What amino acid side chains can be modified by methyl groups? What is unusual about methyl group addition compared to phosphate and acetyl addition to proteins?
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What amino acid side chains can be modified by methyl groups? What is unusual about methyl group addition compared to phosphate and acetyl addition to proteins?
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- 1. Why is cholesterol an important steroid?7. Native conformation of proteins may result from: a) hydrophobic interactions b) H-bonds c) ionic bonds d) covalent bonds e) all a-d may contribute to native conformation2. Which part of an amino acid gives it its unique identity? A. the long carbon-hydrogen tails of the molecule B. the carboxyl and amino groups C. the components of its side chain D. the glycerol molecule that forms the backbone of the amino acid
- 6 List some important types of molecular interactions involved in recognition and binding of polysaccharides and glycoconjugates.1. Draw three-dimensional representations of the following amino acids. Explain theirstructures.(a) L-phenylalanine(b) L-histidine(c) D-serine(d) L-tryptophan1. What kind of bond links a base to some sugar? Is the sugar an alpha or beta anomer? In what position(s) of the sugar does this occur? In what position(s) of the base does this occur?
- 8 What are the three components of anucleotide?2- Some proteins contain additional amino acids that arise by modification of an amino acid already present in a peptide , examples include: a) Gamma Amino Butyric Acid. b) 5 - hydroxy Lysine c) 4 - hydroxy proline d) All of the above e) None of the above1.What reactive groups are involved in the formation of a peptide bond?2.A molecule of what substance must be removed in order to form a peptide bond?