Which of the following is not a function of proteins present...

Name: Problem 2, Chapter 5: Biology
Uploaded: 2019-07-06T14:38:15-08:00
Duration: 3 min 51 s
Channel: Nalvi Duro
Description: Which of the following is not a function of proteins present in the plasma membrane? a. Proteins assist the passage of materials into the cell. b. Proteins interact with and recognize other cells. c. Proteins bind with specific hormones. d. Proteins carry out specific metabolic reactions. e. Proteins produce lipid molecules.

Which of the following is not a function of proteins present in the plasma membrane? a. Proteins assist the passage of materials into the cell. b. Proteins interact with and recognize other cells. c. Proteins bind with specific hormones. d. Proteins carry out specific metabolic reactions. e. Proteins produce lipid molecules.

Which of the following is not a function of proteins present in the plasma membrane?
a. Proteins assist the passage of materials into the cell.
b. Proteins interact with and recognize other cells.
c. Proteins bind with specific hormones.
d. Proteins carry out specific metabolic reactions.
e. Proteins produce lipid molecules.

Key Concepts

Plasma Membrane Structure

The plasma membrane is the outer covering of a cell, primarily composed of a lipid bilayer interspersed with proteins. It functions as a selectively permeable barrier that regulates the entry and exit of substances, facilitates communication with the environment, and helps maintain cellular integrity.

Membrane Protein Functions

Proteins embedded in the plasma membrane perform a variety of roles such as assisting in the transport of molecules across the cell membrane, serving as receptors for hormones and other signaling molecules, mediating cell-to-cell interactions, and catalyzing specific metabolic reactions. They are essential for communication, signaling, and the maintenance of cellular function.

Lipid Synthesis Context

The synthesis of lipid molecules typically occurs in cellular structures like the endoplasmic reticulum and is not a direct function of plasma membrane proteins. While enzymes in the plasma membrane may participate in metabolic reactions, the actual production of lipids is carried out in other cellular compartments.

Transcript

00:01 All right, we are being asked about what is not a function of membrane proteins.

00:07 The primary role of the plasma membrane is to create a separation between the cell and the external environment.

00:14 However, the plasma membrane must also allow for the exchange of different kinds of molecules in order for the cell to perform its life functions.

00:23 The cell needs to take in nutrients, dispose of waste, as well as respond to a variety of extracellular signals.

00:31 An important one being growth signals.

00:34 Cancer cells, for example, ignore stop growth signals and divide uncontrollably.

00:40 A cell also needs to communicate with the other cells in the body, and it also needs to perform all of the metabolic reactions that are required for life.

00:49 A simple phospholipid bilayer on its own cannot perform all of these functions.

00:54 So there are membrane -bound proteins that allow the cell to perform these functions.

00:59 And we have the major categories that membrane proteins can be divided into over here.

01:06 Channel proteins and carrier proteins are both involved with function number one that i've written on the side here.

01:14 They're both involved with exchanging material.

01:17 The difference between the channel proteins and the carrier proteins is that carrier proteins involve a change in shape in order to allow molecules to pass across the membrane.

01:27 Whereas channel proteins are basically a tunnel that's always open.

01:33 And if this channel is specific to the particular molecule that's present, that molecule will continue to flow freely through that.

01:41 Cell recognition and junction proteins are involved with function number two that i've written here.

01:48 They're involved with cell cell communication.

01:51 Cell recognition, like the name implies, recognizes other cells...

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