Mutations that arise in nature, from no particular artificial agent, are called ________
A) cosmic mutations
B) spontaneous mutations
C) chromosomal aberrations
D) oblique mutations
E) induced mutations
B
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Old man's beard (Usnea trichodea) and yellow Evernia lichens are sensitive to elevated levels of ____
a. sulfur dioxide b. nitrogen oxides c. nitrate d. sunlight e. fluoride salts
Mammals are the only vertebrates that possess:
a. teeth b. a backbone c. a brain d. a four chambered heart e. mammary glands
__________ are fleshy, scaly stems that typically
grow under the soil and parallel to its surface. a. Stolons b. Rhizomes c. Bulbs d. Corms e. Tubers
Please place the following events in transcription in the correct order.
A.) RNA polymerase binds to the promoter region just upstream of the gene. B.) RNA polymerase moves along the template strand of DNA adding complementary RNA nucleotides, extending the mRNA. C.) RNA polymerase unwinds the DNA at the promoter site and begins to transcribe the template strand of DNA. D.) The mRNA transcript is released. E.) Transcription continues until a terminator site in the DNA is reached.