Biological Molecules and Reactions

This video reviews the chemical basis of life, covering atomic structure, types of bonds, and the unique properties of water. It explains how carbon forms complex organic molecules and the role of enzymes in biochemical reactions. The video also discusses the pH scale and the importance of water as a solvent.

What are the components of an atom?

• Protons, electrons, and photons

• Neutrons, electrons, and photons

• Protons, neutrons, and photons

• Protons, neutrons, and electrons

How do covalent bonds differ from ionic bonds?

• Covalent bonds involve sharing electrons, while ionic bonds involve transferring electrons.

• Covalent bonds involve transferring electrons, while ionic bonds involve sharing electrons.

• Both involve transferring electrons.

• Both involve sharing electrons.

What property of water allows it to dissolve many substances?

• Its high heat capacity

• Its polarity

• Its low density

• Its cohesion

What is the pH of pure water?

• 14

• 7

• 10

• 0

How does the pH scale measure acidity?

• On a scale from 1 to 10

• On a scale from 0 to 7

• On a scale from 0 to 14

• On a scale from 7 to 14

What makes carbon unique in forming complex molecules?

• It can form four chemical bonds.

• It can form three chemical bonds.

• It can form two chemical bonds.

• It can form five chemical bonds.

Which of the following is a polymer?

• Glucose

• Starch

• Fatty acid

• Amino acid

What is the role of enzymes in biochemical reactions?

• They increase the activation energy.

• They decrease the activation energy.

• They do not affect the activation energy.

• They stop the reaction.

What happens to an enzyme if the temperature is too high?

• It remains unchanged.

• It becomes inactive but retains its shape.

• It denatures and loses function.

• It becomes more active.

What is the effect of increasing substrate concentration on enzyme activity?

• The reaction rate stops immediately.

• The reaction rate remains constant.

• The reaction rate decreases.

• The reaction rate increases until enzymes are saturated.