Biochemistry MCQ Quiz: Exam!

15 Questions | By Pharmacgy | Last updated: Mar 21, 2022 | Total Attempts: 1790

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1.

In a water molecule, hydrogens are partially _____; oxygens are partially _____.
- A.
  
  Negative; negative
- B.
  
  Negative; positive
- C.
  
  positive; negative
- D.
  
  Positive; positive
2.

Hydrogen bonds are approximately _____% of the bond strength of covalent C-C or C-H bonds.
- A.
  
  1
- B.
  
  5
- C.
  
  20
- D.
  
  50
3.

Hydrogen bonds within liquid water are _________.
- A.
  
  attractions between the protons of the oxygen nuclei
- B.
  
  Ion-induced dipole interactions
- C.
  
  Attractions between the H⁺ and ^–OH ions of the liquid
- D.
  
  Dipole-dipole interactions
4.

A molecule that has both a polar and nonpolar region is called _____________.
- A.
  
  Micelleic
- B.
  
  Amphiphilic
- C.
  
  Endergonic
- D.
  
  Membrane
5.

In aqueous solution, globules of up to several thousand amphiphilic molecules arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center are called _____.
- A.
  
  Micelles
- B.
  
  Vacuoles
- C.
  
  Liposomes
- D.
  
  Bilayers
6.

In an aqueous solution, if the [OH^–] is 3.0´10^-5 M, what is the [H⁺]?
- A.
  
  7.0´10^-9
- B.
  
  7.0´10^-2
- C.
  
  3.3´10^-10
- D.
  
  3.3´10^-3
7.

What would be the resulting pH if one drop (0.05 ml) of 1.0 M HCl was added to one liter of pure water (assume pH 7.0)?
- A.
  
  2.7
- B.
  
  4.3
- C.
  
  5.0
- D.
  
  0 (there would be no significant change)
8.

Which of the following could be used to formulate 100 mls of a 0.10 M phosphate buffer (pK=6.82) at pH 7.2?
- A.
  
  2.9 mmoles of Na₂HPO₄ and 7.1 mmoles of NaHPO₄
- B.
  
  10 mmoles of Na₂HPO₄ and 7.1 mmoles of NaOH
- C.
  
  10 mmoles of NaHPO₄ and 7.1 mmoles of HCl
- D.
  
  All of the above
9.

What is the resulting pH if 10 millimoles of HCl is added to 1 liter of a 0.1 M phosphate buffer at pH 7.00 (pK=6.82)?
- A.
  
  6.82
- B.
  
  6.98
- C.
  
  7.01
- D.
  
  7.19
10.

At any given moment, a single water molecule participates in _____ strong hydrogen bond(s). The role played by the water molecule is best characterized as _____.
- A.
  
  two ; one H-bond donor, one H-bond acceptor
- B.
  
  Two ; two H-bond donor
- C.
  
  Two ; two H-bond acceptor
- D.
  
  One; H-bond donor
11.

In a hydrogen bond between a water molecule and another biomolecule, _____
- A.
  
  A hydrogen ion on the water molecule forms an ionic bond with a hydride ion on the other molecule
- B.
  
  the hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom
- C.
  
  The partial charge on a hydrogen of the water interacts with the partial charge on a hydrogen of the other molecule
- D.
  
  A hydrogen on the water molecule forms a covalent bond to an oxygen or nitrogen atom on the other molecule
12.

The strongest non-covalent interactions are _____
- A.
  
  Van der Waals interactions
- B.
  
  London dispersion forces
- C.
  
  Hydrogen bonds
- D.
  
  Ionic interactions
13.

Due to the formation of hydrogen bonds, _____ is highly soluble in water.
- A.
  
  carbon dioxide
- B.
  
  Sodium chloride
- C.
  
  Methanol
- D.
  
  Octane
14.

Which of the following functional groups has two hydrogen bond donors and one hydrogen bond acceptor?
- A.
  
  alcohol
- B.
  
  Ester
- C.
  
  Thiol
- D.
  
  Amine
15.

What term is used to describe the exclusion of nonpolar substances from an aqueous solution?
- A.
  
  Nonpolar effect
- B.
  
  Lipid effect
- C.
  
  hydrophobic effect
- D.
  
  Oil droplet effect