WGU C190 Intro To Biology Test Questions & Answers (100% Correct)

Fats and oils are composed of - ANSWER - Fatty acids and glycerol Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has - ANSWER - . All single covalent bonds Triglycerides, a type of fat, are composed of what two subunits? - ANSWER - Fatty acids and glycerol What would you have to do to make a fat from the fatty acid shown above? - ANSWER - Attach it to a glycerol along with two other fatty acids. If one or more of the fatty acids in a triglyceride include omega-3 fatty acids, what can you predict about this substance at room temperature? - ANSWER - It is a liquid oil What kinds of molecules are the major fuel for the salmon's long trip? - ANSWER - Triglycerides (fats / oils) Based on your knowledge of the structure of triglycerides, what products would you expect to result from the complete hydrolysis of a fat molecule? More than one is correct. - ANSWER - Fatty acids and glycerol The blubber layer helps insulate mammals and birds that live in cold water; fat does not conduct heat very quickly. Applying what you know about lipids, what is the main advantage of covering feathers or fur in oil? - ANSWER - Oil sheds water and keeps underlying layers of fur or downy feathers dry. Another type of lipid that composes cells are called phospholipids. Phospholipids differ from other lipids because they - ANSWER - Contains a hydrophobic and hydrophilic end Highly simplified diagram of a membrane's structure is made up of - ANSWER - Phospholipids Which part of the molecules is hydrophilic? - ANSWER - The heads Ions of salt (sodium, NA+, and chloride, Cl−) are highly hydrophilic. Will they easily pass through the layer to enter or leave a cell? - ANSWER - No. What are molecules? - ANSWER - Molecules are made of atoms