Macromolecules Flashcards
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Questions and Answers

List the four major classes of macromolecules.

Carbohydrates, Lipids, Proteins, Nucleic Acids

Distinguish between monomers and polymers.

Monomers are the small molecules that make up a polymer. A polymer is a long chain of monomers connected by covalent bonds.

Distinguish between monosaccharides, disaccharides, and polysaccharides.

Monosaccharides are simple sugars; disaccharides are two monosaccharides joined by a glycosidic linkage; polysaccharides are made from a few hundred to a few thousand monosaccharides.

Describe the formation of a glycosidic linkage.

<p>Maltose is a glucose bonded through glycosidic linkage with another glucose. Carbohydrates use glycosidic linkage.</p> Signup and view all the answers

What are fats?

<p>A glycerol and 3 fatty acid chains joined at an ester linkage.</p> Signup and view all the answers

What are phospholipids?

<p>Glycerol, two fatty acids, and a phosphate group, with a hydrophobic tail.</p> Signup and view all the answers

What are steroids?

<p>Include cholesterol and certain hormones.</p> Signup and view all the answers

What is an ester linkage?

<p>A bond between a hydroxyl group and a carboxyl group.</p> Signup and view all the answers

What is a saturated fat?

<p>Fat in which all three fatty acid chains contain the maximum possible number of hydrogen atoms.</p> Signup and view all the answers

What is an unsaturated fat?

<p>Fat with less than the maximum number of hydrogens in one or more of its fatty acid chains, causing kinks due to double bonds.</p> Signup and view all the answers

Name the principal energy storage molecules of plants and animals.

<p>Plants: starch; Animals: glycogen (made in your liver).</p> Signup and view all the answers

What is a protein?

<p>Work in transport, storage, signaling, moving, enzymatic quality; an amino acid folded upon itself.</p> Signup and view all the answers

What is a polypeptide?

<p>A polymer (chain) of many amino acids linked together by peptide bonds.</p> Signup and view all the answers

List the four major components of an amino acid.

<p>An asymmetrical carbon bonded to an amino group, hydrogen, R group, and carboxyl group.</p> Signup and view all the answers

What are the two types of secondary protein structures?

<p>Alpha helix (coil) and beta pleated sheet (repeated folds).</p> Signup and view all the answers

What are four conditions under which proteins may be denatured?

<p>Extreme heat, high or low pH, ionization of liquid medium, and a change in environment.</p> Signup and view all the answers

What is a nucleotide?

<p>Monomer of nucleic acids made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base.</p> Signup and view all the answers

What is a pyrimidine?

<p>A nitrogenous base that has a single-ring structure; includes thymine, cytosine, and uracil.</p> Signup and view all the answers

What is a purine?

<p>A nitrogenous base that has a double-ring structure; includes adenine and guanine.</p> Signup and view all the answers

What is a nucleoside?

<p>Portion of a nucleotide containing nitrogenous base and five-carbon sugar.</p> Signup and view all the answers

What is ribose?

<p>A five-carbon monosaccharide found in RNA.</p> Signup and view all the answers

What is deoxyribose?

<p>A five-carbon sugar that is a component of DNA nucleotides.</p> Signup and view all the answers

Describe the three-dimensional structure of DNA.

<p>A double helix with bases of two strands pointing inward forming base pairs; purines pairing with pyrimidines; strands are anti-parallel.</p> Signup and view all the answers

What is a polymer?

<p>A long molecule consisting of many similar/identical building blocks linked by covalent bonds.</p> Signup and view all the answers

What is a monomer?

<p>Repeating units that serve as the building blocks of a polymer, but are smaller molecules.</p> Signup and view all the answers

What three macromolecules are polymers?

<p>Carbohydrates, Proteins, Nucleic Acids.</p> Signup and view all the answers

What is a dehydration reaction?

<p>When two molecules are covalently bonded to each other with the loss of a water molecule, facilitated by enzymes.</p> Signup and view all the answers

What is hydrolysis?

<p>The process of splitting two monomers with the addition of water.</p> Signup and view all the answers

What are simple sugars?

<p>Monosaccharides.</p> Signup and view all the answers

In carbohydrates, what are the monomer and polymers called?

<p>Monosaccharides.</p> Signup and view all the answers

What's a disaccharide?

<p>Consists of two monosaccharides joined by a glycosidic linkage.</p> Signup and view all the answers

Study Notes

Major Classes of Macromolecules

  • Four classes: Carbohydrates, Lipids, Proteins, Nucleic Acids

Monomers and Polymers

  • Monomers: small, individual molecules that join to form polymers
  • Polymers: long chains of monomers connected by covalent bonds

Types of Carbohydrates

  • Monosaccharides: simple sugars; basic building blocks of carbohydrates
  • Disaccharides: formed from two monosaccharides by glycosidic linkage
  • Polysaccharides: large macromolecules composed of hundreds to thousands of monosaccharides for storage or structure

Glycosidic Linkage

  • Creates bonds between glucose molecules, forming disaccharides like maltose

Lipid Structure

  • Fats: consist of glycerol and three fatty acid chains linked via ester linkage
  • Phospholipids: contain glycerol, two fatty acids, and a phosphate group; exhibit hydrophobic tails
  • Steroids: include cholesterol and functional hormones

Types of Fats

  • Saturated Fat: contains maximum hydrogen atoms in fatty acid chains, resulting in straight structures
  • Unsaturated Fat: contains fewer hydrogens due to double bonds, creating kinks in the chain

Energy Storage

  • Plants store energy primarily as starch
  • Animals store energy as glycogen, synthesized in the liver

Protein Structure and Function

  • Proteins serve in transport, storage, signaling, movement, and enzymatic functions; composed of folded amino acids
  • Polypeptides are chains of amino acids linked by peptide bonds

Amino Acid Composition

  • Four components of amino acids:
    • Asymmetrical carbon
    • Amino group
    • Hydrogen
    • R group (variable)
    • Carboxyl group

Secondary Protein Structure

  • Alpha Helix: coiled structure
  • Beta Pleated Sheet: formation of repeated folds

Protein Denaturation

  • Proteins can be denatured by extreme heat, high or low pH, ionization of medium, or environmental changes

Nucleic Acids

  • Nucleotides: building blocks of nucleic acids, consisting of a 5-carbon sugar, phosphate group, and nitrogenous base

Nitrogenous Bases

  • Pyrimidines: single-ring structure bases (thymine, cytosine, uracil)
  • Purines: double-ring structure bases (adenine, guanine)

Nucleosides and Sugars

  • Nucleosides: consist of a nitrogenous base and five-carbon sugar
  • Ribose: five-carbon sugar found in RNA
  • Deoxyribose: five-carbon sugar found in DNA

DNA Structure

  • DNA is a double helix with anti-parallel strands; base pairs consist of purines pairing with pyrimidines

Polymerization Reactions

  • Dehydration Reaction: bonds two monomers with the loss of a water molecule
  • Hydrolysis: splits polymers into monomers by adding water

Identifying Carbohydrates

  • Monomers in carbohydrates: monosaccharides; polymers are known as polysaccharides
  • Disaccharides: consist of two monosaccharides linked by a glycosidic bond

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Explore the world of macromolecules with these flashcards. Learn about the four major classes of macromolecules, understand the difference between monomers and polymers, and distinguish among various types of carbohydrates. Perfect for anyone studying biology or biochemistry.

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