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bio 106
first exam
| Question | Answer |
|---|---|
| atomic number refers to | numbers of protons and neutrons in an atom |
| what is an examplw of naked protein? a. a hydrogen ion b. an acid c. a base d. a hydroxyl ion | A) hydrogen ion |
| nucleus of an atom has a. neutrons and protons. b. neutrons and electrons. c. protons and electrons. d. protons only. e. neutrons only | nuetrons and protons |
| Sucrose is composed of Select one: a. two molecules of fructose. b. two molecules of glucose. c. a molecule of fructose and a molecule of glucose. d. a molecule of fructose and a molecule of galactose. e. a monosaccharide and a disaccharide | c. molecule of fructose and glucose |
| Oxygen, with an atomic number of 8, has ____ electrons in the first energy level and ____ electrons in the second energy level. Select one: a. 1; 7 b. 2; 6 c. 3; 5 d. 4; 4 e. 5; 3 | B) 2;6 |
| Which of the following is NOT true of hydrogen bonds? Select one: a. They are quite weak. b. The hydrogen is slightly positive. c. They are common in macromolecules. d. They are difficult to form and break. e. They always involve hydrogen | a) they ae weak |
| Plants store their excess carbohydrates in the form of Select one: a. starch. b. glycogen. c. glucose. d. cellulose | a) starch |
| The most likely reason that glucose dissolves in water is that it is Select one: a. an ionic compound. b. a polysaccharide. c. a polar molecule d. a very unstable molecule. e. highly nonpolar. | c) polar molecule |
| Which is the smallest unit of an element that retains the properties of the element? Select one: a. atom b. compound c. ion d. molecule e. mixture | A) atom |
| The column of water extending in tubes from plant roots to leaves is maintained by Select one: a. cohesion among water molecules. b. ionic bonds. c. covalent bonds. d. hydrophobic interactions. e. hydrophilic interactions | a) cohension amoung water molecules |
| The atomic mass of an atom is determined by the combined masses of its Select one: a. neutrons and protons. b. neutrons and electrons. c. protons and electrons. d. protons, neutrons, and electrons. e. neutrons, nucleus, and electrons | a) nuetrns an protons |
| Cholesterol is Select one: a. synthesized in the large intestine. b. remodeled into vitamin A. c. used in the construction of cell membranes. d. a component of plant cell walls. e. all of these | c) used in construction of cell membrain |
| The dots in the figure represent a Select one: a. covalent bond. b. ionic bond. c. hydrogen bond. d. polar covalent bond. e. hydrophobic interaction | c) hydrogen bond ( dotted line ) |
| In ____ bonds, both atoms exert the same pull on shared electrons. Select one: a. nonpolar covalent b. polar covalent c. double covalent d. triple covalent e. coordinate covalent | a) nonpolar covalent |
| A single carbon atom may form as many as ____ covalent bonds with other atoms. Select one: a. 2 b. 3 c. 4 d. 5 e. 6 | c) 4 |
| Which of the following is TRUE of water? Select one: a. The oxygen end is slightly electropositive. b. Hydrogen bonds hold water molecules together. c. Water covers about one-half of the earth's surface. | b) hydrogen bons hold water togther |
| The solvent, cohesive, and temperature stabilization properties of water are due to its Select one: a. ability to promote hydrophilic interactions. b. ionic bonds. c. hydrogen bonds. d. ability to promote hydrophobic interactions. | c) hydrogen bonds |
| An atom that gains or loses electrons becomes Select one: a. more stable. b. an ion. c. a molecule. d. unable to form bonds. e. radioactive. | b) an ion |
| The figure below illustrates a Select one: a. FAD coenzyme. b. Steroid c. Fat d. ATP molecule. e. Nucleotide | e) nucleotide ( pool house dog house ) |
| Which of the following are lipids? Select one: a. sterols b. triglycerides c. oils d. waxes e. all of these | e) all of these |
| Which of these components of a tossed salad will pass through the human digestive tract with the least digestion? Select one: a. sugar (in the dressing) b. oil (lipid) c. starch (in the croutons) d. cellulose (lettuce leaves) | d) cellulose |
| Four of the five answers listed below are acidic (pH below 7). Select the exception. Select one: a. vinegar b. soft drink c. soap d. lemon juice e. beer | c) soap |
| A macromolecule is composed of smaller numerous repeating subunits called Select one: a. polymers. b. isomers. c. monomers. d. isotopes. e. dimers. | c) monomers |
| Which of the following is FALSE concerning the atom in the figure? Select one: a. The first energy level is full. b. It has 2 electrons. c. It is electrically neutral. d. It has an atomic number of 2. e. It is highly reactive | e) it is highly reactive |
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mdelaune1