Cells

The movement of molecules across a membrane from high concentration to low concentration is called:

• Osmosis
• Diffusion
• Endocytosis
• Active Transport

The most modern version of the cell membrane model was developed by:

• Singer & Nicolson
• Davson & Danielli
• Watson & Crick
• Banting & Best

The molecule responsible for allowing water to flow across the membrane is:

• Glycolipids
• Glycoproteins
• Aquaporins
• Cholesterol

The molecule below that will not easily enter the cell by simple diffusion is:

• CO₂
• O₂
• Water
• Methane

Active Transport typically uses ______ to transport materials across the cell membrane.

• ATP
• Glucose
• Na+
• K+

The red blood cells in solution A are in a ____________ environment

• Acidic
• Isotonic
• Hypotonic
• Hypertonic

Tags

NGSS.MS-LS1-5

The red blood cells in solution C are in a ____________ environment

• Acidic
• Isotonic
• Hypotonic
• Hypertonic

Tags

NGSS.HS-LS1-3

A Hypotonic solution contains an excess amount of:

• Na⁺
• H⁺
• Solute
• Water

Tags

NGSS.MS-PS1-2

The Na/K Pump moves Na & K ions across the membrane at a ratio of ___ Na : ___ K.

• 2:1
• 3:2
• 2:3
• 1:2

Other common examples of ion pumps include:

• Proton (H⁺) Pumps
• Aquaporins
• Ionophores
• K⁺ Leak Channels