Dinoflagellates are best described as
A) protozoans that use cilia to move and feed.
B) a clade of protists including unicellular autotrophs, heterotrophs, and mixotrophs
C) parasitic diatoms that must spend part of their life cycles in vertebrate hosts.
D) large, multicellular algae that resemble plants but do not have true leaves, stems, or roots.
Answer: B
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A mutation that changes one particular amino acid into another can affect the functioning of other amino acids farther away in the primary sequence due to
A) the presence of prions. B) protein folding. C) jumping genes. D) the tendency for further mutations to occur.
Scientists at the Natural History Museum in London estimate that more than ____ percent of living
species have not yet been discovered.
a. 11 b. 27 c. 32 d. 56 e. 98
The ozone in the atmosphere can be damaged by which of the following?
A) carbon dioxide B) chlorine C) methane D) oxygen
In humans, fiber does all of the following EXCEPT
A. provide energy. B. prevent constipation. C. help control weight gain. D. prevent hemorrhoids.