Bio 400 EXAM WITH 100% CORRECT ANSWERS A+ PASS

Bio 400 EXAM WITH 100% CORRECT ANSWERS A+ PASS Which is the best descrpition of a carbonyl group? - Answer- A carbon atom jointed to an oxygen by a double covalent bond. Which of the following contains nitrogen in aidditon to carbon, oxygen, and hydrogen? - Answer- An amino acid such as glycine. Which two functional groups are always found in amino acids? - Answer- Carboxyl and amino. Amino acids are amino acids because they always posses which functional group? - Answer- Carboxyl. A carbon skeleton is covalently bonded to both an amino group and a carboxyl group. When placed in water it - Answer- would function as both an acid or a base. Which functional group can act as acids? - Answer- Carboxyl and Phosphate. Testosterone and estradiol are - Answer- Steroids Which of the following statements correctly describes geometric isomers? - Answer- They have variations in arrangement around double bond. A mixture of two enatiomers, that is, molecules that - Answer- are mirror images of one another. A compound contains hydroxyl groups as its predominant functional group. Which of the following statements is true concerning this compund? - Answer- It should dissolve in water. Testosterone and estradiol are male and female sex hormones, respectively, in my vertebrases. How do these molecules differ? - Answer- Testosterone and estradiol have different functional groups attached to the same carbon skeleton. Which of the following is not a polymer? - Answer- Gluclose What is the chemical mechanism by which cells make polymers from monomers? - Answer- Dehydration reactions How many molecules of water are needed to completely hyrdolyze a polymer that is 11 monomers long? - Answer- 10 Which of the following best summarizes the relationship between dehydration reactions and hydroloysis? - Answer- Dehydration reactions assemble polymers, and hydrolsis reactions break down polymers. AND Macromoleculer synthesis occrus through the removal of water and digestion occurs through the addition of water. Which of the following polymers contain nitrogen? - Answer- Chitin The enzyme amylase can break glycosidic linkages between glucose monomers only fi the monomers are the alpha form. Which of the following could amylase break down? - Answer- Glycogen How is lactose classified? - Answer- as a disacharide All of the following are polysaccharides except - Answer- Glycogen Which of the following is true of both starch and cellulose? - Answer- They are both polymers of gluclose. Which of the following is true of cellulose? - Answer- It is a major structural component of plant cell walls. Humans can digest starch but not cellulose because - Answer- Humans have enzymes that can hydrolize the alpha glycosidic linkages of starch but the the beta glycosidic linkages of cellulose Which is a false statement regarding saturated fats? - Answer- They have multiple bonds in the carbon chains of their fatty acids. Which of the following statements is false for the class of biological molecules known as lipids? - Answer- They are soluble in water. Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits. Which of the following is an exception to this statement? - Answer- a steroid. The hydrogenation of vegetable oil results in which of the following? - Answer- saturated fats and unsaturated fats with trans double bondsan increased contribution to artherosclerosis the oil (fat) being a solid at room temperature Why are human sex hormones considered to be lipids? - Answer- They are steroids, which are not soluble in water. All of the following contain amino acids except - Answer- cholesterol