Question

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2-3 sentences on why it is the correct answer for each, thank you !

15. Which statement below about the interconversion of the alpha and beta anomers of D-glucopyranose is true? The interconversion requires an enzyme called an isomerase The interconversion is spontaneous in water because the acetal functionality is labile The interconversion is spontaneous in water but is slow which is why we typically draw glucose having one anomeric form or the other The interconversion between anomeric forms of a glucopyranose at the reducing end of a di- or polysaccharide is prevented by the formation of the hemiacetal linkage The interconversion is spontaneous in water because the cyclic forms are in equilibrium with the open chain form During membrane signaling, such as the binding of insulin to its receptor binding of the ligand leads to 16. Opening of a channel to let insulin into the cll Opening of a voltage gated ion channel to let Ca2 into the ce A structural rearrangement that leads to release of cyclic AMP from the proteirn D. Dimerization of the protein to activate the tyrosine kinase domain Formation of 1,3,-bisphosphoglycerate to inhibit phosphofructokinase and slow down glycolysis 17. Many G-protein coupled receptors contain tyrosine kinases on their cytosolic domain, an example of which was the insulin receptor kinase. Which statement describes the action of the tyrosine kinase domain? This domain creates ATP from ADP and Tyr-OPO by substrate level phosphorylation B. This domain removes phosphate residues from tyrosine residue(s) on partner protein to which it is dimerized This domain uses ATP to put a phosphate group on a specific tyrosine residue on the protein molecule to which it is dimerized This domain uses cyclic AMP to transfer a phosphate group to its own tyrosine None of the above

Answer 1

15. which statements below about the interversion of the alpha nad beta anomers of D-glucopyranose is true?

D. The interconversion between anomeric forms of a glucopyranose at the reducing end of a di- or polysaccharide is prevented by the formation of the hemiacetal linkage.

Anomeric centre (alpha and beta) The anomeric centre of a sugar is a stereocentre created from the intramolecular formation of an acetal (or ketal) of a sugar hydroxyl group and an aldehyde (or ketone) group. The two stereoisomers formed from the two possible stereochemistries at the anomeric centre are calledanomers.

16.During membrane signaling, such as the binding of insulin to its receptor, binding of the ligand leads to....

D. Dimerization of the protein to activate the tyrosine kinase domain.

Receptor tyrosine kinases (RTKs) are a class of enzyme-linked receptors found in humans and many other species. A kinase is just a name for an enzyme that transfers phosphate groups to a protein or other target, and a receptor tyrosine kinase transfers phosphate groups specifically to the amino acid tyrosine.

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