Chemical Basis of Life Unit Exam

Which of these is a pure substance that cannot be broken down by a chemical reaction?

• A compound

• A mixture

• An element

• A neuron

Match the following

• Enzyme

• A substance that binds to an enzyme

• Product

• A substance formed by a chemical reaction

• Substrate

• A protein that speeds up a chemical reaction

• Activation Energy

• The energy required to start a reaction

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Which of the following is a substance that lowers the activation energy?

• An ion

• A reactant

• A catalyst

• A substrate

Which statement is true of chemical equations?

• Reactants are on the right

• Products are on the right

• Products have fewer atoms than reactants

• Reactants have fewer atoms than products

Tags

NGSS.HS-PS1-7

What is the relationship between a solution and a mixture?

What is the relationship between pH and a buffer?

What is the relationship between a solvent and a solute?

Which is a substance that produces OH- ions when it is dissolved in water?

• A base

• An acid

• A buffer

• Salt

Carbohydrates, lipids, proteins, and nucleic acids are ​ (a)   . Proteins are made from ​ (b)   that are joined by peptide bonds. ​ (c)   make up fats, oils, and waxes. DNA and RNA are examples of ​ (d)  

• macromolecules
• Amino acids
• Lipids
• nucleotides

Sugar dissolves easily in water. What property does this show?

• sugar is acidic

• Sugar has ionic bonds

• Sugar molecules are polar

• Sugar is more dense than water