Test bank for Molecular Cell Biology 9th edition by Harvey Lodish

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Test bank for Molecular Cell Biology 9th edition by Harvey Lodish Test Bank Section 2.1 1. Covalent bonds between which of the following pairs of atoms are nonpolar? a. C–C b. C–H c. O–H d. a and b Ans: d Question Type: Multiple Choice Chapter: 2.1 Blooms: Remembering Difficulty: Easy 2. Which of the following is a noncovalent interaction? a. hydrophobic effect b. ionic interactions c. van der Waals interactions d. all of the above Ans: d Question Type: Multiple Choice Chapter: 2 Blooms: Remembering Difficulty: Easy 3. Which of the following is the strongest interaction? a. hydrogen bond b. ionic bond c. phosphoanhydride bond d. van der Waals interaction Ans: c Question Type: Multiple Choice Chapter: 2 Blooms: Understanding Difficulty: Easy 4. Which of the following is the weakest interaction? a. hydrogen bond b. ionic bond c. phosphoanhydride bond d. van der Waals interaction Ans: d Question Type: Multiple Choice Chapter: 2 Blooms: Understanding Difficulty: Easy 5. When two atoms differing in electronegativity are joined in a covalent bond, then the: a. electrons are shared equally between the atoms. b. bond is nonpolar. c. resulting compound is devoid of any dipole moment. d. atom with the greater electronegativity attracts the bonded electrons more strongly. Ans: d Question Type: Multiple Choice Chapter: 2 Blooms: Understanding Difficulty: Moderate 6. The interactions between two proteins such as an antibody and an antigen or a hormone and its receptor are quite strong despite the fact that these interactions consist of relatively weak noncovalent bonds. How can this be? Ans: Two proteins can bind tightly because of molecular complementarity, in which multiple noncovalent bonds participate. Although each individual bond is weak, the cumulative effect of many noncovalent bonds is a relatively strong and highly specific interaction. Question Type: Essay Chapter: 2 Blooms: Analyzing Difficulty: Moderate 7. What produces the dipole of a water molecule? Ans: The dipole of a water molecule is caused by the difference in electronegativity between O and H. The oxygen atom has a greater electronegativity than the hydrogen atom. As a result, oxygen attracts the electrons in the O–H bond more strongly, and the oxygen side of the bond has a slight net negative charge. This results in a dipole moment. Question Type: Essay Chapter: 2.1 Blooms: Understanding Difficulty: Moderate Section 2.2 8. Which of the following is a negatively charged amino acid? a. alanine b. aspartate c. glutamine d. histidine Ans: b Question Type: Multiple Choice Chapter: 2 Blooms: Remembering Difficulty: Easy 9. Which of the following is/are a hydrophilic amino acid? a. aspartate b. serine c. tryptophan d. aspartate and serine Ans: d Question Type: Multiple Choice Chapter: 2 Blooms: Remembering Difficulty: Easy 10. Adenosine is a: a. component of RNA. b. nucleoside. c. pyrimidine.

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