Skip to main content
Ch. 3 The Cell
Amerman - Human Anatomy & Physiology 2nd Edition
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoAmerman 2nd EditionCh. 3 The CellProblema 5d
Capitolo 3, Problema 5d

Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement.
Membrane proteins often function as channels or carriers.

Guida verificata passo dopo passo
1
Understand the role of membrane proteins: Membrane proteins are integral or peripheral proteins embedded in or associated with the plasma membrane. They play various roles, including acting as channels or carriers to facilitate the movement of substances across the membrane.
Evaluate the statement: 'Membrane proteins often function as channels or carriers.' This statement is true because many membrane proteins are specifically designed to transport ions, molecules, or other substances across the plasma membrane.
Clarify the function of channels: Channel proteins form pores or openings in the membrane that allow specific ions or molecules to pass through, typically following their concentration gradient.
Clarify the function of carriers: Carrier proteins bind to specific substances on one side of the membrane, undergo a conformational change, and release the substance on the other side, often facilitating active or passive transport.
Conclude the evaluation: Since the statement is accurate, no correction is needed. Membrane proteins indeed often function as channels or carriers to support cellular transport processes.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Plasma Membrane Structure

The plasma membrane is a phospholipid bilayer that surrounds and protects the cell, providing a barrier between the internal environment and the external surroundings. It is embedded with various proteins that play critical roles in transport, signaling, and maintaining the cell's shape.
Video consigliato:
Percorso guidato
06:49
Biological Membranes

Membrane Proteins

Membrane proteins are integral or peripheral proteins that perform essential functions in the plasma membrane. They can act as channels or carriers to facilitate the movement of substances across the membrane, as well as serve as receptors for signaling molecules, contributing to cellular communication.
Video consigliato:
Percorso guidato
03:05
Types of Membrane Proteins

Transport Mechanisms

Transport mechanisms refer to the processes by which substances move across the plasma membrane. This includes passive transport, such as diffusion and osmosis, and active transport, which requires energy to move molecules against their concentration gradient, ensuring that essential nutrients enter and waste products exit the cell.
Video consigliato:
Percorso guidato
02:37
Active Transport
Pratica correlata
Domanda del libro di testo

Match the term with its appropriate definition. 

Osmosis    

Secondary active transport    

Exocytosis    

Phagocytosis    

Simple diffusion    

Primary active transport    

Pinocytosis    

Facilitated diffusion

a. Type of endocytosis in which a large particle is ingested

b. Transport across the plasma membrane against the concentration gradient via direct use of energy from ATP

c. Passive movement of solute across the plasma membrane

d. Movement of solvent from a solution of lower solute concentration to a solution of higher solute concentration

e. Passive movement of solute across the plasma membrane via a channel or carrier protein

f. Type of endocytosis in which ECF is brought into the cell in a protein-coated pit

g. Release of large substances from the cell through a vesicle

h. Transport of a substance across the plasma membrane against its concentration gradient using the energy from the 'downhill' movement of another substance

649
views
Domanda del libro di testo

Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement.

Integral membrane proteins generally span the width of the plasma membrane, whereas peripheral proteins are found on only one side of the membrane.

779
views
Domanda del libro di testo

Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement.

Membrane cholesterol is vital for cell-cell recognition.

602
views
Domanda del libro di testo

Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement.

The overall structure of the plasma membrane is a mosaic with the components locked tightly in place.

565
views
Domanda del libro di testo

Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement.

Cholesterol provides the plasma membrane with stability in the face of changing ion concentrations.

646
views
Domanda del libro di testo

What is the primary difference between active transport processes and passive transport processes?

652
views
1
rank