Protein Metabolism

What is the primary function of amino acid metabolism?

• Break down amino acids to produce energy, synthesize new proteins, and eliminate excess nitrogen

• Convert amino acids into carbohydrates

• Store amino acids in the body for future use

• Regulate amino acid intake in the diet

Which process involves the conversion of amino acids into energy?

• Fermentation

• Anabolism

• Photosynthesis

• Catabolism

What is the role of tRNA in protein synthesis?

• tRNA acts as a catalyst in protein synthesis

• tRNA helps in cell division

• tRNA is responsible for DNA replication

• tRNA helps in bringing amino acids to the ribosome for protein synthesis.

What is the first step in protein degradation?

• Transport to the cell membrane

• Incorporation into a new protein

• Direct cleavage of the protein

• Recognition and tagging of the protein for degradation

Which enzyme is responsible for breaking down proteins into peptides?

• Lipase

• Cellulase

• Protease

• Amylase

How are enzymes involved in protein metabolism?

• Enzymes convert proteins into carbohydrates in protein metabolism.

• Enzymes build proteins from amino acids in protein metabolism.

• Enzymes break down proteins into amino acids through hydrolysis reactions in protein metabolism.

• Enzymes have no role in protein metabolism.

What is the significance of phosphorylation in the regulation of protein metabolism?

• Phosphorylation has a direct effect on DNA replication

• Phosphorylation leads to the degradation of proteins

• Phosphorylation regulates protein metabolism by modulating enzyme activity and protein interactions.

• Phosphorylation has no impact on protein metabolism

Which molecule acts as a key regulator of protein synthesis?

• transfer RNA (tRNA)

• ribosomal RNA (rRNA)

• messenger RNA (mRNA)

• deoxyribonucleic acid (DNA)

What is the function of proteasomes in protein degradation?

• Proteasomes transport proteins

• Proteasomes synthesize proteins

• Proteasomes degrade unneeded or damaged proteins.

• Proteasomes store proteins

How do allosteric enzymes regulate protein metabolism?

• By increasing the enzyme concentration in the cell

• By inhibiting the active site directly

• By promoting the breakdown of proteins

• By binding to specific molecules at sites other than the active site and causing a conformational change.