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Chapter 3

Cytoplasmic Membrane

QuestionsAnswers
Q: Prokaryotic cells have no mitochondria so where do they produce their energy? A: In the cytoplasmic membrane.
Q: Name two functions of the cytoplasmic membrane. A: It defines the boundary and serves as a semi permeable barrier.
Q: According to our lecture, what lies within the cytoplasmic membrane? A: Ribosomes, nucleoid, and storage granules.
Q: According to our lecture, what lies outside the cytoplasmic membrane? A: Outside the cytoplasmic membrane is the cell wall and outside of the cell wall is the glycocalyx.
Q: What is the structure of the cytoplasmic mambrane? A: It is a lipid bylayer with embedded proteins.
Q: True or false? The cytoplasmic membrane is embedded with more than 200 different proteins. A: True!
Q: What purpose do proteins embedded in the cytoplasmic membrane serve? A: They serve as receptors and transport gates.
Q: The proteins of the cytoplasmic membrane are not stationary. What is this arrangement referred to as? A: The fluid mosaic model.
Q: How do molecules pass through the cytoplasmic membrane? A: Via simple diffusion or transport mechanisms.
Q: True or false? Simple diffusion requires no energy. A: True!
Q: What is it called when water is the molecule involved in simple diffusion? A: Osmosis.
Q: What prevents the cytoplasmic membrane from rupturing under osmotic pressure? A: The rigid cell wall.
Q: What is the name of the mechanism used to produce energy in the cytoplasmic membrane? A: Just like in mitochondria of eukaryotic cells, bacteria use an electron transport chain.
Q: The electron transport chain utilizes proton motive force. What is proton motive force? A: Simply put, it's a proton gradient.
Q: Name three types of transport systems used by prokaryotic cells. A: Facilitated diffusion, active transport, and group translocation.
Q: What is another name for transport proteins? A: Permeases or carriers.
Q: Does facilitated diffusion take place down a concentration gradient or against a concentration gradient? A: Down a concentration gradient.
Q: True or false? Facilitated diffusion requires no energy. A: True!
Q: Give an example of facilitated diffusion. A: The movement of glycerol into the cell.
Q: Does active transport take place down a concentration gradient or against a concentration gradient? A: Against a concentration gradient.
Q: What are the two primary mechanisms of active transport? A: Proton motive force and ATP Binding Cassette system.
Q: We already know proton motive force is the use of a proton gradient but what in the world is the ATP Binding Cassette system? A: It's the use of binding proteins to scavenge and deliver molecules to the transport complex (they go out there and get stuff).
Q: Give an example of ATP Binding Cassette system. A: The transport of maltose.
Q: What is group transport? A: The thing to remember about group transport is that it chemically alters molecules which then become trapped within the cell.
Q: True or false? Group transport does not alter the concentration gradient. A: True! It actually changes the molecule.
Q: Give an example of group transport. A: The phosphotransferase system.
This MICROBIOLOGY stack covers the section of chapter 3 entitled CYTOPLASMIC MEMBRANE. (blank)
Created by: PCC Microbiology
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