BIOL 4320, Sadana Worksheet Chapter 2, 3 and 4 1. For each of the following poly
ID: 187880 • Letter: B
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BIOL 4320, Sadana Worksheet Chapter 2, 3 and 4 1. For each of the following polymers listed in Table below indicate which of the properties (A to I) apply. More than one property can applied for an individual polymer. A. Extracellular location B. Glyosidic bond C. Informational molecule D. Peptide bond E. Phosphodiester bond F. Nucleotide triphosphate G. Synthesis by condensation H. Synthesis requires a template I. Helical structure possible Cellulose Globular proteins mRNA DNA Fibrous proteins 2. Amino acids tend to be localized either in the interior or on the exterior of a globular protein molecule, depending on their relative affinities for water. For each of the following pairs of amino acids, choose the one that is more likely to be found in the interior of a protein molecule and explain why? A. Alanine: Glycine B. Phenylalanine: Tyrosine C. Glutamate: Aspartate D. Methionine: CysteineExplanation / Answer
1)
2) In a protein, Hydrophobic amino acids will be usually burried into the proteins interior while hydrophilic amino acids are present on the surface of a protein chain.
The amino acids in each case that are burried interiorly in protein chain (ie., hydrophobic) are,
a) Alanine - Glycine is the simplest amino acoids where the R group ( Variable group) is Hydrogen itself. In alanine, this H atom is replaced by a methyl group ( CH3). The presence of methyl group ( Aliphatic group) offers hydrophobicity to a protein.
b) Phenyl alanine- Both phenyl alanine and tyrosine are aromatic and hydrophobic. But, when comparing these two, tyrosine is less hydrophobic due to the presence of an exocyclic hydroxyl group while, the presence of a benzene ring offers strict hydrophobicity to phenyl alanine.
c) Glutamate - Both aspartate and glutamate are hydrophilic in nature due to their negatively charged groups. But, while comparing these two, glutamate is more hydrophobic due to an extra methyl group.
d) Methionine- It is because, methionine comes under aliphatic group because of the presence of methyl groups. Thiol group is also present. But, in case of cysteine, it is hydrophilic because of its sulphydril group.
POLYMERS PROPERTIES THAT APPLY Cellulose Extracellular location, Glycosidic bonds, Condensation reaction Globular protein Extracellular location, petide bond,synthesise by condensation, synthesis requires a template, Helical structure possible mRNA Glycosydic bond, Informational molecule, phosphodiester bond, nucleotide triphosphate, synthesize requires template, helical structure possible DNA Glycosidic bond, informational molecule, phosphodiester bond, nucleotide triphosphate, synthesise requires template, helical structure possible Fibrous protein Extracellular location, peptide bond, synthesize by condensation, synthesize requires a template, helical structure possibleRelated Questions
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