Grade 9 Organic Compounds Quiz
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Questions and Answers

What are organic compounds made of?

Carbon and other elements such as hydrogen, oxygen, nitrogen, sulfur, or phosphorus.

How are organic compounds classified?

Organic and inorganic.

What type of compound are carbohydrates?

Organic compound.

What are the main energy source for organisms?

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

What are the three types of carbohydrates?

<p>Simple (monosaccharides), double (disaccharides), or complex (polysaccharides).</p> Signup and view all the answers

Give examples of carbohydrates.

<p>Glucose, fructose, maltose, sucrose, starch, glycogen, and cellulose.</p> Signup and view all the answers

What are lipids used for?

<p>Storing energy, acting as structural components of cell membranes, and serving as signal molecules.</p> Signup and view all the answers

What are the types of lipids?

<p>Triglycerides, steroids, or phospholipids.</p> Signup and view all the answers

What are fatty acids classified as?

<p>Saturated or unsaturated.</p> Signup and view all the answers

What are proteins made up of?

<p>Carbon, hydrogen, oxygen, and nitrogen.</p> Signup and view all the answers

What is the main characteristic that distinguishes organic compounds from inorganic compounds?

<p>They are made of carbon and hydrogen. (D)</p> Signup and view all the answers

Which type of organic compound is the main energy source for organisms and used to make cell structures?

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

Which of the following is a type of lipid?

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

What are fatty acids primarily composed of?

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

What is the main element found in proteins that is not present in carbohydrates and lipids?

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

In what branch of chemistry are organic compounds studied?

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

What type of compound is cellulose?

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

What is the primary function of lipids in organisms?

<p>Structural components of cell membranes (C)</p> Signup and view all the answers

What classifies an organic compound as a carbohydrate?

<p>Being the main energy source for organisms (C)</p> Signup and view all the answers

What distinguishes fatty acids from other organic compounds?

<p>They can be saturated or unsaturated (C)</p> Signup and view all the answers

Flashcards

Organic Compounds

Compounds containing carbon and usually bonded to hydrogen, typically associated with living organisms.

Inorganic Compounds

Compounds that do not contain carbon or are not associated with living organisms.

Carbohydrates

Organic compounds made of carbon, hydrogen, and oxygen, used for energy and cell structures.

Monosaccharides

Simple sugars; the simplest form of carbohydrates.

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Disaccharides

Double sugars; formed by joining two monosaccharides.

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Polysaccharides

Complex carbohydrates; long chains of monosaccharides.

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Glucose

A common monosaccharide, a primary energy source.

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Lipids

Organic compounds made of carbon, hydrogen, and oxygen, used for energy storage and cell structure.

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Triglycerides

A type of lipid used for energy storage.

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Fatty Acids

Building blocks of lipids.

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Proteins

Organic compounds made of chains of amino acids, perform many cell functions.

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Amino Acids

Building blocks of proteins.

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Nucleic Acids

Organic compounds that store and transmit genetic information.

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DNA

Double-stranded nucleic acid containing genetic instructions.

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RNA

Single-stranded nucleic acid involved in protein synthesis.

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Saturated Fats

Fats with the maximum number of hydrogen atoms possible; solid at room temperature.

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Unsaturated Fats

Fats with fewer than the maximum number of hydrogen atoms; liquid at room temperature.

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Cellulose

Complex carbohydrate that provides structural support in plants.

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Starch

Complex carbohydrate used for energy storage in plants.

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Study Notes

  • The text is about organic compounds in Grade 9 science.
  • Organic compounds are identified and differentiated from inorganic compounds.
  • Organic compounds are made of carbon and other elements, such as hydrogen, oxygen, nitrogen, sulfur, or phosphorus.
  • Organic compounds are classified as organic because they are associated with living organisms and are studied in organic chemistry and biochemistry.
  • Organic compounds are classified into two main groups: organic and inorganic.
  • Organic compounds contain carbon usually bonded to hydrogen.
  • Carbohydrates are a type of organic compound made up of carbon, hydrogen, and oxygen, and are the main energy source for organisms, used to make cell structures, and stored as energy in plants.
    • Carbohydrates can be simple (monosaccharides), double (disaccharides), or complex (polysaccharides).
    • Examples of carbohydrates include glucose, fructose, maltose, sucrose, starch, glycogen, and cellulose.
  • Lipids are another type of organic compound made up of carbon, hydrogen, and oxygen, and are used for storing energy, acting as structural components of cell membranes, and serving as signal molecules.
    • Lipids can be triglycerides, steroids, or phospholipids.
    • Fatty acids can be saturated or unsaturated.
  • Proteins are a type of organic compound made up of carbon, hydrogen, oxygen, and nitrogen, and consist of chains of amino acids.
    • Proteins serve many functions in cells, including being cellular structures, control substances, and for immunity.
    • Examples of proteins include hemoglobin, collagen, insulin, keratin, myoglobin, and fibrin.
  • Nucleic acids are a type of organic compound made up of carbon, hydrogen, oxygen, nitrogen, and phosphorus.
    • Nucleic acids are the molecules in cells that direct and store information for reproduction and cellular growth.
    • There are two types of nucleic acids: RNA and DNA.
    • RNA has one strand, while DNA has a double-stranded helix structure.
  • Organic compounds are important because all living organisms contain carbon, and they are the basic components of many of the cycles that drive the earth.

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Description

Test your knowledge about organic compounds in this Grade 9 science quiz. Learn about the characteristics and classifications of organic compounds, including carbohydrates, lipids, proteins, and nucleic acids.

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