CELL BIOLOGY. Below are mutliple choice questions. Don\'t mind the circled answe

Question

CELL BIOLOGY. Below are mutliple choice questions. Don't mind the circled answers. Please provide me with the correct answers and maybe a little explanation as to why you chose that one Thank you SOOO MUCH!!

What are each of the membranes? Choose from:

a) cholesterol

b) sphingosine

c) sphingomyelin

d) phosphatidylserine

e) glycolipid

37. What would happen to a lysosomal enzyme if its gene was engineered to add the KDEL sequence? a. It is retrieved and transported back to the ER. b. It is not sent to sosomes, but it is brought back to the nucleus. c. t would be concentrated in the Golg d, t would be released from the cell by exocytosis. e. The final destination of the protein would NOT change

Explanation / Answer

37. The answer is: a. It is retrieved and transported back to the ER.

Any protein with attached KDEL sequence will be retrieved and transported back to the ER. KDEL is ER localization signal.

31. The answer is: Laser tweezers

With laser tweezers highly focused laser beams provide a attractive force to hold microscopic objects like tweezers.

29. The answer is: b. endoplasmic reticulum

Since the protein to be localized to the plasma membrane first pass through the ER to Golgi, so the radioactive plasma protein will be first observed in ER.

Figure 1:

1. - d. Phosphatidylserine

2. - a. Cholesterol

3. - e. Glycolipid

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