The systems that work together to protect the body are
A. nervous and endocrine.
B. skeletal and muscular.
C. digestive, respiratory, and circulatory.
D. integumentary, immune, and urinary.
E. reproductive and respiratory.
D. integumentary, immune, and urinary.
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Following the citric acid cycle but before the electron transport chain and oxidative phosphorylation, most of the energy from the original glucose molecule is found in ________
A. acetyl-CoA B. CO2 C. pyruvate D. NADH E. ATP
A gene for sweat gland production is found on the X chromosome. If a man who lacks sweat glands marries a woman who has normal sweat glands, what will be the phenotype of their children?
A. All of the boys will lack sweat glands. B. All of the girls will lack sweat glands. C. The girls will have sweat glands in some areas, but lack sweat glands in others. D. All of the boys will have sweat glands. E. All the boys will have sweat glands, and the girls will have sweat glands in some areas but not others.
The pair of traits that best illustrates convergent evolution is
A. a cartilage skeleton in a shark and a bone skeleton in a dolphin. B. an elephant's tusks and a beaver's teeth. C. a lizard's arm and a bird's wing. D. a dragonfly's wing and a butterfly's wing.
A urine sample collected directly from the urinary bladder
A) is sterile. B) contains fewer than 100 pathogens/ml. C) contains fewer than 10,000 pathogens/ml. D) contains more than 100,000 pathogens/ml. E) has leukocyte esterase.