15. Which molecules are the major components of proteins? carbon, hydrogen, oxygen, nitrogen, and sulfur oxygen, nitrogen, sulfur, and hydrogen carbon, hydrogen, and oxygen carbon, nitrogen, and hydrogen a. b. C. d.

3) Biological molecules and their chemical properties affect cellular processes and biochemical reactions. Your]cousin mentions that your uncle is on a low cholesterol diet. "He is trying to eradicate all cholesterol from his body," says your cousin. Focusing your argument on cell membranes, explain why the body cannot function without cholesterol. llular comnonents

1. Explain how structural changes in important proteins lead to pathological conditions.

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21. Which macromolecules always contain carbon, hydrogen, oxygen, nitrogen, and sulfur? A. nucleic acids (like DNA) B. carbohydrates (like starch) C. lipids (like olive oil) D. proteins (like collagen) E. all of the above

1. What is the purpose of protein synthesis?" 2. Compare the base pair of DNA to the base pair of RNA?

18. Which of the following entities has the largest interaction cross-section (most likely to interact) when bulk biological tissue is irradiated with ionizing radiation? A. Lipid B. Nucleic acid C. Protein D. Sucrose

5. Dietary fibers are refers to which kind of macromolecules? 6. Why protein is known as a molecular instrument through which gene is expressed? 7. Why in our body the enzymes work in a narrow range of pH?

1.Globular proteins fold up in compact, spherical structures that have uneven surfaces. They tend to form multi-subunit complexes, which also have a rounded shape. Fibrous proteins, on the other hand, span relative large distances within the cell and in the extracellular space. Which of the proteins below are fibrous proteins? a. collagen, keratin b. tubulin and actin monomers c. elastase, pepsin d. hemoglobin and myoglobin   2. Which of the following statements is correct regarding oxidoreductase enzymes? a. NADH + H+/NAD+ are involved in catabolism and NADPH + H+/NADP+ participate in anabolism.    b. The oxidation of the reduced member of a redox pair is associated to a ΔΔG < 0. c. The reduction of the oxidized member of a redox pair is associated to a ΔΔG > 0 d. All of the above e. None of the above   3.Which of the following statements is incorrect?     a. We only need to consume vitamins in small amounts b. Vitamins are precursors to…

10. Which of the following are steps in the biosynthesis of proteins can be regulated? A.macromolecular level  B.cellular/ organelle levels  C.tissue/ organ level  D. organismal level  E. all of the above  F. none of the above.