Polysaccharides: Chitin

The video explores chitin, a polymer of carbohydrates, comparing it to cellulose. It details chitin's structure, highlighting its repeating units of N-acetyl glucosamine and its unbranched, homopolymer nature. The video discusses chitin's presence in insect exoskeletons and its strong, resilient properties due to hydrogen bonding. It explains the beta 1-4 linkage pattern and why humans cannot digest chitin, unlike alpha-linked carbohydrates like starch. The video concludes with a discussion on the role of microorganisms in digesting beta-linked polymers in some animals.

What is the primary structural difference between cellulose and chitin?

• Chitin has a beta 1 to 4 linkage, while cellulose has an alpha 1 to 4 linkage.

• Chitin is made of N-acetyl glucosamine, while cellulose is made of glucose.

• Chitin is a branched polymer, while cellulose is unbranched.

• Chitin is found in plants, while cellulose is found in insects.

What makes chitin a strong polymer?

• Its ability to dissolve in water

• Its presence in plant cell walls

• Its beta 1 to 4 linkage

• Its branched structure

Where is chitin commonly found?

• In the cell walls of plants

• In the exoskeletons of insects

• In the bones of mammals

• In the shells of mollusks

What is the linkage pattern in chitin?

• Alpha 1 to 6

• Alpha 1 to 4

• Beta 1 to 4

• Beta 1 to 6

Why are beta linkages more stable than alpha linkages?

• They allow for more hydrogen bonding

• They are easier to digest

• They are found in energy storage molecules

• They are more flexible

Which type of linkage is found in energy storage molecules like glycogen?

• Beta 1 to 4

• Alpha 1 to 4

• Beta 1 to 6

• Alpha 1 to 6

Why can't humans digest chitin?

• Humans lack the enzyme to break beta linkages

• Chitin is not present in the human diet

• Chitin is insoluble in water

• Chitin is too large to be digested

What role do microorganisms play in the digestion of cellulose in some animals?

• They prevent cellulose from being digested

• They convert cellulose into proteins

• They store cellulose for later use

• They produce enzymes that break down cellulose

What is the term used for substances like chitin and cellulose that are not digested by humans?

• Starch

• Fiber

• Lipids

• Proteins

Which enzyme is responsible for breaking down maltose in humans?

• Cellulase

• Maltase

• Amylase

• Lactase