Earthworms have a(n)
A) exoskeleton.
B) endoskeleton.
C) hydrostatic skeleton.
Answer: C
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Mycobacterium tuberculosis is very difficult to stain because of the
A) presence of ribosomes in the cytoplasm. B) location of the DNA within the cell. C) large amounts of a waxy lipid present in its cell wall. D) lack of a cell wall.
Flexible bacteria with a helical shape are called
A. coccobacilli. B. spirilla. C. spirochetes. D. vibrios.
Who am I? I typically have two flagella: one that wraps in a transverse groove and the other that
wraps in a longitudinal groove. a. green algae b. red algae c. euglenoids d. dinoflagellates e. brown algae
The existence of epigenetic effects suggests that
a. in violation of the central dogma, information can be transmitted from protein and incorporated into nucleic acid. b. covalent modification of DNA must not persist through replication. c. protein complexes associated with DNA must be assembled de novo following replication. d. proteins may have been the original genetic material. e. the protein(s) responsible must be self-assembling.