Test Bank for Cell and Molecular Biology Concepts and Experiments 8th Edition Karp | Complete A ll Chapters 2024/2025 | VERIFIED

Test Bank for Cell and Molecular Biology Concepts and Experiments 8th Edition Karp | Complete A ll Chapters 2024/2025 | VERIFIED. Which of the following groups is capable of only hydrophilic interactions? d. H H C C C H H H H e.. H a.. OH b. C C C C C H H SH H H H H H H H H CH C C H H H H H NH 2 c.. C CH3 CH2 OH 2 C C C H H H NH H H OH 2 e. C C C C C H H H H H H H H H H H a. d. OH C C C H H H H H SH C O CH c. 3 OH b. C O Page 2 a) A b) B c) C d) D e) E Answer: b Difficulty: Medium Learning Objective: LO 2.3 Describe the role of noncovalent bonds in the structure of molecules such as water. Section Reference: Section 2.3 Noncovalent Bonds 3) Which of the following tripeptides would be most likely to be soluble in an organic (hydrophobic) solvent like benzene? a) N - phenylalanine - alanine - glycine – C b) N - leucine - alanine - lysine - C c) N - proline - phenylalanine - leucine - C d) N - arginine - lysine - proline - C e) N - glutamate - aspartate - glycine – C Answer: c Difficulty: Hard Learning Objective: LO 2.5 Describe the general structure and functions of biological molecules. Section Reference: Section 2.5 The Nature of Biological Molecules 4) What kind of bond results from an unequal sharing of electrons? a) ionic bond b) polar covalent bond c) H bond d) nonpolar covalent bond Answer: b Difficulty: Easy Learning Objective: LO 2.1 Describe the role of electrons in the formation of covalent bonds. Section Reference: Section 2.1 Covalent Bonds 5) Under which circumstances would electrons be most likely to be shared equally? a) when they are equidistant from nuclei b) when they are equidistant from each other Page 3 c) when atoms of the same element are sharing them d) when the atoms sharing them are different Answer: c Difficulty: Easy Learning Objective: LO 2.1 Describe the role of electrons in the formation of covalent bonds. Section Reference: Section 2.1 Covalent Bonds 6) The most electronegative atoms typically present in biological molecules are ____ and ____. a) O, C b) O, P c) O, N d) C, N e) C, Na Answer: c Difficulty: Easy Learning Objective: LO 2.1 Describe the role of electrons in the formation of covalent bonds. Section Reference: Section 2.1 Covalent Bonds 7) The most stable atoms and thus those that are typically nonreactive are the atoms that have _______. a) equal numbers of electrons and protons b) equal numbers of electrons and neutrons c) full inner shells d) full outer shells e) all covalent bonds Answer: d Difficulty: Easy Learning Objective: LO 2.1 Describe the role of electrons in the formation of covalent bonds. Section Reference: Section 2.1 Covalent Bonds 8) Why are free ionic bonds of little importance and relatively unlikely to form in living organisms? 1)Cells are composed mostly of water, which interferes with ionic bonds between free ions. 2)Cells are largely hydrophobic. 3)They are crystals. a) 1 b) 2 Page 4 c) 3 d) 1 and 2 e) 2 and 3 Answer: a Difficulty: Easy Learning Objective: LO 2.3 Describe the role of noncovalent bonds in the structure of molecules such as water. Section Reference: Section 2.3 Noncovalent Bonds 9) In a living organism, where are ionic bonds most likely to be found? a) in the cytoplasm b) between DNA strands c) deep in a protein's core where water is excluded d) on the surface of a protein e) on the surface of a lipid Answer: c Difficulty: Medium Learning Objective: LO 2.3 Describe the role of noncovalent bonds in the structure of molecules such as water. Section Reference: Section 2.3 Noncovalent Bonds 10) Which interaction is most important in enhancing the solubility of macromolecules in water? a) hydrophobic interactions b) nonpolar covalent bonds c) H bonds d) van der Waals forces e) Both hydrophobic interactions and nonpolar covalent bonds Answer: c Difficulty: Medium Learning Objective: LO 2.3 Describe the role of noncovalent bonds in the structure of molecules such as water. Section Reference: Section 2.3 Noncovalent Bonds 11) Where are hydrophobic interactions most likely to occur? a) on the surface of a water-soluble protein b) the core of a water-soluble protein c) in contact with water molecules d) between two charged molecules Page 5 e) between two ions Answer: b Difficulty: Easy Learning Objective: LO 2.3 Describe the role of noncovalent bonds in the structure of molecules such as water. Section Reference: Section 2.3 Noncovalent Bonds 12) What kind of noncovalent interaction is typified by interactions between two molecules that are so close together that they can experience weak attractive forces bonding them together? a) H bonds b) ionic bonds c) hydrophobic interactions d) polar covalent bonds e) van der Waals forces Answer: e Difficulty: Medium Learning Objective: LO 2.3 Describe the role of noncovalent bonds in the structure of molecules such as water. Section Reference: Section 2.3 Noncovalent Bonds 13) A molecule that is capable of releasing or donating a hydrogen ion is termed a(n) _______. a) base b) hydrion c) acid d) anachronism e) pain Answer: c Difficulty: Easy Learning Objective: LO 2.4 Explain the characteristics of acids, bases, and buffers. Section Reference: Section 2.4 Acids, Bases, and Buffers