Which of the following sources of alternative energy involves using uranium or other materials to split the nucleus of an atom?
A. hydroelectric energy
B. wind turbines
C. nuclear energy
D. geothermal energy
Answer: C
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What type of flower should you plant in your garden if you are particularly interested in attracting butterflies?
A. White day-blooming flowers with abundant pollen and a strong floral scent. B. Pendulous red flowers that are open day and night with no scent. C. Yellow flowers with abundant pollen and nectar and a strong floral scent. D. White, night-blooming flowers with a strong floral scent. E. Purple, tubular-shaped flowers with a light floral scent.
In birds and mammals, a vestige of the sinus venosus of the fish heart remains as the sinoatrial node, which serves as a(n)
A. pacemaker. B. inhibitory node. C. diastole detector. D. site of erythropoiesis. E. baroreceptor.
What structures are used by bacteriophages to attach to host cell receptors?
A. Tail fibers B. Capsid heads C. Nucleic acids D. Viral sheaths
Which of the following has the thickest muscle layer?
a. Left ventricle b. Vena cava c. Right atrium d. Capillaries e. Aorta