What kind of bond exists between two amino
acids in a protein?
a. peptide
b. ionic
c. hydrogen
d. amino
e. sulfhydroxyl
A
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The lacA gene found within the lac operon encodes for galactosidase transacetylase. This enzyme attaches a(n) ________ group to lactose and lactose analogs.
A. amino B. hydroxyl C. carbonyl D. acetyl E. carboxyl
What would happen if a woman took supplemental estrogen and progesterone beyond the 21st day of her
menstruation cycle? What will be an ideal response?
Biotechnology includes all of the following except
A. modifying antibiotics with different chemical functional groups to increase their potency. B. using genetically-modified E. coli as a tool to detect cancer. C. using bacterial insecticidal proteins as a means to combat mosquitoes as disease vectors. D. using bacterial antifreeze proteins to protect crops from lethal frosts.
A doctor's office has run out of the latest flu vaccine, but many patients are asking for it. One of the nurses finds some vials from last year's batch in a refrigerator. Should they be used?
A. Yes, because the preservatives and refrigeration ensure that the vaccine is still fresh. B. No, because each year the vaccine is made against different subtypes of the flu virus. C. Maybe, the vaccine should be mixed in a test tube with the virus to see if it still inactivates it. D. No, because each year the technology to make a good vaccine improves.