18 Questions
Which of the following mechanisms is responsible for transporting proteins into the nucleus?
Nuclear transport receptors
What is the primary function of the signal sequence in protein synthesis?
To target the protein to its correct destination
Which type of molecule is prevented from entering the organelle due to its impermeable membrane?
Hydrophobic molecule
What is the purpose of the nuclear localization signal in proteins?
To mark the protein for nuclear transport
Which of the following structures is involved in transporting proteins out of the ER?
Transport vesicles
What is the typical length of the signal sequence in proteins?
15-60 amino acids
Which of the following proteins plays a crucial role in the recognition process during vesicle transport?
Rab proteins
What type of bond is introduced during protein modification in the ER?
Disulfide bond
What is the primary function of SNARE proteins in vesicle transport?
To direct vesicles to the target membrane
What is the term for the process of adding a 14-sugar chain to specific amino acid residues during protein modification?
Glycosylation
What is the purpose of the recognition sequence in protein modification?
To specify the sites of glycosylation
What is the term for the proteins that facilitate vesicle-membrane binding during vesicle transport?
Tethering proteins
What determines the direction and orientation of a multi-pass transmembrane protein in the ER?
Start-Transfer-Signal
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
What is the purpose of glycosylation in the ER?
To modify proteins before they leave the ER
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
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
What is the primary location of protein synthesis in eukaryotic cells?
Cytosol
This quiz covers the process of protein synthesis, specifically the mechanisms of protein targeting and transport into different organelles. Learn about the roles of signal sequences, nuclear pores, and protein translocators in this crucial cellular process.
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