Carbohydrates Overview Quiz
26 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the general molecular formula for carbohydrates?

  • CnH2nOn
  • Cn(H2O)n (correct)
  • CH2O
  • C6H12O6
  • Which of the following is NOT a function of carbohydrates in the body?

  • Serving as a form of structural support
  • Providing energy through oxidation
  • Supplying carbon for the synthesis of cell components
  • Acting as a primary component of nucleic acids (correct)
  • What is the name for a carbohydrate composed of two simple sugar molecules bound together?

  • Polysaccharide
  • Oligosaccharide
  • Disaccharide (correct)
  • Monosaccharide
  • Which of the following is an example of a monosaccharide?

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

    Based on the given text, what is the recommended daily intake of carbohydrates?

    <p>225-325g (D)</p> Signup and view all the answers

    Which of the following sugars is NOT a disaccharide?

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

    Which of the following is a major degradation product of starch?

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

    Which of the following is NOT a characteristic of amylopectin?

    <p>It is a simple sugar. (A)</p> Signup and view all the answers

    What is the primary storage form of glucose in animals?

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

    Which of the following polysaccharides is commonly found in plants?

    <p>Both B and C (D)</p> Signup and view all the answers

    What is the primary role of glucose in the body?

    <p>To store energy (A)</p> Signup and view all the answers

    What is the difference between homopolysaccharides and heteropolysaccharides?

    <p>Homopolysaccharides are composed of a single type of monosaccharide, while heteropolysaccharides are composed of multiple types of monosaccharides. (C)</p> Signup and view all the answers

    Which of the following disaccharides is found in milk?

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

    Based on its chemical structure, a pentose carbohydrate would have which molecular formula?

    <p>C5H10O5 (C)</p> Signup and view all the answers

    Which of the following accurately describes the structure and function of amylose and amylopectin?

    <p>Amylose is a linear polymer of glucose units linked by (1,4) glycosidic bonds, while amylopectin is a branched polymer with both (1,4) and (1,6) glycosidic bonds. (A)</p> Signup and view all the answers

    Which of the following statements about monosaccharides is NOT true?

    <p>Monosaccharides are typically insoluble in water due to their high molecular weight. (C)</p> Signup and view all the answers

    What is the main structural difference between glycogen and amylopectin?

    <p>Glycogen has shorter branches than amylopectin. (D)</p> Signup and view all the answers

    Which monosaccharide is considered the sweetest, with a sweetness level 73% higher than sucrose?

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

    What is the primary difference between β-D-ribose and β-D-deoxyribose?

    <p>β-D-deoxyribose lacks an oxygen atom on one of its carbon atoms. (D)</p> Signup and view all the answers

    What is the primary function of cellulose?

    <p>Provides structure and strength to plants. (B)</p> Signup and view all the answers

    Which of the following statements correctly describes the relationship between glucose and glycogen?

    <p>Glycogen is a polymer of glucose. (C)</p> Signup and view all the answers

    Which of the following is NOT a correct statement about the physical properties of monosaccharides?

    <p>Monosaccharides are soluble in water due to their high molecular weight. (D)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of cellulose?

    <p>It is easily digestible by most animals. (C)</p> Signup and view all the answers

    What is the key role of β-D-galactose?

    <p>It combines with glucose to form lactose (milk sugar). (D)</p> Signup and view all the answers

    Which of the following pairs represents sugar and its relative sweetness?

    <p>Xylose: 0.16 (A)</p> Signup and view all the answers

    What type of carbohydrate is 'invert sugar' and what are its components?

    <p>Mixture of glucose and fructose (B)</p> Signup and view all the answers

    Flashcards

    Carbohydrates

    Biomolecules that provide energy, carbon for synthesis, and stored energy.

    Monosaccharides

    The simplest form of carbohydrates; single sugar molecules.

    Disaccharides

    Carbohydrates formed by two monosaccharides bonded together.

    Polysaccharides

    Long chains of ten or more monosaccharides linked together.

    Signup and view all the flashcards

    Daily carbohydrate intake

    Recommended daily intake of carbohydrates is 225-325g.

    Signup and view all the flashcards

    General structure of carbohydrates

    Molecular formula is Cn(H2O)n, indicating a hydrate of carbon.

    Signup and view all the flashcards

    Sweetness of sugars

    Monosaccharides tend to be sweet, with fructose being the sweetest.

    Signup and view all the flashcards

    Solubility of monosaccharides

    Monosaccharides are extremely soluble in water due to many OH groups.

    Signup and view all the flashcards

    Important monosaccharides

    Specific monosaccharides include β-D-ribose, β-D-deoxyribose, and β-D-galactose.

    Signup and view all the flashcards

    β-D-ribose

    A monosaccharide that forms the backbone of RNA.

    Signup and view all the flashcards

    β-D-glucose

    A common monosaccharide important in energy metabolism.

    Signup and view all the flashcards

    β-D-fructose

    Also known as fruit sugar, is sweeter than glucose.

    Signup and view all the flashcards

    Amylose

    A glucose polymer with α(1,4) glycosidic bonds.

    Signup and view all the flashcards

    Amylopectin

    A glucose polymer with α(1,4) bonds and branches via α(1,6) linkages.

    Signup and view all the flashcards

    Glycogen

    Major carbohydrate storage in animals, similar to amylopectin but more branched.

    Signup and view all the flashcards

    Cellulose

    A linear chain of glucose with β(1,4) glycosidic bonds; major part of plant structure.

    Signup and view all the flashcards

    Glycogenin

    Two molecules that initiate glycogen formation and branching.

    Signup and view all the flashcards

    Fructose

    The sweetest monosaccharide, found in honey and fruits.

    Signup and view all the flashcards

    Glucose

    A monosaccharide metabolized by the body for energy.

    Signup and view all the flashcards

    Sucrose

    A disaccharide formed from glucose and fructose; common table sugar.

    Signup and view all the flashcards

    Lactose

    Disaccharide found in milk, composed of glucose and galactose.

    Signup and view all the flashcards

    Starch

    Polysaccharide used to store glucose in plants, occurs in roots.

    Signup and view all the flashcards

    Study Notes

    Introduction to Biology - Lecture 4

    • Lecture delivered by Allen Cheung on January 22, 2025
    • Course: BIOL 1005 Introduction to Biology
    • Lecture focused on Carbohydrates

    Macronutrients

    • Macromolecules categorized as Carbohydrates, Proteins, and Fats
    • Key dietary components for energy and cellular function

    Carbohydrates

    • Sugars: Found in various foods (rice, noodles, bread, cakes, snacks)
    • Body Function: Essential for cellular and bodily functions
    • Brain Fuel: The brain requires glucose (110-145g per day) for proper functioning
    • Daily Intake Recommendations: 225-325g per day

    What are Carbohydrates?

    • Classified as biomolecules alongside lipids, proteins, and nucleic acids
    • Compounds of immense importance for biological processes
    • Energy Source: Provide energy via oxidation
    • Cell Building Blocks: Supply carbon for creating cell components
    • Stored Energy: Act as stored chemical energy
    • Structural Components: Part of the structures of cells and tissues

    Carbohydrate Structure

    • General Molecular Formula: Cn(H₂O)n (a hydrate of carbon)
    • Basic Building Blocks: Monosaccharides (simple sugars) are the fundamental units
    • Chain Structure: A single continuous carbon chain. Glucose structural representation can be in different forms (straight chain, ring, simplified ring).

    Carbohydrate Classification

    • Monosaccharides: Simplest form of carbohydrates
    • Disaccharides: Two monosaccharides linked together
    • Oligosaccharides: 3-10 monosaccharide units
    • Polysaccharides: More than 10 monosaccharide units

    Important Monosaccharides

    • D-Ribose: Component of RNA (ribonucleic acid)
    • D-Deoxyribose: Component of DNA (deoxyribonucleic acid)
    • D-Galactose: Part of lactose, a milk sugar
    • D-Glucose: Also known as dextrose or blood sugar, found in honey, fruits; crucial for energy production
    • D-Fructose: Sweetest monosaccharide, found in fruits, honey, corn syrup

    Physical Properties of Monosaccharides

    • Sweet taste (fructose is the sweetest; 73% sweeter than sucrose)
    • Solids at room temperature.
    • Highly soluble in water (due to many hydroxyl groups)

    Disaccharides

    • Formed by linking two monosaccharides via a glycosidic bond
    • Physiologically important disaccharides include sucrose, lactose, and maltose

    Polysaccharides

    • Composed of more than ten monosaccharides
    • Types: Homopolysaccharides (one type of monosaccharide) and Heteropolysaccharides (multiple types)
    • Main building block in polysaccharides is D-glucose.

    Examples of Homopolysaccharides

    • Starch: Storage carbohydrate in plants as granules
    • Dextrin: Intermediate product in starch digestion
    • Glycogen: Storage carbohydrate in animals, primarily in liver and muscle cells
    • Cellulose: Main structural component in plant cell walls
    • Chitin: Structural component of exoskeletons and fungal cell walls

    Storage of Excess Sugars (Carbs)

    • Plants store glucose as starch in their roots.
    • Animals store glucose as glycogen in liver and muscle.

    Starch—Composition

    • Mixture of amylose and amylopectin
    • Amylose: Linear glucose polymer with α(1,4) linkages
    • Amylopectin: Branched glucose polymer with α(1,4) linkages and α(1,6) branch points.

    Glycogen

    • Storage form of glucose in animals
    • Highly branched, like amylopectin, with α(1,6) branch linkages every 10 residues. Primarily stored as granules.

    Cellulose

    • Abundant organic molecule in nature
    • Structural component of plant cell walls
    • Composed of long chains of glucose monomers joined by β(1,4) linkages. This linkage is important as it cannot be digested by humans.

    Summary of Carbohydrates

    • Classification of carbohydrates
    • Key monosaccharides and disaccharides
    • Properties of different types of carbohydrates (polysaccharides)
    • Storage forms of carbohydrates in plants and animals

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Description

    Test your knowledge on the structure, functions, and types of carbohydrates in this comprehensive quiz. Explore questions about simple sugars, polysaccharides, and their roles in the human body. Perfect for students studying biology or nutrition.

    More Like This

    Carbohydrates and Their Functions
    15 questions

    Carbohydrates and Their Functions

    WellPositionedEnglishHorn4373 avatar
    WellPositionedEnglishHorn4373
    Importance of Carbohydrates
    40 questions
    Carbohydrates and Their Functions
    42 questions
    Use Quizgecko on...
    Browser
    Browser