a. A tetrapeptide is abbreviated as PSQE. Write the name of the amino acid at the N-terminal end. b. A tetrapeptide is abbreviated as FRWL. Write the name of the amino acid at the C-terminal end.

Can you explain the various options and how did you come to the answer? How to identify them when they are like that?

Which of these amino acids is a polar, uncharged amino acid? (Select all that apply, if necessary.) A. B. D. E. CHLO H₂N-CH-C CH₂ CH₂ CH₂ NH C=NH2 NH₂ amino acid A amino acid C amino acid D amino acid B amino acid E H₂N-CH-C CH₂ _i_g C. H₂N-CH-C- CH2₂ I CH₂ =0 NH₂ H₂N-CH- CH₂ CH-CH3 CH3 H₂ND H₂N-CH- | CH₂ Ï OH

Amino acid sequence in a protein that can form N-glycosylation is called a glycosylation sequon. Which of the following is such a sequon? a. Asn-Ala-Thr b. Gln-Ala-Thr c. Asn-Pro-Pro d. Asn-Ala-Ala e. Gln-Ala-Ala

Finally, the researcher incubates the peptide with chymotrypsin for two hours at 10 °C and analyzes the products using chromatography. Complete chymotryptic digestion of the peptide with chymotrypsin followed by chromatography yields free tyrosine and free leucine, plus a tripeptide containing Phe and Gly in a 1:2 ratio. Give the final sequence for the peptide based on the results of the acid hydrolysis, dansyl chloride reaction, and chymotryptic digestion. Use the three-letter amino acid abbreviations separated by hyphens for your answer. peptide sequence:

Draw a peptide with 2 or 3 amino acids from the name Emily

A. Where would you expect valine, leucine, and isoleucine to be located in a polypeptide?  (Inside or outside)?  Explain your answer using the properties of the amino acids listed.   B.How would your answer change, if  the amino acids were Lysine and Histidine?

Identify the base shown below. Drag the correct base to the rectangle in the image O I HN H₂N Adenine Cytosine N N IZ 5 methyl cytosine H Guanine Thymine

Your friend has discovered a protein that they suspect is glycosylated. They decide to perform a series of tests to determine the nature of the oligosaccharide. Assuming/Knowing the following: Fucose molecular weight is approximately 164 Galactose molecular weight is approximately 180 GalNAc molecular weight is approximately  221 Mannose molecular weight is approximately 180  Sialic Acid molecular weight is approximately 309 Neuraminidase cleaves before a Sialic Acid (Sialic Acid and anything after leaves the protein) Beta-galactosidase cleaves after a Galactose (Galactose and anything before remains on the protein) Peanut Agglutinin binds to GalNAc Concanavalin A binds to Mannose Hemagglutinin binds to Sialic Acid Based on preliminary results, they suspect that the oligosaccharide is 7 glycosides long and weighs a total of 1414 g/mol They carried out the following experiments: they treated the protein with either a glycosidase or a lectin, and then pelleted the protein using…

HOW MANY DIFFERENT PROTEINS CAN BE CONSTRUCTED THAT ARE EXACTLY FOUR AMINO ACIDS LONG? (HINT: THERE ARE 20 POSSIBLE AMINO ACIDS.)