Which statement is true for scyphozoan medusae?
(a) They are the dominant body form.
(b) They are generally smaller than hydrozoan medusae.
(c) Most live in freshwater.
(d) They are scavengers.
(a) They are the dominant body form.
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Which of the following is an interaction that stabilizes the three-dimensional structure of DNA?
A. planar nature of bases due to resonance B. tautomerism of the bases C. absorbance of UV light D. hydrophobic stacking E. repulsion between the negatively charged phosphate groups of the DNA backbone
Skeletal muscles make up approximately
____% of the body weight of a young man of average fitness.
a. 15 b. 20 c. 25 d. 30 e. 40
Viruses that infect bacteria are specifically called ________.
A. prions B. satellite viruses C. viroids D. bacteriophages
Trichinosis is a ________-caused disease that can be acquired by eating undercooked ________.
A. rotifer; hamburger B. segmented worm; eggs C. roundworm; chicken D. flatworm; chicken E. roundworm; pork