The corkscrew movement of spirochetes is due to
a. cryptic motility.
b. polar flagella.
c. cilia.
d. endoflagella.
Answer: D
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Fast and ____________________ muscle fibers contract rapidly but do not produce sustained contractions, whereas slow and ____________________ muscle fibers contract slowly but can produce energy for long periods of time via aerobic respiration
Fill in the blank(s) with correct word
Increased carbon dioxide concentrations may contribute to
a. ozone depletion. b. global warming. c. eutrophication. d. groundwater contamination. e. biomagnification.
Four of these statements about conifers are true. Which one is the exception?
A. They form seeds in female cones. B. They have needlelike and scale-like leaves. C. They have a thick cuticle. D. They have motile sperm. E. They are mostly evergreen.
The movement of sucrose and H+ into the cell by the same membrane protein reflects the actions of what type of transporter?
A. symporter B. mechanosensitive channel C. voltage-gated channel D. antiporter E. uniporter