Multiple choices: (t point each) 1. Grouping of amino acids is based on the rmit
ID: 147493 • Letter: M
Question
Multiple choices: (t point each) 1. Grouping of amino acids is based on the rmito group b. carboxyl group c. H group d. secondary structure R-group (side chain) e. 2. The C-terminal of a polypeptide has a (an) a. carboxyl group b. amino group c. hydrogen atom d. hydroxyl group e. keto group 3. A disulfide bridge can form between a. two glycine amino acids b. two cysteine amino acids two proline amino acids c. d. two hydrophobic amino acids e. any amino acids An ionic bond can form between two hydrophobic amino acids 4. a. two polar amino acids two oppositely charged amino acids b. c. any amino acids Which of the following statements about carboxyl group is true? a d. 5. it has the chemical formula-NH2 b. it is a basic group it is an acidic group c. d. it is a neutral group 6. Which of the following proteins has quaternary structure? a. a protein with 4 amino acids b. a protein with 4 hydrophobic amino acids a protein with 2 polypeptides c. d. a protein with 4 disulfide bridges -helices and -sheets are examples of a protein's a. primary structure b. secondary structure c. tertiary structure d. quaternary structure e. all of these In a polypeptide, amino acids are joined by the 7, 8. a. hydrogen bond c. hydrophobic interaction d. disulfide bridge e. peptide bond The primary structure of a protein isExplanation / Answer
Answer:
1). e. R-group (side chain)
Explanation:
Classification of amino acids is based on the type of the amino acid side chain.
2). a.carboxyl group
Explanation. Each amino acid consits of two terminals. One each C-terminal, which consists of carboxyl group and another is N-terminal, which consists of amino group.
3). b. two cysteine amino acids
Explanation:
Disulfide bond forms between sulfur containing amino acids. There two amino acids that contain sulfur, cysteine and methionine. So disulfide bond forms any of the two sulfur containing amino acids.
4). c. two oppositely charge amino acids
Explanation:
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions.
5). c, it is an acidic group
Explanaiton:
Carboxylic group is acidic and amino group is basic group.
6). c. a protein with 2 polypeptides
Explanation:
Quaternary structure of proteins is made up of two or more polypeptide chains. It refers to the specific orientation of these chains with respect to one another and the nature of the interactions that stabilize this orientation.
7). b. secondary structure
Explanation:
Secondary structure describes the alpha-helices and beta-sheets that are formed by hydrogen bonding between backbone atoms located near each other in the polypeptide chain.
8). e. peptide bond
Explanation:
A bond is formed between the amino group of one amino acid and carboxylic group of other amino acid is called peptide bond.
7).
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