On paper draw a dipeptide, clearly showing the peptide bond joining the two amino acids together. If the two amino acids are valine and threonine, predict the overall charge of the dipeptide at pH 7. Do not forget to consider the amino (N-terminal) and carboxy (C-terminal) of the dipeptide, as well as the R groups.
Select one:
a. +2
b. -2
c. 0
d. -1
e. +1
The concept of peptide bond and the diagram is represented in the image below
To know the charge of the dipeptide, we have to calculate the pI (Isoelectric point) of individual amino acids. pI is the characteristic pH at which the net electric charge is zero.
pK values (of individual amino acids) are universal and constant. Now the concept is, any amino acid or peptide has a net negative charge above its pI and will move toward the positive electrode. In the question, the charge has to be found out at pH7. However, the pI of valine and threonine are less than ph7, which is why, they will possess (-1 for valine, -1 for threonine = -2) charge at pH7.
Therefore, the correct option is b. -2
On paper draw a dipeptide, clearly showing the peptide bond joining the two amino acids together....
HW Question: Draw the amino acids, lysine and valine joined by a peptide bond. Next, place a square around the peptide bond within the dipeptide molecule. Finally circle all the atoms which could interact with a water molecule.
19) The form of dipeptide aspatylserine (Asp-Ser) obtained from two amino acids, aspartic acid and serine, whose structures are shown here, is HiN-CH-C-0HIN-CH-C-0 CH2 CH OH aspartic acid serine A HN-CH-C-o-N-CH-C-o CH OH CH2 coo -(H-C-o-H-c-o CH OH CH2 HIN CH-C-N-CH-C-O CH OH CH H-CH-CH CH CH OH coo- 20) Where is the peptide bond located in this dipeptide? serine valine a) the CO-NH joining serine and the valine b) the doubly bonded oxygen just left of center between the...
Answer questions 7-8 please ! Draw a picture of two amino acids coming together to make a dipeptide. You may choose any two amino acids you like. Circle the peptide bond. What molecule is necessary to break a peptide bond?
1. Draw the dipeptide His-Gly at pH 7.4. 2. Label the amino terminus, the carboxy terminus, the two alpha carbons, and the peptide bond (1pt). 3. Calculate it’s net charge. 4. What is the net charge of this dipeptide at pH = 2? 5. List the levels of protein structure and the types of bonds/interactions that are characteristic of each level.
Glutamine, tyrosine, leuonine, phenyalanine, histine, methalonine Draw a peptide bond between two of the amino acids above and name the dipeptide bond you have drawn
A) Draw the dipeptide R-T at pH 7 and CLEARLY label the peptide bond to be broken in the presence of trypsin. 3pts B) Draw the five-step mechanism for the trypsin cleavage of the dipeptide. 5pts C) Label the transition state each time it is formed. 1pt D) What mechanism is used to describe this bisubstrate reaction? 1 pt
Draw the structure of the dipeptide Lys-Glu at pH 7.0. Label the following: a) Peptide bond b) N-terminus c) C-terminus d) An α-amino group and an ε-amino group e) An α-carboxylate group and a Y-carboxylate group Draw the structure of the dipeptide Lys-Glu at pH 7.0. Label the following: (a). peptide bond, (b). N-terminus, (c). C-terminus, (d). an a-amino group and an e-amino group, (e), an α-carboxylate group and a -carboxylate group.
Proteins are made from chains of amino acids. The amino acids are joined together by structures called peptide bonds. Draw the dipeptide that results when a peptide bond is formed between the two glycine molecules shown here. (Figure 1) Draw it as it would occur at the pHpH of most body fluids. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. Include all...
5a.) At the back of this paper is a list of L-amino acids. Using this list, draw a bond-line structure of the dipeptide His-Lys. In your answer you should: Clearly show the correct absolute stereochemistry Label the peptide bond Label the C and N termini (12 points) 5b.) Consider the compound shown below. How many signals would be observed in the 'H NMR spectrum of this compound. Clearly label the multiplicity of each proton set. Clearly label the signal that...
1. What amino acids do the following abbreviations stand for? Draw the structure of each. a) lle b) Thr c) Gin 2. Name and draw the structures of the amino acids that fit these descriptions: a) Contains an isopropyl group b) Contains a secondary alcohol group 3. Which of the following objects is chiral? a) A pair of scissors b) A comb c) A drinking glass 4. What does the term achiral mean? Give two examples involving organic structures.. 5....