3. Determination of the three-dimensional structure of a membrane protein--that

Question

3. Determination of the three-dimensional structure of a membrane protein--that is, its topology-is generally much more difficult than determining its amino acid sequence sequencing. The amino acid sequences are known for thousands of membrane proteins, but relatively few three-dimensional structures have been established by crystallography or NMR spectr , either directly or by gene oscopy. a. True b. False Indicate the answer choice that best completes the statement or answers the question 4. The enzymes a-amylase and p-amylase can cleave the bonds of amylopectin but not the bonds. a. a (1-6)-; a (1-4)- 5. A cyclic hemiacetal with a six-membered oxygen-containing ring is referred to as a(n): c. ketopentose. a. aldehyde. d. furanose. b. pyranose. e. sorbitol. 6. Liposomes are all EXCEPT: a. used to introduce contrast agents into the body for diagnostic imaging procedures. b. able to fuse with cells. c. highly stable structures. d. possible to prepare with different inside and outside solutions. e. all are true.

Explanation / Answer

4.d. a(1-4) :a(1--6)

5. Pyranose (six membered oxygen containing ring)

6.highly stable structure

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