40 MCQs with Answers - Introductory Biology I - Exam I | BIOL 111, Exams of Biology

Download 40 MCQs with Answers - Introductory Biology I - Exam I | BIOL 111 and more Exams Biology in PDF only on Docsity! Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The function of each protein is a consequence of its specific shape. What is the term used for a change in a protein's three-dimensional shape or conformation due to disruption of hydrogen bonds, disulfide bridges, or ionic bonds? | A) hydrolysis B) denaturation C) stabilization D) renaturation E) destabilization 2) A type of protein critical to all cells is organic catalysts called A) enzymes. B) metabolites. C) feedback activators. D) nutrients. E) feedback inhibitors. SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Please refer to Figure 2.1 to answer the following questions. A. Figure 2.1 3) Which drawing depicts the electron configuration of nitrogen (% N)? 3) a MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 4) What is a triacylglycerol? A) a lipid that makes up much of the plasma membrane B) a protein with tertiary structure C) a molecule formed from three alcohols by dehydration reactions D) a carbohydrate with three sugars joined together by glycosidic linkages a lipid made with three fatty acids and glycerol Iho 2) 4) The following question is based on Figure 3.1: solute molecule surrounded by a hydration shell of water. Figure 3.1 5) Based on your knowledge of the polarity of water molecules, the solute molecule is most likely A) without charge. B) negatively charged. C) nonpolar. D) hydrophobic. @)positively charged. r H H \ H \ lL H L/ 8 fe \ VAS Ho Sc=c% SH HO c=” *y f \ \ \ H H yk H H* | H Figure 4.3 6) The two molecules shown in Figure 4.3 are best described as A) radioactive isotopes. B) structural isomers. C) nonisotopic isomers. geometric isomers. ) enantiomers. 7) There are 20 different amino acids. What makes one amino acid different from another? A) different alpha (a) carbons B) different asymmetric carbons different side chains (R groups) attached to an alpha (a) carbon D) different carboxyl groups attached to an alpha (a) carbon E) different amino groups attached to an alpha (a) carbon 9) 6) 19) ‘Temperature usually increases when water condenses. Which behavior of water is most directly responsible for this phenomenon? A) the release of heat by the breaking of hydrogen bonds B) reactions with other atmospheric compounds C) the change in density when it condenses to form a liquid or solid D) the high surface tension of water €£) the release of heat by the formation of hydrogen bonds 20) Which of the following statements is true about buffer solutions? A) They maintain a constant pH when bases are added to them but not when acids are added to them. B) They are found only in living systems and biological fluids. C) They maintain a constant pH when acids are added to them but not when bases are added to them. D) They maintain a relatively constant pH when either acids or bases are added to them. E) They maintain a constant pH of exactly 7 in all living cells and biological fluids. 21) The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA ontains one less oxygen atom. B) is a six-carbon sugar and the sugar in RNA is a five-carbon sugar. - C) can form a double-stranded molecule. D) has a six-membered ring of carbon and nitrogen atoms. i) can attach to a phosphate. 22) What is the chemical mechanism by which cells make polymers from monomers? A) the formation of disulfide bridges between monomers B) hydrolysis C) ionic bonding of monomers D) phosphodiester linkages E) dehydration reactions 23) Pure, freshly-distilled water has a pH of 7. This means that A) the concentration of H* ions in the water equals the concentration of OH™- ions in the water. B) the concentration of H+ ions in the water is 7 times the concentration of OH ions in the water. C) there are no OH™ ions in the water. D) The concentration of OH™ ions in the water is 7 times the concentration of H* ions in the water. E) there are no Ht ions in the water. 19) 20) 21) 22) 23) 24) Shown here in Figure 4.2 are the structures of glucose and fructose. These two molecules are = nonisotopic isomers. structural isomers. _C) geometric isomers. D) geometric isotopes. EK) enantiomers. H—C—OH c=0 HO—C—H HO—C—H H—C—OH H—C—OH H—C—OH H—C—OH H---G---OH H—C—OH H H glucose fructose Figure 4,2 25) An example of a hydrogen bond is the bond between A) C and H in methane (CHa). B) Natand Cl- in salt. C) the two hydrogen atoms in a molecule of hydrogen gas (H). D) Mgtand Cl- in MgCl. _E) the H of one water molecule and the O of another water molecule. The following questions refer to the structures shown in Figure 4.5. A B. c H H H Hy | | | yN—-O—-H H-C—H =H—C—C=0-H H’. | | H H D. E "\cxo '\ eae!" /- f~ oN H. H O—H Figure 4.5 26) Which of the structures is an impossible covalently bonded molecule? A) A B) B Cgc D)D E)E 24) 25) 26) 27) Which type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids? —_27) A) mitochondrion B) lysosome -C) contractile vacuole ») ribosome (Ppa endoplasmic reticulum 28) Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage toone 28) galactose molecule. How is lactose classified? A) as a polysaccharide as a disaccharide as a hexose D) as a monosaccharide E) as a pentose 29) A covalent chemical bond is one in which | . 29) A) the inner-shell electrons of one atom are transferred to the outer shell of another atom. B) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. C) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms. D) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. | E) outer-shell electrons of one atom are transferred to the inner electron shells of another atom. 30) All of the following are part of a plokasyone cell except | | 30) Ajacell wall. - B) a plasma membrane. Oe endoplasmic reticulum. DD) DNA. E) ribosomes. 31) The mass number of an element can be easily approximated by adding together the number of 31) in an atom of that element. A) energy levels B) protons and electrons C) protons and neutrons D) isotopes E) neutrons and electrons 32) What is the difference between covalent bonds and ionic bonds? 32) CA) Covalent bonds involve the sharing of electrons between atoms, and ionic bonds involve the electrical attraction between atoms. B) Covalent bonds involve the sharing of protons between atoms, and ionic bonds involve the sharing of neutrons between atoms. C) Covalent bonds involve the transfer of electrons between atoms, and ionic bonds involve the sharing of neutrons between atoms. D) Covalent bonds involve the sharing of protons between atoms, and ionic — involve the sharing of electrons between atoms. - E) Covalent bonds involve the sharing of neutrons between atoms, and ionic bonds involve the sharing of electrons between atoms.