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Biological Chemistry

DNA

The typical length of a DNA strand is 3.4cm. In order to fit into a cell, the DNA strand is supercoiled around proteins called histones. Histones are a family of five proteins thet are rich in the amino acids and lysine. How do histones stabilize the DNA strand? (look at the backbone of the DNA strand at the molecular level.)

Drawing Structures of Tetrapeptides

How to draw the structure of this tetrapeptide: Ala-Ser-Tyr-Thr What type of bonding between amino acid residues is most important in holding a protein and polypeptide in a specific secondary configuration?

Explanation for the Chemical Structure of Hydrocortisone

Can you please explain the chemical structure of cortisol and hydrocortisone? What is the difference on the structure? How many functional groups hydrocortisone has and what are they? What's in the chemical structure of hydrocortisone that makes it relieves the swelling and inflammation in the skin? Can you please explain

Are Albumins Polar or Nonpolar?

Blood is essentially an aqueous solution but it must transport a variety of non polar substances (hormones for example). Colloidal proteins, termed albumins, facillitate this transport. Must these albumins be polar or nonpolar?

Lidocaine and Bonding to Receptors

Draw abbreviated structural formulae of the products of the complete hydrolysis of lidocaine, and identity the functional groups from the first diagram attached. Lidocaine is thought to bond to receptors in its methylated form. Identify in writing the atoms or groups that could be involved in its bonding to a receptor via h

Construct Standard Curve And Identify Unknown Sample's Value

Construct a standard curve from a data set and find the concentration of an unknown sample. The following data was obtained using spectrophotometry: Absorb.----------- ug/ml protein 0--------------------------0 0.22--------------------100 0.098-------------------50 0.086-------------------25 0.038------------------12.5