Which of the following statements about RNA processing in eukaryotes is INCORRECT?
A. The excision of introns from pre-mRNA is the only modification required to produce a mature mRNA.
B. A protein/RNA complex is used to remove introns from the pre-mRNA.
C. A poly A tail is added on to the 3? end of the mRNA.
D. A 7-methylguanosine cap is added on to the 5?end of the mRNA.
E. Modification occurs in the nucleus.
A. The excision of introns from pre-mRNA is the only modification required to produce a mature mRNA.
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The __________ is a sedimentary cycle; Earth’s
crust is the largest reservoir, and there is no major gaseous form. Fill in the blank(s) with the appropriate word(s).
The dietary carcinogen aflatoxin can be found in
A) fresh fruits. B) red meats. C) salt. D) alcohol. E) raw peanut butter.
What is the role of the enzyme ligase in DNA replication?
A. It seals any breaks in the sugar-phosphate backbone. B. It breaks the hydrogen bonds that hold the two strands of the DNA together. C. It unzips the double-stranded DNA. D. It matches new bases to the old strand by complementary base pairing. E. It folds the DNA into a coiled structure.
Enzymes known as lyases participate in ________ reactions
A) anabolic B) catabolic C) both anabolic and catabolic D) neither anabolic nor catabolic E) oxidation-reduction