Metabolism and Enzyme Functionality

The video explores metabolism, the sum of all reactions in cells or bodies, in plants and animals. It covers glucose conversion to starch and cellulose in plants, and glycogen and urea in animals. Enzymes play a crucial role in these reactions, influenced by factors like temperature and pH.

What is the definition of metabolism?

• The conversion of light energy into chemical energy.

• The breakdown of food in the stomach.

• The sum of all chemical reactions in a cell or organism.

• The process of photosynthesis in plants.

Which substance is glucose converted into for storage in plants?

• Glycogen

• Protein

• Cellulose

• Starch

What is the role of cellulose in plants?

• Energy storage

• Building cell walls

• Transporting nutrients

• Photosynthesis

What are lipids composed of?

• Glycerol and fatty acids

• Nitrates and glucose

• Amino acids and proteins

• Glucose and starch

Which process is common to both plants and animals?

• Glycogen storage

• Cellulose production

• Respiration

• Photosynthesis

In animals, what is glucose converted into for energy storage?

• Glycogen

• Lipids

• Cellulose

• Starch

What happens to excess amino acids in the body?

• They are converted into glucose.

• They are used for energy.

• They are converted into urea.

• They are stored as proteins.

What controls all metabolic reactions?

• Enzymes

• Light

• Water

• Temperature

Which factor does NOT affect enzyme activity?

• Enzyme concentration

• Light intensity

• pH levels

• Temperature

What can affect the functioning of enzymes?

• Presence of oxygen

• Lack of water

• High or low pH

• Excessive light