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Cell Biology Multiple Choice 1. Which of the following size relationships is most correct? A: The...

Cell Biology Multiple Choice

1. Which of the following size relationships is most correct?

A: The membrane of a vesicle> E. Coli > mitochondria

B: Yeast cell > E.Coli > epithelial cell

C: mitochondria > vesicle > plasma membrane (thickness)

D: Oocyte > sperm (head) > epithelial cell

E: Oocyte > E.Coli > Yeast cell

2. Which of the following processes can be readily studied in the budding yeast Saccaromyces cerevisae?

A: Heart development

B: Protein transport

C: Immune response

D: Nuclear envelope breakdown during mitosis

E: Cell adhesion

3. Why is cholesterol able to integrate into a lipid bilayer?

A: Because it is a bulky steroid

B: Because it is a principal sterol synthesized by all animals

C: Because it binds covalently to phospholipids

D: Because it has an amphiphatic organization, similar to membrane lipids

E: Because it prevents the dense packing of phospholipids

4. Which of the following states is true for two phospholipids: phosphatidic acid (PA) and phosphatidylcholine (PC)?

A: Both are membrane proteins

B: Both have the same distribution on the membrane

C: Both have the same head group

D: Both have same degree of saturation

E: Both have an amphipathic organization

5. Which activity can only be done by a transmembrane protein?

A: To be glycosylated

B: To associate with other proteins

C: To be phosphorylated

D: To signal from one side of the membrane to the other

E: Their binding with a lipid bilayer is transient

6. One of your friends who is working in San Diego Zoo asks you to predict which of the following organisms will have the highest percentage of unsaturated fatty acid chains in their cell membranes. After analysis their cell membrane fluidity conditions, you come to the answer:

A: Polar bear

B: Desert lizard

C: Human being

D: Antarctic bacterium

E: Thermophilic bacterium

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Homework Answers

Answer #1

1.mitochondria(0.5to10um) > vesicle(50nm) > plasma membrane(10nm) (thickness)  relationships is most correct.

2.Nuclear envelope breakdown during mitosis  processes can be readily studied in the budding yeast Saccaromyces cerevisae.

3.cholesterol able to integrate into a lipid bilayer Because it has an amphiphatic organization, similar to membrane lipids.

4.Both are membrane proteins states is true for two phospholipids: phosphatidic acid (PA) and phosphatidylcholine (PC)

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