Digestion Process and Duodenum Overview
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Questions and Answers

What connects amino acids in a protein?

  • Peptide bond (correct)
  • Covalent bond
  • Ionic bond
  • Hydrogen bond

Which of the following defines a disaccharide?

  • A complex protein
  • Two simple sugars linked together (correct)
  • Multiple sugar units
  • A single sugar

What are the three major components of a nucleotide?

  • Simple sugars, polysaccharides, lipids
  • Amino acids, peptides, fats
  • Triglycerol, fatty acids, glucose
  • Phosphate group, ribose sugar, nitrogenous base (correct)

What type of molecule primarily consists of glycerol and fatty acids?

<p>Fats (C)</p> Signup and view all the answers

What is the sugar component called in nucleic acids?

<p>Ribose (C)</p> Signup and view all the answers

Which of the following is a basic sugar unit?

<p>Monosaccharide (A)</p> Signup and view all the answers

How many fatty acid tails are present in a triglyceride?

<p>Three (B)</p> Signup and view all the answers

What is the process called that breaks down macromolecules for absorption?

<p>Digestion (B)</p> Signup and view all the answers

What is the role of peptidases in protein digestion?

<p>To break peptide bonds in proteins (C)</p> Signup and view all the answers

What must happen to trypsinogen before it can function as an enzyme?

<p>It must undergo a cleavage to become trypsin (A)</p> Signup and view all the answers

Which enzyme is responsible for breaking down lactose in carbohydrates?

<p>Lactase (B)</p> Signup and view all the answers

What can result from the loss of lactase due to inflammation in the duodenum?

<p>Temporary lactose intolerance (A)</p> Signup and view all the answers

Which type of bond does amylase help to break down?

<p>Glycosidic bonds (B)</p> Signup and view all the answers

Nucleosidases are specifically responsible for breaking which type of bond?

<p>Phosphate bond (B)</p> Signup and view all the answers

What is the main function of bile secreted by the liver and gall bladder in digestion?

<p>To emulsify fats (B)</p> Signup and view all the answers

After carbohydrate digestion, the basic unit that is primarily absorbed is called?

<p>Monosaccharide (D)</p> Signup and view all the answers

What happens to chymotrypsinogen before it can effectively break peptide bonds?

<p>It must undergo a cleavage to become chymotrypsin (B)</p> Signup and view all the answers

Which of the following enzymes is involved in breaking down glycosidic bonds?

<p>Amylase (B)</p> Signup and view all the answers

Study Notes

Digestion Process and Macromolecules

  • Digestion involves breaking down four major macromolecules: proteins, carbohydrates, nucleotides, and fats.

Proteins

  • Comprised of chains of amino acids linked by peptide bonds.
  • Enzymes called peptidases, present at the brush border of the intestines, break peptide bonds.
  • The pancreas secretes inactive forms of enzymes: trypsinogen and chymotrypsinogen, which require activation.
  • Enteropeptidase, from the brush border, activates trypsin and chymotrypsin, allowing them to further digest proteins into amino acids for absorption.

Carbohydrates

  • Made of repeating units of simple sugars.
  • Single sugars are monosaccharides, two are disaccharides (e.g., lactose), and multiple sugars are polysaccharides.
  • Amylase secreted by the pancreas helps break glycosidic bonds in carbohydrates.
  • Brush border enzymes, such as lactase, are specific for breaking down disaccharides like lactose.
  • Lactose intolerance can occur temporarily when inflamed duodenum walls reduce lactase production.

Nucleotides

  • Form nucleic acids like DNA and consist of a phosphate group, ribose sugar, and a nitrogenous base (e.g., adenine, guanine).
  • Nucleosidases at the brush border isolate the base from the nucleoside by cleaving bonds, leaving the ribose sugar attached to a phosphate group.

Fats

  • Composed of a glycerol head attached to three fatty acids.
  • Bile from the liver and gall bladder emulsifies fats, aiding in their breakdown.
  • Lipase, produced by the pancreas, breaks down fats by cleaving fatty acids from the triglyceride, leaving distinct fatty acid chains.

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Description

Explore the fascinating process of digestion with a focus on the duodenum and the four major macromolecules that constitute our body. This quiz covers the essentials of proteins, carbohydrates, and more, highlighting their roles and interactions in digestion.

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