l T-Mobile LTE 11:08 AM Back Sample Exam 1.pdf 15-An a-helix and a -sheet are ex
ID: 201330 • Letter: L
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l T-Mobile LTE 11:08 AM Back Sample Exam 1.pdf 15-An a-helix and a -sheet are examples of: A types of secondary structure. B. types of proteins C. protein function. D. covalent bonding. 16. An isotope is a variant of an atom that differs in its number of A. protons B. neutrons C. electrons D. nuclei 17. Proteins with quaternary structure contain: A. multiple R groups B. multiple polypeptide chains. C. hydrophilic and hydrophobic regions. D. binding sites for ligands 18. Phospholipids are composed of A three fatty acids linked to glycerol B. two fatty acids linked to glucose. C. oligosaccharides linked to a protein. D. two fatty acids linked to glycerol. 19. Monosaccharides, such as glucose and fructose, are hydrophilic because: A they are acidic. B. they are polar due to the presence of hydroxyl groups. C. they are found on the cell surface. D. they are linked together by the removal of water 20. In a protein's tertiary (3") structure, acidic and basic amino acids interact via: A covalent bonds. B. hydrogen bonds. C. ionic bonds. D. polar bonds. Courses Calendar To Do Notifications InboxExplanation / Answer
15. The answer is A). Alpha and beta sheets are types of secondary structures.
16. The asnwer is B). Isotopes have same number of protons and differs in the number of neutrons.
17. The answer is B). Proteins with quaternary structure contains multiple polypeptide chains.
18. The answer is D). In phospholipids, two fatty acid chains are linked with a glycerol head.
19. The answer is B). Glucose and fructose are hydrophilic because of presence of hydroxyl (OH) groups.
20. The answer is B). The basic and acidic amino acids interact via hydrogen bonds in tertiary protein structures.
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