, and C E) both choices A and B
Seed banks ____
a. provide a source of seeds for farmers b. preserve seeds for museums c. preserve plant genetic diversity d. distribute seeds to member seed companies e. help to create additional plant diversity
A 57-year-old woman was admitted to a hospital with an infected toe, and the infection was spreading rapidly. The damage was being caused by an unknown microorganism that could not be cultured in the lab Doctors observed that antibiotics, which kill only prokaryotes, were ineffective. They suspected that the microbe was a fungus, so they tried the drug Amphotericin, which targets the ergosterols in fungal cells. Because animal cells contain cholesterols, not ergosterols, they are unaffected by the drug. Shortly after receiving Amphotericin, the patient improved, her infection ceased, and she was released from the hospital. In this scenario, what was the hypothesis?
A) Antibiotics will not kill the microbe because it is a fungal species.
B) A microbe that has cholesterol is causing the infection.
C) Why didn't the antibiotics kill the microbe that caused the infection?
D) If the infection is caused by an animal, then Amphotericin will cure the patient.
E) The infection will spread rapidly.