Practice Exam 1

1.______provide cytoplasmic connections between animal cells while the

cytoplasm of plant cells is connected via .

  1. Tight junctions, plasmodesmata
  2. Plasmodesmata, tight junctions
  3. Gap junctions, plasmodesmata
  4. None of the above

2.Monosaccharides are linked together by to form polysaccharides.

a. Dehydration bonds

b. Hydrolytic bonds

c. Glycosidic bonds

d. Peptide bonds

3.Carboxyl groups are meaning they the [H+] of a solution.

a. acidic, increase

b. acidic, decrease

c. basic, increase

d. basic, decrease

4.A plasma membrane has a high percentage of saturated fatty acids. It is expected that this membrane will be more viscous (solid) than a membrane composed of unsaturated fatty acids.

a. True

b. False

5.How are DNA and RNA different?

  1. DNA has deoxyribose as its sugar, RNA has ribose as its sugar
  2. DNA has a hexose (6 carbon) sugar, RNA has a pentose (5 carbon) sugar
  3. A & B
  4. None of the above
  1. Which is NOT true about DNA structure?
  2. It is arranged in an anti-parallel helix
  3. A phosphate group is found at the 5’ end
  4. Pyrimidines hydrogen bond to Purines
  5. Adenine hydrogen bonds with Uracil
  6. Cytosine hydrogen bonds with Guanine
  1. Pick the complementary strand to this piece of DNA: 5’ A A G C C T A C 3’
  2. 5’ C C T A A G C A 3’
  3. 5’ T T C G G A T G 3’
  4. 3’ C C T A A G C A 5’
  5. 3’ T T C G G A T G 5’
  6. None of the above are complementary
  1. Which of the following is an example of Passive Transport?
  2. Diffusion down an ion’s electrochemical gradient
  3. Osmosis
  4. Facilitated diffusion
  5. All of the Above
  6. A & B only
  1. In a hypotonic solution, an animal cell will
  2. maintain normal cellular function
  3. lyse (burst)
  4. shrivel
  5. plasmolyze
  1. The diffusion of an electrolyte across a plasma membrane is dependent upon the
  2. Electrolyte’s concentration gradient
  3. The membrane potential
  4. A & B
  5. None of the above
  1. Phospholipids spontaneously arrange themselves into a bilayer because
  2. Of their amphipathic condition
  3. Of the attractive force of Van der Waals interactions
  4. Of hydrogen bonding between the hydrocarbon tails and water
  5. Of the hydrophobic nature of the phosphate heads
  1. True or False. Free ribosomes and attached ribosomes are structurally and functionally different.
  2. True
  3. False
  1. True or False. The cis face of the Golgi apparatus receives vesicles budding off from the Endoplasmic Reticulum (ER).
  2. True
  3. False
  1. True or False. The lumen of the Endoplasmic Reticulum is continuous with the extracellular environment.
  2. True
  3. False
  1. Plasma membrane proteins synthesized in the ER are transferred through the cell via
  2. Cisterna
  3. Tubulin
  4. Vesicles
  5. Lysosomes
  1. Cholesterol is
  2. A pH buffer
  3. A fluidity buffer
  4. Amphipathic
  5. B & C only
  6. All of the above
  1. According to the fluid mosaic model of cellular membranes, which of the following is NOT true?
  2. the phospholipid bilayer is in a liquid state
  3. phopholipids can diffuse laterally
  4. all proteins embedded in the membrane are held tightly in place
  5. None of the above
  1. Allosteric regulation of a protein
  2. Changes the tertiary structure of the protein
  3. Changes the affinity of the protein for its substrates (ions)
  4. Changes the primary structure of the protein
  5. A & B only
  6. All of the above