1. How do uncapping enzymes contribute to regulation of gene expression?
They promote degradation from the 3’ end of the mRNA.

They are part of the RNA editing machinery.

They are part of the spliceosome, regulating splice site choice.

They are endoribonucleases that digest mRNA from the middle of the molecule starting at an “A.”

They promote degradation from the 5’ end of the mRNA.
2. Which of the following statements about protein phosphorylation is TRUE?

Enzymes called kinases attach inorganic, soluble phosphate ions onto an amino acid

Phosphorylation of a protein could activate or inactivate a protein

In eukaryotes, only serine, threonine, and tryptophan can be phosphorylated

Phosphorylation of a protein always activates its function.
3. Of the following choices, which would you predict is most efficient at promoting mRNA degradation?

Double stranded RNA with one strand that is complementary to a portion of the mRNA you want to degrade

Double stranded DNA with one strand that is complementary to a portion of the mRNA you want to degrade

Single stranded RNA that is complementary to the RNA you want to degrade

Single stranded RNA that is identical in sequence to the mRNA you want to degrade

Single stranded RNA that is almost but not completely complementary to the RNA you want to degrade

Respuesta :

Uncapping enzymes promote degradation from the 3' end of the mRNA, whereas phosphorylation occurs in serine, threonine, and tryptophan and activates/deactivates.

What is phosphorylation?

Phosphorylation is a posttranslational modification of proteins in which a phosphate group is added by specific protein enzymes called kinases.

Phosphorylation can both activate and deactivate a protein depending on the specific substrate that is phosphorylated.

Moreover,  Double stranded RNA with one strand that is complementary to a portion of the mRNA you want to degrade is most efficient at promoting mRNA degradation.

In conclusion, uncapping enzymes promote degradation from the 3' end of the mRNA, whereas phosphorylation occurs in serine, threonine, and tryptophan and activates/deactivates.

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