1. Which of macromolecule is composed of chains of amino acids that are joined together type by peptide bonds? A. lipids В. fats C. carbohydrates D. proteins

Describe the unique features of the following molecules, why are the critical to life? a.  Carbohydrates b. Lipids. c. Proteins. d. Nucleic Acids.

6. Why is Low Density Lipoprotein (LDL) considered “bad” cholesterol? A. Deliver fats made in liver to cells B. Remove cholesterol from the body and deliver to liver C.Carry digested fat through lymph to bloodstream D. Deposit cholesterol in walls of arteries   7. Which one of the following is/are a function (s) of cholesterol? A. Part of the cell plasma membrane B. Precursor for vitamin D synthesis C. Precursor for sex hormones D. All of the above   8. Which one of the following is /are types of lipids found in food and in your body? A. Sterols B. Phospholipids C. Triglycerides D. All of the above   9. True / False: Atherosclerosis is the ONLY risk factor associated with heart disease A. True B. False   10. Which one of the following carry digested fat through lymph into blood stream? A. Low density lipoprotein (LDL) B. High density lipoprotein (HDL) C. Chylomicrons D. Very Low Density lipoprotein (VLDL

3. Use the chemical structures shown on the next page to answer the following questions. Some questions may have more than 1 correct answer, so put down all correct answers. Some structures may be used to answer more than 1 question and some may not be used at all. a. Which molecules are amino acids? b. Which molecules are carbohydrates? c. Which molecule is a hydrophobic amino acid? d. Which molecules are lipids? e. Which molecule(s) possess at least one glycosidic linkage? f. Which molecule(s) possess at least one ester linkage? g. Which molecule(s) is a nucleic acid? h. Which molecule(s) is a nucleotide? i. Which molecules are polypeptides? j. Which molecules are steroids?

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