Answer the following statements true (T) or false (F)
1. All enzymes are proteins.
2. Because of the abundance of ribosomes, translation is NOT an energy costly process for the cell.
3. The cells of every organism make only a few different tRNA molecules encoded by the same gene.
4. In eukaryotes, the 40S and 60S subunits combine to form a 100S ribosome.
1. FALSE
2. FALSE
3. FALSE
4. FALSE
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With sexual reproduction, two genes for the same
trait that are slightly different are called __________. Fill in the blank(s) with the appropriate word(s).
Twenty-five people developed symptoms of nausea, vomiting, and diarrhea three to six hours after attending a church picnic where they ate a ham and green bean casserole with cream sauce. The most likely cause of this case of food intoxication is
A) botulinum toxin. B) aflatoxin. C) staphylococcal enterotoxin. D) erythrogenic toxin. E) cholera toxin.
A life-threatening bacterial infection that results in complete blockage of the airway due to swelling of a flap of tissue that normally protects the lungs during swallowing is
A) epiglottitis. B) croup. C) hay fever. D) dyspnea. E) stridor.
Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours?
A. It brings minerals up the plant. B. It gives plants a needed rest. C. It prevents sugar transport to the guard cells. D. It helps to conserve water. E. It prevents loss of CO2.