Biochemistry Test Multiple Choice exam with correct answers 2024.

The most common elements in most living things are: A. Oxygen, carbon, hydrogen, calcium B. Oxygen, carbon, hydrogen, nitrogen C. Oxygen, carbon dioxide, hydrogen, nitrogen D. Oxygen, carbon, sodium, nitrogen - answer-B. Oxygen, carbon, hydrogen, nitrogen Which of the following makes up a molecule of water? A. one atom of hydrogen and one atom of oxygen B. one atom of sodium and one atom of chlorine C. one atom of hydrogen and two atoms of oxygen D. two atoms of hydrogen and one atom of oxygen - answer-D. two atoms of hydrogen and one atom of oxygen Which statement is true? A. simple sugars are made of polysaccharides B. glycerol is made of fatty acids C. polymers are made of monomers D. amino acids are made of proteins - answer-C. polymers are made of monomers Unlike most other macromolecules, lipids are: A. polar B. water soluble C. hydrophilic D. hydrophobic - answer-D. hydrophobic The water strider is an insect that skims across the surface of a pond without falling in thanks to water's high surface tension. Water has a high surface tension as a result of which of the following? A. cohesion B. ionic bonding C. neutral pH D. heat capacity - answer-A. cohesion Amino Acid is to protein as A. fat is to lipid B. DNA is to RNA C. sugar is to fat D. nucleotide is to nucleic acid - answer-D. nucleotide is to nucleic acid Oxygen has an atomic number of 8. How many electrons would you find in a neutral oxygen atom? (wrong) - answer-8 Which of the following pentose sugars would you find in a DNA monomer? A. deoxyribose B. fructose C. ribose D. amylose - answer-A. deoxyribose An enzyme: A. speeds up the rate of chemical reactions B. serves as an organic catalyst C. attaches to a specific substrates D. all of the above - answer-D. all of the above With the exception of carbon dioxide, most carbon-based molecules are classified as: A. inorganic B. hydrophilic C. unsaturated D. organic - answer-D. organic The reaction that adds a monomer to a chain is called a: A. monomer reaction B. dehydration synthesis reaction C. hydrolysis reaction D. polymer reaction - answer-B. dehydration synthesis reaction Sucrose is a carbohydrate made up of two sugar monomers, a glucose and a fructose, which means that sucrose is a: A. monosaccharide B. disaccharide C. polysaccharide D. steroid - answer-B. disaccharide Ms. Bleakney and Ms. Figueredo took the Class of 2019 on a field trip to Alaska to go ice fishing. The biology students were fascinated by the diversity or organisms thriving under the ice, especially the salmon. Which of the following properties of water allows the salmon to survive the long cold Alaskan winter? A. water has high surface tension B. water exhibits capillary action C. water is nearly universal solvent D. water is less dense as a solid - answer-D. water is less dense as a solid Polysaccharides include A. starch, glycogen, and carbohydrates B. glucose, glycogen, and cellulose C. starch, glucose, and cellulose D. starch, glycogen, and cellulose - answer-D. starch, glycogen, and cellulose Cholesterol and estrogen are both A. carbohydrates B. saturated fats C. steroids D. phospholipids - answer-C. steroids Water molecules demonstrate special properties such as surface tension, temperature moderation, and capillary action because they: (wrong) A. form hydrogen bonds B. contains polar covalent bonds C. contain ionic bonds D. Both A and C E. Both A and B - answer-E. Both A and B The part of the amino acid that makes it different from each of the other amino acids is called the _____. - answer-Side group One function of lipids is to_____. - answer-store energy