African sleeping sickness is caused by Trypanosoma brucei, a unicellular, flagellated protist that infects red blood cells after entering the bloodstream. African sleeping sickness is transmitted by
A. ingesting food.
B. contaminated water.
C. sexual intercourse.
D. the bite of an insect.
E. exhaled aerosols.
Answer: D. the bite of an insect.
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Energy is defined as
A. heat. B. the capacity to do work. C. change. D. movement.
Which of the following is true for ALL exergonic reactions?
A. The products have more total energy than the reactants. B. The reaction proceeds with a net release of free energy. C. Some reactants will be converted to products. D. A net input of energy from the surroundings is required for the reactions to proceed. E. The reactions are nonspontaneous.
All of the following are functions of the myelin sheath EXCEPT which one?
A) The myelin sheath speeds up transmission of action potentials. B) The myelin sheath insulates a neuron and saves the neuron energy. C) The myelin sheath plays an important role in synaptic transmission. D) The myelin sheath is involved in the repair of damaged neurons in the peripheral nervous system.
How does a cell typically know when to divide?
A) Cells have an internal clock and divide only when they reach a certain age. B) Tumor suppressor genes code for growth factor proteins that initiate cell division. C) Proto-oncogenes code for growth factor proteins that initiate cell division. D) Oncogenes code for growth factor proteins that initiate cell division.