Bio 264 Lesson 2 Practice Questions With Correct Answers

Bio 264 Lesson 2 Practice Questions With Correct Answers Covalent bonds form when - CORRECT ANSWER electrons are shared between two atoms. Reactions that use water to split molecules apart are called _______ reactions. - CORRECT ANSWER hydrolysis Water molecules are held to each other by ________. - CORRECT ANSWER hydrogen bonds The presence of water in our bodies allows us to _______. - CORRECT ANSWER cool the body with sweat. maintain a fairly constant body temperature. provide an environment for chemical reactions. keep tissues moist and reduce friction. all of the above Nucleotides __________. - CORRECT ANSWER are the repeating units of nucleic acids. Which of the following is a component of a nucleotide? - CORRECT ANSWER Adenine--a nitrogen base Which of the following chemical reactions best represents the synthesis of ATP? - CORRECT ANSWER DP + Pi + energy → ATP + H2O Which of the following chemical reactions best represents the decomposition of ATP? - CORRECT ANSWER ATP + H2O → ADP + Pi + energy f starch were digested into its monomers, you would have only ________. - CORRECT ANSWER monosaccharides. An atom has an atomic number of 19 and a mass number of 39. This atom will have ________. - CORRECT ANSWER 20 neutrons the nucleus of an atom is composed of _ - CORRECT ANSWER protons and neutrons Nucleotides __________. - CORRECT ANSWER are the repeating units of nucleic acids. DNA __________. - CORRECT ANSWER contains the sugar deoxyribose. Which of the following organic groups does an enzyme belong to? - CORRECT ANSWER Protein Fish sperm consists mostly of the male fish's DNA. If we tested a sample chemically, we should find relatively high amounts of _________. - CORRECT ANSWER nitrogenous bases, sugar, and phosphate groups. In water, hydrogen bonding occurs between the hydrogen atom in one molecule and __________. - CORRECT ANSWER an oxygen atom in a different molecule. Atoms are held together by chemical bonds to form _________. - CORRECT ANSWER molecules Which of the following organs can store glycogen? - CORRECT ANSWER Liver and muscles Table salt (NaCl) is - CORRECT ANSWER a compound Water - CORRECT ANSWER is composed of polar molecules into which ionic substances dissociate. If blood pH falls below the normal range ________. - CORRECT ANSWER an imbalance called acidosis results. Polysaccharides __________. - CORRECT ANSWER contain long chains of monosaccharides. Which of the following statements best describes RNA? - CORRECT ANSWER RNA is a single-stranded molecule Which of the following would be most easily broken? - CORRECT ANSWER A hydrogen bond A coenzyme is _________. - CORRECT ANSWER a nonprotein organic cofactor that interacts with an enzyme to allow it to work. Which of the following statements is true? The primary role of carbohydrates is to serve as an energy source. Carbohydrates include sugars, starches, and amino acids. Maltose is a complex carbohydrate. Sucrose is the primary source of energy for most cells. Most carbohydrates come from animal products. - CORRECT ANSWER A A _____________ fatty acid has one double covalent bond between carbon atoms. - CORRECT ANSWER monosaturated If orange juice has a pH of 4 then _________. the H+ concentration is 4 H+ ions. it is an acidic solution. it is an alkaline solution. it is an acidic solution with a H+ concentration of 4% - CORRECT ANSWER B an acidic solution Considering solutions with the following pH, which is alkaline? 8, 7, 6, 5, 4 - CORRECT ANSWER 8 Which of the following is a synthesis reaction? Two amino acids are bonded together to form a dipeptide Sucrose is chemically separated to form one molecule of glucose and one molecule of fructose Sodium chloride is dissolved in water Several dipeptide chains are formed from digestion of a long polypeptide chain ATP is converted to ADP - CORRECT ANSWER A Fatty acid A has 10 double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain. Fatty acid A is saturated. Fatty acid B is unsaturated. Both fatty acids are saturated. Both fatty acids are unsaturated. Fatty acid B is saturated. - CORRECT ANSWER FAtty acid B is saturated What is the main difference between a fat (triglyceride) and a phospholipid? - CORRECT ANSWER A phospholipid has 2 fatty acids attached to glycerol, whereas a fat has 3 An amino acid is to a protein as a ________ is to a nucleic acid. - CORRECT ANSWER nucleotide _________ bonds are formed when atoms share electrons unequally - CORRECT ANSWER Polar All enzymes are ______ but not all of those are enzymes. - CORRECT ANSWER protiens If sodium is a cation and has an atomic number of 11 and an atomic mass of 23, then which of the following will be MOST true? - CORRECT ANSWER 11 protons, 12 neutrons and 12 electrons In water, MgCl2 dissociates into Mg2+ and Cl-. Based on this information, what type of bond is involved in the formation of MgCl2? - CORRECT ANSWER ionic Which of the following is a carbohydrate? Triglyceride Hemoglobin Cholesterol Animal fat Lactose - CORRECT ANSWER Lactose What protein structure results from folding or coiling of a polypeptide chain caused by hydrogen bonds between amino acids? Quaternary structure Tertiary structure Secondary structure Primary structure Peptide structure - CORRECT ANSWER Secondary