Post-Translational Modifications Quiz

Which target residues can undergo phosphorylation?

• Serine, Threonine, Tyrosine

• Lysine, Arginine, Histidine

• Glycine, Alanine, Valine

• Aspartic Acid, Glutamic Acid, Cysteine

What is the enzyme that reverses protein phosphorylation?

• Protein Kinase

• Protein Phosphatase

• Proteasome

• Ubiquitin Ligase

Which enzyme is responsible for histone acetylation?

• Histone Acetyltransferase (HAT)

• Histone Deacetylase (HDAC)

• Prolyl 3-Hydroxylase

• Prolyl 4-Hydroxylase

What is the impact of histone acetylation on gene transcription?

• Increases transcription

• Decreases transcription

• No effect on transcription

• Inhibits RNA polymerase

Which target protein undergoes lysyl hydroxylation?

• Collagen

• Histone

• Hemoglobin

• Fibrinogen

What is the cause of scurvy?

• Vitamin D deficiency

• Vitamin C deficiency

• Iron deficiency

• Calcium deficiency

Which target proteins undergo carboxylation?

• Blood clotting proteins

• Cell surface glycoproteins

• Secreted proteins

• Extracellular matrix proteins

What is the function of protein carboxylation?

• Blood clotting

• Membrane targeting

• Molecular recognition

• Gene transcription

Which type of glycosylation occurs in the Golgi?

• O-linked glycosylation

• N-linked glycosylation

• Both O-linked and N-linked glycosylation

• Neither O-linked nor N-linked glycosylation

What is the physiological function of lysine 48-linked polyubiquitination?

• Protein degradation

• Membrane targeting

• Gene transcription

• Cell signaling