Enzymes called __________ form breaks in the DNA molecules to prevent the formation of knots in
the DNA helix during replication.
a. topoisomerases
b. single-strand binding proteins
c. DNA polymerases
d. RNA polymerases
e. DNA ligases
A
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The parasympathetic ganglia are arranged in an orderly chain along the spinal cord
Indicate whether the statement is true or false.
An anther is
a. composed of a stigma, a style, and an ovary. b. the mature male gametophyte. c. the site where microspores are produced. d. part of the vegetative phase of an angiosperm. e. none of these.
Refer to Table 19-1. If the expression of alleles is simple dominance (D) and recessive (d), then the
frequency of the recessive phenotype is: a. 0. b. 0.1. c. 0.2. d. 0.3. e. 0.5.
Classification of protozoans is based primarily on the type of motility observed in the trophozoite stage. Identification can also be made by
A) Examination of tissue specialization B) Examination of the cyst C) Determining a lack of nuclei D) Determining the level of multicellularity