Which microscope is used to see detail of a 300-nm virus?
A) fluorescence microscope
B) phase-contrast microscope
C) darkfield microscope
D) DIC microscope
E) electron microscope
E
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In vertebrates, external fertilization (select all correct choices):
A. is common among mammals. B. cannot occur in marine (salt water) conditions. C. is found in some fish and amphibians. D. involves releasing gametes directly into a wet environment. E. is a form of asexual reproduction.
The gaseous plant hormone is
a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.
Mutagens that can cross the placenta of a pregnant woman and cause a spontaneous abortion or birth defects in the fetus.
What are bacterial capsules usually composed of?
A) Repeating phospholipids B) Repeating amino acids and/or salts C) Repeating polysaccharide molecules and/or proteins D) Repeating monosaccharide molecules and/or hydrophilic molecules