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Transport cellulaire

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Questions and Answers

Quel type de transport cellulaire nécessite de l'énergie pour déplacer les molécules à travers la membrane plasmique?

Transport actif (correct)

Osmose

Diffusion facilitée

Diffusion simple

Quelle est la principale différence entre la diffusion facilitée et la diffusion simple?

La diffusion simple nécessite une membrane semi-perméable

La diffusion facilitée nécessite un transporteur (correct)

La diffusion simple se produit uniquement dans des solutions diluées

La diffusion facilitée se produit dans des solutions concentrées uniquement

Quel facteur n'influence pas le taux de transport à travers une membrane cellulaire?

Température

Type de membrane

Taille de la cellule (correct)

Concentration du soluté

Dans quel type de transport les molécules se déplacent-elles du milieu le plus concentré vers le moins concentré?

Diffusion simple Signup and view all the answers

Quel mécanisme cellulaire est responsable de l'absorption des nutriments par endocytose?

Pinocytose Signup and view all the answers

What is the role of membrane transport proteins in cellular transport?

They facilitate the passive movement of molecules across the membrane. Signup and view all the answers

Which of the following best describes active transport?

It requires energy to move substances against their concentration gradient. Signup and view all the answers

Which statement about osmosis is true?

It is a type of passive transport that specifically refers to the movement of water. Signup and view all the answers

How does facilitated diffusion differ from simple diffusion?

Facilitated diffusion uses membrane proteins to assist in transport. Signup and view all the answers

What is the primary function of the sodium-potassium pump?

To maintain electrochemical gradients by transporting sodium out and potassium into the cell. Signup and view all the answers