compound can be found with a tyrosyl unit?

Which of the following statements regarding the nitrogenous base guanine is FALSE? A) ALL of these statements are TRUE B) the enol form of guanine base-pairs with thymine C) guanine undergoes a tautomeric shift between a keto and an enol form D) the keto form of guanine base-pairs with cytosine E) an alcohol (-OH) group is present in guanine's enol form, but absent in the keto form F) guanine’s keto form is more stable than its enol form

Please indicate the coordination geometry for the Heme A in the picture. A) tetrahedral B) octahedral C) square planar D) trigonal planar E) linear

1. A) Draw a guanylate nucleotide and label the three main structural features B) Does this contain a purine or pyrimidine base? C) Would this nucleotide be found in DNA or RNA? Why? D) To which carbons of the furanose sugar are the other important structural features attached? E) Draw an adenylate residue bonded to the guanylate from below as it would be in a nucleic acid chain F) Label the phosphodiester bond G) Label which side of your dinucleotide is the 5' and 3' side H) Draw the nucleotide residues that base pair with guanylate and adenylate in the position and location that would permit pairing 1) Draw the hydrogen bonds that occur in both pairings.

Deduce the amino acid sequence of a polypeptide from the following:1. Acid hydrolysis gives Ala2, Arg, Lys2, Met, Phe, Ser22. Carboxypeptidase gives Ala3. Trypsin digestion gives 4 peptides        a) Ala, Arg        b) Lys, Phe, Ser        c) Lys        d) Ala, Met, Ser4. CNBr treatment gives        a) Ala, Arg, Lys2, homoserine, Phe, Ser        b) Ala, Ser5. Thermolysin is a protease that cuts on the N-terminal side of hydrophobic amino acids (substrate preference is Leu, Ile, Phe, Trp, Tyr, Val).  Thermolysin treatment of our polypeptide yields 2 peptides        a) Ala, Arg, Ser        b) Ala, Lys2, Met, Phe, Ser

Which is true of reducing disaccharidess:   a) One sugar has an unlinked anomeric carbon   b) the anomeric carbons of both sugars are linked  c) both sugars are ketoses  d) one sugar is a ketose and the other is an aldose Amylose differs from amylopectin in that amylose is: a)  branched   b)   unbranched    c)   required in the diet    d)  found only in bacteria The structure of glycogen most closely resembles that of: a)  cellulose   b)    amylose   c)   amylopectin   d)  egg albumin The structure of cellulose differs from that of amylose in which way? A) cellulose uses fructose while amylose uses glucose   b) cellulose has branches while amylose does not    c)  amylose has branches while cellulose does not   d) cellulose has beta-links while amylose has alpha links The following sugar is commonly found in nature: a) L – fucose   b)   L-glucose   c)   L-ribose   d)  L – galactose Hyaluronic acid is classified as a: a) peptidoglycan   b)  ketohexose    c) glycosaminoglycan   d)…

Which of these is not a component of phosphatidylcholine?  a)  glycerol   b)  phosphate  c)  choline   d)  sphingosine

Which of the following describes a purpose for the function of phosphoglucoisomerase? a) allows for phosphorylation for trapping the molecule in the cell b)promotes substrate level phosphorylation and formation of ATP c) allows formation of a primary alcohol necessary for the next step of phosphorylation d)facilitates epimerization, the change in stereochemistry at one chiral carbon

In observing a Haworth or cyclohexane-chair representation of alpha-d-glucopyranose, the anomeric carbon can de best identified by: a) the carbon atom which is bonded to the most H atoms b)  the carbon atom which is bonded to the least H atoms   c) The carbon atom which has its OH group pointing down   d) The carbon atom which is bonded to two oxygen atoms Cellulose differs from amylose in that: a) cellulose has 1-6 branches while amylose does not b)  amylose has 1-6 branches while cellulose does not   c)  amylose has alpha glycosidic bonds while cellulose has beta glycosidic bonds   d)  cellulose contains sulfate while amylose does not. The glycosaminoglycan (mucopolysaccharide) which is not normally associated with joint tissue is: a) heparin b)  keratan sulfate  c)  chondroitin sulfate   d)  hyaluronic acid In glycoproteins, which amino acid does not bond sugar molecules? a) Asn  b)  Ser  c)  Thr   d)  Gly Which feature do all lipid molecules share in common? a) fatty acid molecules…

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