i g can be found on ell membrane? (a) phospholipids (b) proteins (d) all of the
ID: 280563 • Letter: I
Question
i g can be found on ell membrane? (a) phospholipids (b) proteins (d) all of the above (c) glycolipids 2. The presence of phospholipids with increased number of double bonds will fluidity? membrane (b) decrease (a) increase (c) have no effect on 3. Decreased cholesterol in the phospholipid bilayer will membrane fluidity? (b) decrease (a) increase (c) have no effect on 4. Which of the following is NOT required for protein transport into the nucleus? (a) Ran GTPase (b) SRP receptor (c) nuclear pore complex (d) nuclear localization signal 5. Which of the following is required for protein transport into the ER? (a) SRP (c) protein translocator SRP receptor (d) all of the above 6. Which of the following is not required for protein transport into the mitochondria? (c) import receptor (a) signal sequence (b) Ran GTPase (d) protein translocator 7. Transport of a soluble protein into the lumen of the ER does not require which of the following? (a) protein translocator (b) start transfer sequence (c) stop transfer sequence (d) signal peptidase 8. Transport of a multi-pass transmembrane protein into the ER differs from the transport of a single pass transmembrane protein in which of the following criteria? (a) protein translocator (b) start transfer sequence the location of the start transfer sequence (d) the location of the stop transfer sequence 9. Selection of cargo into transport vesicles requires which of the following proteins or structures? (a) dynamin (b) clathrin coat (c) adaptin (d) cargo receptorExplanation / Answer
Answer=
2.The presence of phospholipids with increased number of double bonds will increase membrane fluidity.
a]Increase
explaination- If unsaturated fatty acids are compressed ,the "kinks"in their tails push adjacent phospholipid molecules away,which helps maintain fluidity in the membrane.
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3]Decreased cholesterol in the phospholipid bilayer will Decrease membrane fluidity.
Answer = Cholesterol helps slightly the outer surface of the membrane & make it less soluble to very small water-soluble molecules that could otherwise pass through more easily.as cholesterol decreased membrane fluidity also decreased.
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4]The following is not required for protein transport into the nucleus
b]SRP receptor
Explaination- The signal recognition particle (SRP) is an abundant ,cytosolic ,ribonucleoprotein that recognises & targets specific proteins to the endoplasmic reticulum in eukaryotes & the plasma membrane in prokaryotes.
other i.e.Ran GTPase ,nuclear pore complex ,& nuclear localization signal are required for protein transport into the nucleus.
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5] The following is required for protein transport into the ER
b]SRP receptor
Explaination- The signal recognition particle (SRP) is an abundant ,cytosolic ,ribonucleoprotein that recognises & targets specific proteins to the endoplasmic reticulum in eukaryotes & the plasma membrane in prokaryotes.
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