A(n) ________ is composed of tetrameric protofilaments.
A) extracellular matrix
B) microtubule
C) bacteriophage
D) microfilament
E) intermediate filament
E) intermediate filament
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A group is considered paraphyletic if
A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. the common ancestor of the group is not included in the group. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
What is one difference between using restriction endonucleases and mechanical shearing of DNA?
A) Restriction endonucleases cut DNA at known specific sites while shearing occurs at random sites. B) Restriction endonucleases cut DNA at random sites while shearing occurs at known specific sites. C) DNA cut with restriction enzymes can be used for cloning and DNA broken by shearing cannot. D) Restriction enzymes produce larger fragments on average than shearing.
Horsetails belong to the phylum Pteridophyta
____________________ Indicate whether the statement is true or false.
The counterstain in the acid-fast stain is
a. A basic dye. b. An acid dye. c. A negative stain. d. A mordant. e. Necessary to determine acid-fast cells.