BIO11 Unit 1, Topic 1 Quiz 1

How does the cell membrane maintain relatively stable internal conditions via passive movement?

• A) Active transport of substances against a concentration gradient.

• B) Facilitated diffusion of all substances across the membrane.

• C) Osmosis of water molecules.

• D) Passive movement of some substances along a concentration gradient.

Which of the following processes allows the cell membrane to maintain stable internal conditions without requiring energy input?

• A) Active transport

• B) Endocytosis

• C) Facilitated diffusion

• D) Diffusion

When solute particles move from an area of high concentration to low concentration through the cell membrane without the need for energy, it is an example of:

• A) Active transport

• B) Osmosis

• C) Passive transport

• D) Endocytosis

Which process involves the movement of water molecules across a selectively permeable membrane to equalize solute concentrations?

• A) Active transport

• B) Facilitated diffusion

• C) Osmosis

• D) Endocytosis

What type of transport allows specific substances to move across the cell membrane with the assistance of transport proteins?

• A) Active transport

• B) Facilitated diffusion

• C) Osmosis

• D) Pinocytosis

What is the fundamental structural feature of the cell membrane according to the fluid mosaic phospholipid bilayer model?

• A) A single layer of phospholipids

• B) A rigid protein framework

• C) A mosaic of carbohydrates

• D) A double layer of phospholipids

Which component of the cell membrane is responsible for forming a hydrophobic core, separating the internal and external environments of the cell?

• A) Cholesterol molecules

• B) Protein channels

• C) Glycoproteins

• D) Phospholipids

What is the role of cholesterol in the structure of the cell membrane?

• A) Facilitating the movement of ions

• B) Providing rigidity and stability

• C) Acting as enzymes for metabolic reactions

• D) Transporting lipids across the membrane

Which component of the cell membrane is responsible for facilitating the selective transport of ions and molecules across the membrane?

• A) Cholesterol molecules

• B) Glycoproteins

• C) Phospholipids

• D) Protein channels

In the fluid mosaic model of the cell membrane, what gives the membrane its 'mosaic' appearance?

• A) The random distribution of phospholipids

• B) The uniform arrangement of cholesterol molecules

• C) The even distribution of glycoproteins

• D) The diverse arrangement of proteins and carbohydrates