When heart valves do not close fully or open incompletely, this can be heard using a stethoscope as
A. lub dub.
B. heart murmur.
C. major heart defect.
D. atherosclerosis.
Answer: B
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The bird with the largest wings, also a marine bird, is called the:
a. frigate bird. b. pelican. c. albatross. d. gull. e. cormorant.
Once a gene has been cloned, it can be used for
A. disease diagnosis. B. detecting heterozygotes in the population. C. making biosynthetic products for commercial use. D. all of these. E. none of these.
The bulbourethral glands secrete a fluid containing fructose and prostaglandins. Indicate whether the statement is true or false
Which of the following best illustrates the first law of thermodynamics by Niagara Falls?
a. Water at the top of the falls has high kinetic energy; as the water moves over the waterfall, its kinetic energy is converted into potential energy; when the water reaches the bottom of the waterfall, its potential energy is transformed into other types of energy: heat, sound, and mechanical energy. b. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is transformed into other types of energy: heat, sound, and mechanical energy. c. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is transformed into potential energy again. d. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is lost.