In addition to a plasma membrane, eukaryotic cell...

Name: Problem 2, Chapter 5: Biology for AP Courses
Uploaded: 2019-07-26T13:40:24-08:00
Duration: 4 min 20 s
Channel: Nalvi Duro
Description: In addition to a plasma membrane, eukaryotic cell organelles, such as mitochondria, also have membranes. In which way would these membranes differ? a. The proportion of phosphate within the phospholipids will vary. b. Only certain membranes contain phospholipids. c. Only certain membranes are selectively permeable. d. The proportions of proteins, lipids, and carbohydrates will vary.

In addition to a plasma membrane, eukaryotic cell organelles, such as mitochondria, also have membranes. In which way would these membranes differ? a. The proportion of phosphate within the phospholipids will vary. b. Only certain membranes contain phospholipids. c. Only certain membranes are selectively permeable. d. The proportions of proteins, lipids, and carbohydrates will vary.

In addition to a plasma membrane, eukaryotic cell organelles, such as mitochondria, also have membranes. In which way would these membranes differ?
a. The proportion of phosphate within the phospholipids will vary.
b. Only certain membranes contain phospholipids.
c. Only certain membranes are selectively permeable.
d. The proportions of proteins, lipids, and carbohydrates will vary.

Key Concepts

Biological Membranes

Biological membranes are fundamental structures in cells that serve as barriers to separate cellular compartments. They are primarily composed of a lipid bilayer along with embedded proteins and carbohydrates, which work together to maintain cell integrity, facilitate communication, and regulate the transport of substances across the membrane.

Membrane Composition Diversity

Different cellular membranes vary in their relative proportions of proteins, lipids, and carbohydrates. This diversity in composition allows specific membranes, such as the mitochondrial membrane versus the plasma membrane, to have unique properties and functions optimized for their roles within the cell.

Selective Permeability

Selective permeability is a key feature of biological membranes, referring to their ability to regulate the entry and exit of molecules. This property is achieved through the combination of lipid matrix characteristics and the presence of specific transport proteins, ensuring that organelles maintain distinct internal environments necessary for proper cellular function.

Transcript

00:01 So here we're being asked to evaluate how membranes that are found in different structures differ from each other.

00:13 So first of all, what is the purpose of membranes? the purpose of the membrane is to create a compartment so that a specific set of reactions can be carried out in that compartment.

00:25 So you have a membrane that right here, which is basically, the cell membrane and the point of the cell membrane is to define the cell and control what goes in and what comes out of the cell.

00:43 So exchange of nutrients.

00:45 And you need exchange of nutrients and waste so that you can get new material to carry out your light functions and expel what you don't need.

00:57 And what i've drawn here is just three organelles that are your typical organelles.

01:04 And the organelles are the same.

01:06 In order for them to perform their functions, stuff needs to go in and stuff needs to come out of all of these guys.

01:14 Right.

01:15 So the golgi, whatever it makes, it needs to come out of the golgi and the materials that it needs to make that with, they need to come in.

01:22 And same thing with the nucleus.

01:24 So, as you can imagine, the functions of all of these different compartments are different.

01:33 So the plasma membrane needs to be different from the membrane of the mitochondria, that needs to be different from the membrane of the golgi and so on.

01:43 So depending on the specific function that a compartment needs to carry, you need to change the membrane accordingly.

01:52 Now, how do you do that? so what i have here on the right is a diagram of the lipid bilayer with its different components in it.

02:02 So lipid bilayer has phospholipids, which are these little blue balls with the two yellow legs.

02:10 So that is essentially the basic function or the basic structure of a phospholipid.

02:18 It has a phosphate group and two fatty acid chains from that phosphat...

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