Biochemistry

Which of these is NOT true.

• Enzymes can denature (change shape) when the temperature gets too high.
• Enzymes can only be used once in a chemical reaction. 
• Enzymes can denature when the pH changes. 
• Enzymes speed up chemical reactions. 

Attractions between different water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Tags

NGSS.HS-PS1-3

According to the pH range which substance is more acidic than lemon juice

• Hydrochloric acid
• cabbage
• milk

Tags

NGSS.MS-PS1-2

What is the attraction between molecules of different substances?

• Adhesion
• Suspension
• Cohesion
• Solution

What is a catalyst?

• Process that changes one set of chemicals into another
• Element or compound that enters into a chemical reaction
• Element or compound produced by a chemical reaction
• Substance that speeds up the rate of the chemical reaction

All organic compounds contain the element

• carbon
• nitrogen
• phosphorus
• sulfur

Tags

NGSS.HS-LS1-6

Subunit is to Macrocolecule like ___ is to ____

• Building is to Bricks.
• Brick is to Building.
• Carpenter is to Building.
• Building is to Carpenter.

What property of water helps to moderate earth's temperature?

• adhesion
• chohesion
• Specific heat capacity
• Latent heat of vaporization

Tags

NGSS.HS-ESS2-5

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Tags

NGSS.MS-PS1-4

Which of the following is LEAST likely to dissolve in water?

• nonpolar fats and oils
• polar sugar molecules
• salt made of a positive sodium ion and a negative chloride ion
• all of the substances will dissolve easily in water

Tags

NGSS.HS-PS1-3