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Test Bank for Molecular Cell Biology 8th Edition by Harvey Lodish, Arnold Berk, Chris A. Kaiser, Monty Krieger, Anthony Bretscher, Hidde Ploegh, Angelika Amon, Kelsey C. Martin €18,14
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Test Bank for Molecular Cell Biology 8th Edition by Harvey Lodish, Arnold Berk, Chris A. Kaiser, Monty Krieger, Anthony Bretscher, Hidde Ploegh, Angelika Amon, Kelsey C. Martin
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Test Bank for Molecular Cell Biology 8th Edition by Harvey Lodish, Arnold Berk, Chris A. Kaiser, Monty Krieger, Anthony Bretscher, Hidde Ploegh, Angelika Amon, Kelsey C. Martin

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  • 3 mei 2024
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  • test bank for molecular cell biology 8th edition b

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Voorbeeld van de inhoud

, Test Bank for All Chapters (Chapter 2-24) 2-1


Chemical Foundations


2
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

,15 Transport Across Cell Membranes 2

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

, 15 Transport Across Cell Membranes 3


Ans: d
Question Type: Multiple Choice
Chapter: 2
Blooms: Remembering
Difficulty: Easy

10. Adenosine is a:
a. component of RNA.
b. nucleoside.
c. pyrimidine.
d. a and b

Ans: d
Question Type: Multiple Choice
Chapter: 2
Blooms: Remembering
Difficulty: Moderate

11. Which of the following is a monosaccharide?
a. fructose
b. galactose
c. glucose
d. all of the above

Ans: d
Question Type: Multiple Choice
Chapter: 2
Blooms: Remembering
Difficulty: Easy

12. Based on what you know about hydrophobic interactions, which of the following is/are composed of a bilayer?
a. a cell’s membrane
b. spontaneously aggregated phospholipids surrounding an aqueous interior
c. lipid vesicles that have budded off the cell’s membrane
d. all of the above

Ans: d
Question Type: Multiple Choice
Chapter: 2
Blooms: Remembering
Difficulty: Easy

13. You discover that you suffer from a deficiency in the amino acid tryptophan. At the pharmacy, you find both D-
tryptophan and L-tryptophan supplements. Which do you purchase? Why?

Ans: You should choose L-tryptophan. All amino acids can exist as one of two stereoisomers ( D or L) because of asymmetry
around the α carbon. Proteins consist of the L form of amino acids, and as these stereoisomers possess distinct biological
properties and are not readily interconverted, you should choose the form that is normally utilized by cells.
Question Type: Essay
Chapter: 2
Application
Difficulty: Moderate

14. Cysteine often plays an important role in stabilizing protein structure. Explain how this works.

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