How many different tripeptides can be made from one unit each of the three amino

Question

How many different tripeptides can be made from one unit each of the three amino acids methionine, valine, and phenylalanine? Write the sequences of these tripeptides, using the three-letter abbreviations Met, Val Phe (II) An alpha-helix and a pleated sheet are examples of which level of protein structure? A) Primary B) Secondary C) Tertiary D) Quaternary E) None of these (III) The peptide bond between amino acids found in proteins is what type of functional group? A) Ester B) Ketone C) Ether D) Alkene E) Amide The action of enzymes is explained with the induced-fit model. In this model, the reacting substance or _____, attaches to an area of the enzyme called the _____ A) protein, complex site B) substrate, active site C) coenzyme, apoenzyme D) active site, substrate E) allosteric site, inhibitor

Explanation / Answer

2 i) it can be 6 types. One amino acid reacts with other amino acid and gives you peptide chain. a) Met-Val-Phen b)  Met-Phen-Val c) Val-Met-Phen d) Val-Phen-Met e) Phen-Met-Val f) Phen-Val-Met

ii) alpha helix (-helix) is a general example the secondary structure of proteins

iv) the reacting substance is called as substrate and the enzye have active sites to hold the substrate. So the answer is b) substrate, active site

iii) pepide bond is forms when acid part of amino acid react with amine of other amino acid. The bond between amino acid is AMIDE bond.

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