Protein Synthesis and Targeting

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Which of the following mechanisms is responsible for transporting proteins into the nucleus?

Transport vesicles

Nuclear transport receptors (correct)

Protein translocation channels

Protein translocators

What is the primary function of the signal sequence in protein synthesis?

To target the protein to its correct destination (correct)

To facilitate folding of the protein

To enhance protein stability

To regulate gene expression

Which type of molecule is prevented from entering the organelle due to its impermeable membrane?

Hydrophilic molecule

Hydrophobic molecule (correct)

Polar molecule

Amino acid

What is the purpose of the nuclear localization signal in proteins?

To mark the protein for nuclear transport Signup and view all the answers

Which of the following structures is involved in transporting proteins out of the ER?

Transport vesicles Signup and view all the answers

What is the typical length of the signal sequence in proteins?

15-60 amino acids Signup and view all the answers

Which of the following proteins plays a crucial role in the recognition process during vesicle transport?

Rab proteins Signup and view all the answers

What type of bond is introduced during protein modification in the ER?

Disulfide bond Signup and view all the answers

What is the primary function of SNARE proteins in vesicle transport?

To direct vesicles to the target membrane Signup and view all the answers

What is the term for the process of adding a 14-sugar chain to specific amino acid residues during protein modification?

Glycosylation Signup and view all the answers

What is the purpose of the recognition sequence in protein modification?

To specify the sites of glycosylation Signup and view all the answers

What is the term for the proteins that facilitate vesicle-membrane binding during vesicle transport?

Tethering proteins Signup and view all the answers

What determines the direction and orientation of a multi-pass transmembrane protein in the ER?

Start-Transfer-Signal Signup and view all the answers

What is the function of the second signal in the integration of a multi-pass transmembrane protein into the membrane?

Causing the protein to be released into the membrane Signup and view all the answers

What is the purpose of glycosylation in the ER?

To modify proteins before they leave the ER Signup and view all the answers

What is the difference between Start-Transfer-Sequences and Stop-Transfer-Sequences?

Start-Transfer-Sequences are for multi-pass transmembrane proteins, while Stop-Transfer-Sequences are for single-pass transmembrane proteins Signup and view all the answers

What is the result of a protein having multiple Start-Stop-Sequences in its sequence?

The protein will be integrated into the membrane multiple times Signup and view all the answers

What is the primary location of protein synthesis in eukaryotic cells?

Cytosol Signup and view all the answers

Protein Synthesis and Targeting

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