Cell Membrane Transport Mechanisms Quiz

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In passive diffusion, how do molecules move?

From a region of lower concentration to higher concentration

From a region of higher concentration to lower concentration (correct)

Against the concentration gradient

By active transport across a selectively permeable membrane

Which transport mechanism requires a large concentration gradient for adequate nutrient uptake?

Gram-positive cell wall transport

Active transport (correct)

Gram-negative cell wall transport

Facilitated diffusion

What is a key feature of facilitated diffusion?

Movement from lower to higher concentration

Requires energy input

Uses protein channels or carriers (correct)

Movement against the concentration gradient

Which type of transport mechanism is crucial for nutrient uptake in microorganisms?

Active transport Signup and view all the answers

What differentiates active transport from passive diffusion?

Utilizes energy and pumps molecules against the gradient Signup and view all the answers

How do microorganisms primarily take in dissolved particles?

Diffusion through lipid bilayers Signup and view all the answers

What is the main difference between macronutrients and trace elements?

Macronutrients are needed in larger quantities than trace elements. Signup and view all the answers

Which of the following best describes facilitated diffusion?

Passive movement of molecules across a membrane down their concentration gradient with the help of channel proteins. Signup and view all the answers

How do Gram-positive and Gram-negative cell walls differ?

Gram-positive cell walls have a thick layer of peptidoglycan, while Gram-negative cell walls have a thin layer of peptidoglycan. Signup and view all the answers

What is the primary function of active transport in bacterial cells?

To move solutes from an area of low concentration to an area of high concentration using energy. Signup and view all the answers

What is the structure responsible for providing rigidity to bacterial cell walls?

Peptidoglycan Signup and view all the answers

Which process involves the simultaneous transport and chemical modification of substances as they cross the plasma membrane?

Group translocation Signup and view all the answers

What type of transport is characterized as not being energy-dependent?

Facilitated diffusion Signup and view all the answers

Which substances can easily cross the plasma membrane via passive diffusion?

H2O, O2, and CO2 Signup and view all the answers

In what direction does the movement occur in active transport?

From low to high concentration Signup and view all the answers

Which cell wall component contributes significantly to protecting bacterial cells from osmotic stress and toxic materials?

Peptidoglycan Signup and view all the answers

Which type of bacteria has a thicker peptidoglycan layer: Gram-positive or Gram-negative?

Gram-positive Signup and view all the answers

What type of proteins help facilitate substances passing through the plasma membrane by forming pores?

Channel proteins Signup and view all the answers

Cell Membrane Transport Mechanisms Quiz

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