Block diagrams representing the general structures of two types of lipids are drawn. Which terms describe each diagram correctly? Check all that apply for each part. Part 1 of 2 E

Dixie Bee wanted to make JELL-O shots for her next party, but felt guilty about encouraging her guests to consume alcohol. She tried to compensate for the toxicity of the alcohol by adding pieces of healthy fresh pineapple to the shots, but when she did, the JELL-O never solidified. What happened? Hint: JELL-O is mainly sugar and a gelatinous mixture of proteins.

Figure 2.17 Fatty acids. Double bonds in the tails are highlighted in red. A. The tail of stearic acid is fully saturated with hydrogen atoms. B. Linoleic acid, with two double bonds, is unsaturated. The first double bond occurs at the sixth carbon from the end of the tail, so linoleic acid is called an omega-6 fatty acid. Omega-6 and C. omega-3 fatty acids are essential fatty acids, which means your body does not make them and they must come from food. D. The hydrogen atoms around the double bond in oleic acid are on the same side of the tail. Most other naturally occurring unsaturated fatty acids have these cis bonds. E. Hydrogenation creates abundant trans bonds, with hydrogen atoms on opposite sides of the tail. Figure It Out: Are the double bonds in linolenic acid cis or trans?

Watch this video (http://openstaxcollege.org/l/disaccharide) to observe the formation of a disaccharide. What happens when water encounters a glycosidic bond?

_________ is a monosaccharide. a. Glucose b. Sucrose c. Ribose d. Starch e. a and c f. a, b, and c

Unlike saturated fats, the fatty acid tails of unsaturated fats incorporate one or more ________. a. phosphate group c. double bonds b. glycerols d. single bonds

In a lipid bilayer, the of all the lipid molecules are sandwiched between all of the __________. a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails

Discuss Concepts Identify the following structures as a carbohydrate, fatty acid, amino acid, or polypeptide: a. (The R indicates an organic group.) b. C6H12O6 c. (glycine)20 d. CH3(CH2)16COOH

How can you distinguish a pentose sugar from a hexose sugar? a disaccharide from a sterol? an amino acid from a monosaccharide? a phospholipid from a triacylglycerol? a protein from a polysaccharide? a nucleic acid from a protein?

Fatty acids in phospholipids and triacylglycerols interact with one another by (a) disulfide bridges (b) van der Waals interactions (c) covalent bonds (d) hydrogen bonds (e) fatty acids do not interact with one another