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.)
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?
What nutritional hazard to human health is present in beef but not cocoa butter or coconut oil?
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
Which of the amino acids, threonine and leucine, would you expect to find on the inside of a globular protein and which would you expect on the outside, if either? Why?
Draw the structural formulas for threonine, methionine and Thr-Met.
Alanine has an R-group structure of CH3, cysteine has an R-group structure of HS-CH2, and aspartic acid has an R-group structure of HOOC-CH2 Write out the structural formula for this tripeptide, asp-ala-cys. Is the tripeptide basic, acidic, or neutral? How can you tell?
A direct current was passed through a solution containing alanine, histidine, and aspartic acid at a pH of 6.0. One amino acid migrated to the cathode (+) and one migrated to the anode (-) and the other remained stationary. Match the behavior with correct amino acid. The isoelectric point of histidine is 10.0.
Can there be a secondary structure without a primary structure? Why or why not? Can there be a primary structure without a secondary structure? Why or why not? What types of bonds are responsible for the secondary structure of a protein? How would the addition of a heavy metal affect the secondary structure of a protein?
Glucagon His-ser-glu-gly-thr-phe-thr-ser-asp-tyr-ser-lys-tyr-leu-asp-ser-arg-arg-ala-gln-asp-phe-val-gln-trp-leu-met-asn-thr Which of the amino acids in the molecule would you expect to be on the inside of the protein? Why?
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?
I would like an explanation on the important role aromatic compounds play in biological systems.
What is electron transport?
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
What is the net total charge on the following protein at pH7 and at pH2? Two answers Lys-Glu-Phe-Lys
Compare and contrast coenzyme vs cofactor vs apoenzyme.
Why must the fumaric acid produced in step 6 of the citric acid cycle have a trans double bond to continue in the cycle? Why can't the corresponding cis double bond isomer continue in the cycle?
If 22% of the nucleotides of a DNA molecule are deoxyadenosine and during replication the relative amounts of available deoxynucleoside triphosphates are 22% dATP, 22% dCTP, 28% dGTP and 28% dTTP, which will be limiting to the replication?
Consuming too many carbohydrates causes deposition of fats in adipose tissue, how can this happen and why aren't the molecules stored in glycogen instead?
If you were to destroy all the ATP in a cell how would it affect osmosis, diffusion and active transport?
Convert the following piece of DNA into a protein. A T C T G T G C C C A A G A T A T C
Which amino acid side chain is most frequently involved in denaturation by reduction?
Draw the structural formulas for pentose and hemiacetal.
Are the following questions true or false? a) A carboxylic acid favours the ion form (R-COO-) and its pH is higher than its pKa. b) In most membranes, the polar heads of the phospholipids align towards the middle of the membrane. c) All proteins contain either an alpha helix or beta sheets.
Are the following statements true or false? If false, explain why. a) In most globular proteins, the nonpolar amino acids tend to be concentrated at the surface of the protein. b) A small organic molecule required by an enzyme in order for the enzyme to be a functional catalyst is known as a vitamin. c) Lipids that are
Explain how non-polar solvents can denature proteins.
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
How will biodegradable plastic that imitates bacteria be beneficial?
How do you tell the difference between the non-polar R group and the polar but neutral R group?