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Old 02-06-2012
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Question Biochemistry: Amino acids Q1

1. The following statement is characteristics for which of the amino acids?
“A hydrophilic amino acid that is a site for N-linked glycosylation of proteins and in association with endoplasmic reticulum”

A) Threonine
B) Aspartic acid
C) Lysine
D) Glutamine
E) Asparagine
F) Serine
--------------------------------------------------------

2. Which of the following amino acids are involved in O-linked glycosylation of proteins in association with Golgi apparatus?

A) Serine and threonine
B) Asparatate and glutamate
C) Cysteine and Arginine
D) Methionine and Arginine
E) Proline, Leucine and Isoleucine
F) Phenylalanine and Tyrosine
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Old 02-06-2012
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ans E .......

ans A ..........
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Old 02-06-2012
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WOW, i didnt know we needed to know on what specific amino acids these occur. Where can I find this info? I've read kaplan and they don't specify the amino acids.
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Old 02-06-2012
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U should look again there definitely about it in kaplan book
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Old 02-06-2012
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yes , its ther in kaplan , pg 117 2009 edition ...
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Old 02-06-2012
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correct answers:
1- e)
2- a)


Five classes of glycans are produced:
N-linked glycans attached to a nitrogen of asparagine or arginine side-chains
O-linked glycans attached to the hydroxy oxygen of serine, threonine, tyrosine, hydroxylysine, or hydroxyproline side-chains, or to oxygens on lipids such as ceramide
phospho-glycans linked through the phosphate of a phospho-serine;
C-linked glycans, a rare form of glycosylation where a sugar is added to a carbon on a tryptophan side-chain
glypiation, which is the addition of a GPI anchor that links proteins to lipids through glycan linkages.



Quote:
Originally Posted by medhelp View Post
U should look again there definitely about it in kaplan book

yes its mentioned in translation biochem chapter and also mentioned in lectures...
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Old 02-06-2012
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Perfect but I st forget these things
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Old 02-07-2012
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I had just read it yesterday and still got confused
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