Cilia and flagella of eukaryotic cells are composed of:
A. microtubules in a 9 + 2 arrangement.
B. protein fibers in a helical arrangement.
C. actin filaments in a 9 + 2 arrangement.
D. nine triplets of microtubules in a circle.
A. microtubules in a 9 + 2 arrangement.
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Plants and algae contain this organelle not found in heterotrophs:
a. nucleus. b. mitochondria. c. chloroplasts. d. flagella.
The volume of air in the lungs at rest, between breaths, is called
A) inspiratory reserve volume. B) vital capacity. C) inspiratory capacity. D) functional residual capacity. E) tidal volume.
A detectable variation in the genomes of different individuals of a population is known as:
a. DNA sequencing. b. DNA electrophoresis. c. DNA tandem repeats. d. a polymorphism. e. DNA profiling
How might anthropogenic enhancement of the greenhouse effect result in increased primary production?
A) Warmer temperatures would lengthen the growing season and speed metabolism. B) Enhanced CO2 concentrations would increase the rate of photosynthesis. C) both of the above