Biochem Final Exam (A+ Verified Solutions)

Which amino acid is not chiral? a. Proline b. Glycine c. Tryptophan d. Histidine e. Isoleucine correct answers b. Glycine Do nucleic acids have a charge at the physiological pH? a. Nucleic acids are positively charged due to phosphate groups in a back bone b. Nucleic acids are not charged molecules c. Nucleic acids are negatively charged due to phosphate groups in a back bone d. Sugars in nucleic acids are positively charged, so nucleic acid molecules are negatively charged correct answers c. Nucleic acids are negatively charged due to phosphate groups in a back bone What is NOT true about prokaryotes? a. Prokaryotes contain mitochondria b. Prokaryotes have plasma membrane c. Prokaryotes have DNA d. Prokaryotes have cell wall e. Prokaryotes are usually less than 2 μm in size correct answers a. Prokaryotes contain mitochondria As a sample of DNA is heated, it is said to melt. What is occurring? a. The DNA is converted from a solid to a liquid state b. The large polymeric DNA is broken down into smaller pieces as the backbone is partially hydrolyzed c. The DNA becomes less soluble and precipitates out of solution d. As hydrogen bonds are broken, the two DNA strands separate from one another e. Glycosidic linkages are broken, causing separation of the bases from the backbone correct answers d. As hydrogen bonds are broken, the two DNA strands separate from one another Select a monosaccharide that is incorrectly paired with its class. a. ribose: hexose aldose b. fructose: hexose ketose c. dihydroxyketone: triose ketose d. glyceraldehyde: triose aldose correct answers a. ribose: hexose aldose Which two are non-reducing sugars? A B C D E F correct answers C, D Write in one-letter code the name of the peptide below. correct answers AYDG