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Posttranslational Modifications of Polypeptide Chains

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Posttranslational Modifications of Polypeptide Chains

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Questions and Answers

Which process converts majority of proteins from the ribosome into functional proteins?

Covalent Modification

Trimming

Protein targeting

Folding (correct)

What is the function of signal sequences in proteins?

Initiating protein synthesis

Regulating protein folding

Directing proteins to their final locations (correct)

Activating protein degradation

What is the role of ubiquitination in posttranslational modifications?

Facilitating protein folding

Marking proteins for degradation (correct)

Enhancing protein activity

Initiating protein translocation

What can be added to a protein as part of covalent modification?

Carbohydrates Signup and view all the answers

What happens to signal sequences after the protein is translocated into the endoplasmic reticulum?

They are removed by signal peptidase Signup and view all the answers

What is the role of post-translational modifications in proteins emerging from the ribosome?

Convert them into functional proteins Signup and view all the answers

Which process involves marking proteins for degradation?

Ubiquitination Signup and view all the answers

What happens to the signal sequences in proteins after they are translocated into the endoplasmic reticulum?

They are removed by signal peptidase Signup and view all the answers

What is the primary function of protein targeting in posttranslational modifications?

Direct proteins to their final locations Signup and view all the answers

What type of changes can occur during covalent modification of proteins?

Amino acids might be changed, carbohydrates or lipids can be added, and protein activity can be altered Signup and view all the answers