IB Bio

 What property of water makes it suitable as a coolant?

• Water is a good solvent so it can transport heat from the body
• Water molecules are cohesive and stick to the skin.
• It takes a lot of energy for water to evaporate
• It takes a lot of energy to increase the temperature of water.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is a difference between carbohydrates and lipids in energy storage?

• Carbohydrates are used for long term storage and lipids for short term storage.
• Carbohydrates contain more energy per 100g than lipids
• Carbohydrates store food only in plants whereas lipids store food in plants and animals.
• Carbohydrates are more easily transported to where energy is required than lipids.

Which molecule is a polysaccharide?

• Cellulose
• Fructose
• Maltose
• Sucrose

What are the most frequently occurring elements in living organisms?

• nitrogen, carbon, oxygen and hydrogen
• carbon, phosphorus, oxygen and nitrogen
• calcium, sodium, nitrogen and phosphorus
• calcium, phosphorus, iron and sodium

Which molecule is a monosaccharide?

• Cellulose
• Starch
• Fructose
• Maltose

What type of Molecule?

• A
• B
• C
• D

Tags

NGSS.HS-LS1-6

Which molecules show a monosaccharide and a fatty acid?

• A
• B
• C
• D

Why does exposure to high temperatures cause an enzyme to lose its biological properties? 

• The substrate blocks the active site at high temperatures
• The three dimensional structure of the enzyme becomes changed
• Chemical reactions cannot take place at high temperatures
• High temperatures increase the activation energy of reactions.

Molecules A and B are amino acids and C is a dipeptide. Which reaction represents a condensation reaction?

• A
• B
• C
• D

Tags

NGSS.HS-LS1-6

How can the activity of a human amylase enzyme be increased during a laboratory experiment? 

• Adding sugar to the mixture
• Decreasing the pH from 7 to 3C.
• Increasing the temperature from 20°C to 37°C
• Adding water to the mixture

Tags

NGSS.HS-PS1-5