Which Statement About MRNA Stability Is TRUE

question 1

Multiple Choice

Which statement about mRNA stability is TRUE?

• A) Degradation always proceeds in the 5' to 3' direction.
• B) Degradation of mRNA by polynucleotide phosphorylase yields 5'-nucleoside monophosphates.
• C) In general, bacterial mRNAs have longer half-lives than do eukaryotic mRNAs.
• D) Rates of mRNA degradation are always at least 10-fold slower than rates of mRNA synthesis.
• E) Secondary structure in mRNA (hairpins, for example) slows the rate of degradation.

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Definitions:

Jointed Appendages

Refers to appendages with joints, enabling movement, commonly found in arthropods such as insects, spiders, and crustaceans.

Nematocysts

Specialized cells in cnidarians, such as jellyfish, that eject a stinging thread for capturing prey or defense.

Cnidarian

Radially symmetrical invertebrate with two tissue layers; uses tentacles with stinging cells to capture food.

Cnidocyte

Stinging cell unique to cnidarians.