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USF PCB 3023 Exam 2 Practice Questions and Answers
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USF PCB 3023 Exam 2 Practice Questions and Answers Plasma Membrane (Function) - Answer️️ -Enclose Cells, Organelles 1. Defines Boundaries to regulate chemical composition and environment 2. Define malleable borders Saturated - Answer️️ -Single Bonded Unsaturated - Answer️️ -Doubl...

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  • August 28, 2024
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©SOPHIABENNET@2024/2025 Wednesday, August 21, 2024 12:13 PM

Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences




USF PCB 3023 Exam 2 Practice
Questions and Answers

Plasma Membrane (Function) - Answer✔️✔️-Enclose Cells, Organelles

1. Defines Boundaries to regulate chemical composition and
environment

2. Define malleable borders

Saturated - Answer✔️✔️-Single Bonded

Unsaturated - Answer✔️✔️-Double Bonded

Fatty Acids - Answer✔️✔️-Monomers for Lipids

Function of Lipids - Answer✔️✔️-1. energy storage

2. cell membranes

Why Do Mitochondria have a double membrane? - Answer✔️✔️-
Prehistoric cells absorbed mitochondria (as a bacteria)

Composition of Lipid Bilayer - Answer✔️✔️-50% lipids (outnumber all
other molecules 50:1), proteins (50% of mass of membranes),
cholesterol




1

, ©SOPHIABENNET@2024/2025 Wednesday, August 21, 2024 12:13 PM

Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences




Why do lipids self-assemble in water? - Answer✔️✔️-To prevent
hydrophobic tails from touching water. Hydrophillic heads protect.
This lowers free energy (delta G).

If hydrophillic heads are exposed... - Answer✔️✔️-Delta G will
increase

Glycolipids - Answer✔️✔️-lipid with glycosidic bond to glucose in
hydrophillic head.

Antigens on Red Blood Cells are..? - Answer✔️✔️-Glycolipids

Cholesterol - Answer✔️✔️-A lipid steroid ring attached to glycerol.
Fills gaps in Plasma Membrane left by unsaturated hydrocarbon
tails. Rigid.

How many pints of Blood are in the body? - Answer✔️✔️-10 pints, on
average. When you donate blood you donate a pint. 7,000,000,000
RBCs in a single liter. Body has trillions of cells

What is Fluidity? - Answer✔️✔️-How easily lipids can move within a
membrane

What is Fluidity dependent on? - Answer✔️✔️-Temperature (if
decreased, membrane becomes gel-like)

Density of Lipids (if increased, more viscous)

Length of Lipid tails (if longer, more viscous)


2

, ©SOPHIABENNET@2024/2025 Wednesday, August 21, 2024 12:13 PM

Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences




Unsaturation/Saturation (more saturated=more rigid)

Are cells symmetrical or asymmetrical? - Answer✔️✔️-Asymmetrical.
Asymmetry established at 'birth' of the cell

What is flipase? - Answer✔️✔️-Specific catalyzed Transfer. Uses fatty
acids from cytosolic monolayer to add new membrane. Responsible
for 'flip-flop' of lipids

What is scramblase? - Answer✔️✔️-Random Catalyzed Transfer.

Where are lipids synthesized? - Answer✔️✔️-Endoplasmic Reticulum.

How are lipids synthesized in the ER transported across the cell? -
Answer✔️✔️-Via vesicles.

(EXCEPTION: Lipids for Mitochondrial Membrane and Plasmid
Membrane)

Why are cells asymmetrical? - Answer✔️✔️-1. To distinguish living
and dead cells (Phosphatadylserine (-) is transferred across
membrane during apoptosis)

2. Signal Transduction. So that extracellular signals can be relayed
through cell membrane

Types of Movement in Membrane Lipids - Answer✔️✔️-1. Lateral
Diffusion (~10^8 cm^2/sec at 310K)

2. Transverse Fluctuation


3

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