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13. The amino acids lysine and tryptophan are not found in many plants. Why is this of concern to vegetarians who consume no meat in their diet? a. Lysine and tryptophan are essential amino acids. b. The human body cannot synthesize these amino acids, and must get them from the diet. c. Since proteins are made from combinations of 20 different amino acids, people need all 20 amino acids. d. All of the above. 14. What level of protein structure is associated with the order in which amino acids are linked together in a protein? c. tertiary structure d. quaternary structure a. primary structure b. secondary structure 15. Which of the following describes the quaternary structure of a protein? a. the structure resulting from hydrogen bonding between the electronegative nitrogen and oxygen atoms and the partially positive hydrogen atoms b. the shape resulting from the union of more than one polypeptide chain c. the structure resulting from the bonding interactions between the side groups of the amino acids d. the sequence of amino acids linked together with peptide bonds 16. What is the difference between pyrimidine bases and purine bases? a. There are three types of pyrimidine bases (uracil, thymine, and nd quanine).

13. The amino acids lysine and tryptophan are not found in many plants. Why is this of concern to vegetarians who consume no meat in their diet? a. Lysine and tryptophan are essential amino acids. b. The human body cannot synthesize these amino acids, and must get them from the diet. c. Since proteins are made from combinations of 20 different amino acids, people need all 20 amino acids. d. All of the above. 14. What level of protein structure is associated with the order in which amino acids are linked together in a protein? c. tertiary structure d. quaternary structure a. primary structure b. secondary structure 15. Which of the following describes the quaternary structure of a protein? a. the structure resulting from hydrogen bonding between the electronegative nitrogen and oxygen atoms and the partially positive hydrogen atoms b. the shape resulting from the union of more than one polypeptide chain c. the structure resulting from the bonding interactions between the side groups of the amino acids d. the sequence of amino acids linked together with peptide bonds 16. What is the difference between pyrimidine bases and purine bases? a. There are three types of pyrimidine bases (uracil, thymine, and nd quanine).

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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13. The amino acids lysine and tryptophan are not found in many plants. Why is this of concern to vegetarians who consume no meat in their diet? a. Lysine and tryptophan are essential amino acids. b. The human body cannot synthesize these amino acids, and must get them from the diet. c. Since proteins are made from combinations of 20 different amino acids, people need all 20 amino acids. d. All of the above. 14. What level of protein structure is associated with the order in which amino acids are linked together in a protein? c. tertiary structure d. quaternary structure a. primary structure b. secondary structure 15. Which of the following describes the quaternary structure of a protein? a. the structure resulting from hydrogen bonding between the electronegative nitrogen and oxygen atoms and the partially positive hydrogen atoms b. the shape resulting from the union of more than one polypeptide chain c. the structure resulting from the bonding interactions between the side groups of the amino acids d. the sequence of amino acids linked together with peptide bonds 16. What is the difference between pyrimidine bases and purine bases? a. There are three types of pyrimidine bases (uracil, thymine, and cytosine) and two types of purine bases (adenine and guanine). b. They are the two types of nitrogenous bases that make up nucleotides. c. Pyrimidine bases are single organic rings while purine bases are two-ringed organic structure. d. All of the above.
Transcribed Image Text:13. The amino acids lysine and tryptophan are not found in many plants. Why is this of concern to vegetarians who consume no meat in their diet? a. Lysine and tryptophan are essential amino acids. b. The human body cannot synthesize these amino acids, and must get them from the diet. c. Since proteins are made from combinations of 20 different amino acids, people need all 20 amino acids. d. All of the above. 14. What level of protein structure is associated with the order in which amino acids are linked together in a protein? c. tertiary structure d. quaternary structure a. primary structure b. secondary structure 15. Which of the following describes the quaternary structure of a protein? a. the structure resulting from hydrogen bonding between the electronegative nitrogen and oxygen atoms and the partially positive hydrogen atoms b. the shape resulting from the union of more than one polypeptide chain c. the structure resulting from the bonding interactions between the side groups of the amino acids d. the sequence of amino acids linked together with peptide bonds 16. What is the difference between pyrimidine bases and purine bases? a. There are three types of pyrimidine bases (uracil, thymine, and cytosine) and two types of purine bases (adenine and guanine). b. They are the two types of nitrogenous bases that make up nucleotides. c. Pyrimidine bases are single organic rings while purine bases are two-ringed organic structure. d. All of the above.
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There are 20 amino acids which are the building block of proteins. All the 20 amino acids can be classified into different groups based on the presence of the side chain which impart special properties to amino acids such as hydrophilic, hydrophobic, polar, nonpolar, basic, acidic, aromatic, aliphatic, positively charged, negatively charged.  

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