portage learning, CHEM 120, Exams 1-8 & Final Exams, latest Answers 2022

Chem 12o, portage learning, exams 1-8 and the Final exam.True or False: According to the Module, a compound with a molecular mass of 1,000 g/mol is considered a macromolecule. True Correct Question 17 3 / 3 pts For an organic compound, which structure is the most efficient to draw? Correct! Line bond 2.5 / 5 pts (Short Response) What is the hydrophobic effect and how does a clathrate help explain this phenomenon? Your Answer: Te hydrophobic effect is nonpolar substances to aggregate in an aqueous solution and exclude water molecules. Water prefers to interact with itself. Water pushes things together and forms a plasma membrance. Clathrate forms a tight structure. The hydrophobic effect helps scientists explain how biological molecules form and interact. For instance, when molecules with both a nonpolar and polar regions dissolve in water, the nonpolar regions pack together. The packing of the nonpolar regions minimizes the interaction with water and the polar region interact with water, which in total is called the hydrophobic effect. The driving force behind this effect is the spontaneous drive of water to bind to itself through hydrogen bonds. To maximize the hydrogen bonds, water orders itself around the hydrophobic portion of the nonpolar regions in a cage structure also called a clathrate. In so doing, water can form bonds with itself and also permit the nonpolar regions to be dissolved. Question 28 5 / 5 pts (Short answer) In one sentence, identify the most noticeable difference between the A-form of DNA and the Z form of DNA. Your Answer: The Z-form of DNA is left handed while the A-form of DNA is right handed. A-form is a right-handed helix while the Z-form of DNA is a left-handed helix. Which types of molecules are most likely to be present in membranes? Your Answer: Triacylglycerols- cylinder shaped, store energy and provide insulaton by trapping heat. Phospoglycerides- choline in head group. Glycerol as a backbone. Sphingolipids- contains amide group. Isoprenoid compounds- Fat soluble vitamins.Starting material for many lipid molecules. Vitmans A and K. Phosphoglycerides, sphingolipids, cholesterol, and proteins are all found in the membrane. These molecules are all loosely associated with each other as described by the fluid mosaic model of the cellular membrane. They form a membrane bilayer