ASU Cell BIO 353 Exam 3 SA Practice Questions and Answers
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Course
2024/2025
Institution
2024/2025
ASU Cell BIO 353 Exam 3 SA Practice
Questions and Answers
How do mitochondria get their lipids? Give a detailed answer. - Ans:-a. Lipids synthesized in ER
b. transported to mitochondria
c. switch of lipid takes place between ER and mitochondria & between mitochondrial membranes
d. Membrane-tet...
b. Water- pinocytosis - invagination forms around water, taken into cytoplasm through membrane
channels to avoid damaging cell if vesicle explodes- membrane "Straw" used to "sip" water
Explain how general food and food taken in by receptor mediated endocytosis merge with elements of
the endomembrane system to digest and absorb those nutrients (including cholesterol). - Ans:✔✔-a.
When a ligand binds to a receptor, receptor undergoes a conformational change.
b. Exposes binding site for adaptor protein AP-2
c. Capping occurs when same type of receptors bind to their ligands all over surface of cell come
together over small area; looks like baseball cap without the brim.
d. Adapter protein recruits triskelon to form clathrin coat
e. Receptor and ligand move using molecular motors
f. Amino acid subunits pumped into cytoplasm & indigestible components removed by exocytosis
Explain how membrane flow participates with membranes that are part of the endomembrane system,
but also part of the plasma membrane. - Ans:✔✔-a. Vesicular transport moves newly synthesized lipids,
transmembrane proteins, and luminal proteins within the endomembrane system.
b. Forms spherical vesicle
c. Vesicle is transported on microtubule pathway from ER to cis-face GA then move to cell periphery,
transfer to actin filament, and move to PM
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