Topic 4 part I

Which of the following best describes catabolic reactions?

• They build larger molecules from smaller ones.

• They break down complex molecules into simpler ones, releasing energy.

• They do not involve energy transfer.

• They occur only in muscle cells.

Autotrophs are essential to ecosystems because they:

• Provide oxygen through cellular respiration

• Decompose dead organic material

• Serve as primary producers, creating energy-rich compounds used by other organisms

• Compete with animals for food resources

Which of the following is an example of a polysaccharide?

• Glucose

• Sucrose

• Galactose

• Glycogen

Which of the following is a characteristic of reducing sugars?

• They do not react with Benedict’s solution.

• They have a free aldehyde or ketone group that can donate electrons.

• They cannot be oxidized.

• They change to blue colour after heating with Benedict's solution.

How are monosaccharides like glucose absorbed in the small intestine?

• Simple diffusion

• Active transport

• Osmosis

• Facilitated diffusion

Which of the following enzymes is involved in the breakdown of disaccharides into monosaccharides in the small intestine?

• Pepsin

• Trypsin

• Sucrase

• Lipase