IB Biology Topic 9

A phospholipid has 2 parts. What are they called? 

• Hydrophilic Head, Hydrophobic Tail 

• Hydrophobic Head, Hydrophilic Tail 

Tags

NGSS.MS-LS1-2

What are the three main properties of water?

• solid, low specific heat capacity, buoyancy

• gas, low specific heat capacity, viscosity

• liquid, high specific heat capacity, surface tension

• solid, low specific heat capacity, adhesion

Tags

NGSS.MS-ESS2-4

Explain the concept of polarity in water molecules.

• Absence of electrical charge within the molecule

• Equal distribution of electrical charge within the molecule

• Uneven distribution of electrical charge within the molecule

• Polarity refers to the shape of the water molecule

Why is water considered a universal solvent?

• Water is considered a universal solvent because it is made up of many different elements.

• Water is considered a universal solvent because it is highly acidic.

• Water is considered a universal solvent because it has a low boiling point.

• Water is considered a universal solvent because it has the ability to dissolve a wide variety of substances due to its polar nature.

How does water play a crucial role in biological systems?

• Water is the main component of cells and is involved in various metabolic processes.

• Water is harmful to biological systems.

• Water is only important for hydration.

• Water has no role in biological systems.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Describe the process of cohesion and adhesion in water.

• Cohesion is the attraction between water molecules, causing them to stick together. Adhesion is the attraction between water molecules and other substances, causing them to stick to surfaces.

• Cohesion is the attraction between water molecules, causing them to stick to surfaces. Adhesion is the attraction between water molecules and other substances, causing them to stick together.

• Cohesion is the attraction between water molecules, causing them to repel each other. Adhesion is the attraction between water molecules and other substances, causing them to repel from surfaces.

• Cohesion is the repulsion between water molecules, causing them to separate. Adhesion is the repulsion between water molecules and other substances, causing them to separate from surfaces.

Hydrophilic means...

• water-loving

• water-fearing

• nonpolar

• lipid soluble

A ______________ is composed of a phosphate and glycerol head and 2 fatty acid chain tails. 

• phospholipid 

• Carbohydrate

• Cholesterol 

• Protein 

Tags

NGSS.MS-LS1-2

At room temperature, water is a liquid and methane is a gas. Which molecular property explains this difference?

• Higher molecular mass of water

• Dipolarity of water

• Presence of more hydrogen in methane

• Higher boiling point than methan

Which substance is more likely to dissolve in water?

• Hydrophillic

• Hydrophobic