The cell membranes of wall-less archaeons are strengthened by ________.
A. lipid-containing polysaccharide
B. caldarchaeol
C. glycoproteins
D. All of the choices are correct.
Answer: D
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All of the following circular DNAs exhibit theta replication except
A) bacteria. B) mitochondria. C) chloroplasts. D) plasmids. E) protists.
Which statement about agricultural diversity is true?
a. The loss of wild crop species hinders the development of new crop varieties. b. Wild crop seeds cannot be bred with existing varieties of crop seeds. c. Modern pesticides effectively kill pest species while protecting non-pest species. d. A single pest enemy species is more effective at pest control than multiple species.
The amount of air that enters and leaves the lungs with each breath is the ____
a. respiratory volume b. respiratory rate c. vital capacity d. tidal volume e. inspiratory volume
Pseudocoelomates have a body cavity that is not completely lined with __________. These animals
include __________ and roundworms. a. endoderm; nemerteans b. endoderm; flatworms c. mesoderm; rotifers d. mesoderm; flatworms e. mesoderm; nemerteans