10 Questions
Which of the endocytic pathways involves the ingestion of large particles or microorganisms and is performed mainly by specialized cells?
phagocytosis
Nuclear pores restrict larger molecules from traversing the membrane due to their
interwoven meshwork of protein fibrils.
Which of the following is a covalent modification that occurs mainly in the ER?
formation of disulfide bonds
Fully folded proteins can be transported into which of the following organelles?
nucleus
Lysosomes contain ____________ enzymes that can break down diverse macromolecules, cell parts, and microorganisms.
hydrolytic
How do clathrin-coated vesicles select their cargo molecules?
Cargo receptors bind specifically to cargo proteins and to clathrin.
Which of the following organelles is the site of steroid hormone synthesis in endocrine cells?
smooth endoplasmic reticulum
How are misfolded proteins and incompletely assembled proteins retained in the ER?
Chaperone proteins bind them and prevent their entry into vesicles.
Proteins encoded by nuclear genes and destined for the mitochondrial matrix are
in possession of a signal sequence for targeting to the mitochondria.
In which process do Rab proteins function?
cargo protein delivery
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