African sleeping sickness is caused by Trypanosoma brucei, a unicellular flagellated protist infects red blood cells after being injected into the blood stream. 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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Purines and pyrimidines are precursors for synthesis of ________.
A. fatty acids B. peptidoglycan C. nucleic acids D. proteins
Which of the following are characteristics of Archaeopteryx lithographica? Check all that apply.
_____ a beak with teeth _____ a small, reptilian breastbone _____ claws _____ feathers on its wings _____ a tail with few vertebrae
Which of the following is NOT a factor involved in
the theory of evolution? a. Organisms reproduce beyond the limits of the environment that supports them. b. Food supplies keep pace with the growth of populations feeding upon them. c. Traits have a heritable basis. d. There is much variation in the characteristics of organisms making up a population. e. Some traits are more adaptive than others.
Which cells mature in the thymus gland?
a. T cells b. mast cells c. macrophages d. neutrophils e. eosinophils