Biomolecules Week 4 Lesson 3
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Questions and Answers

What characterizes organic molecules?

  • They consist only of carbon.
  • They contain nitrogen and oxygen.
  • They are chemical compounds containing both carbon and hydrogen. (correct)
  • They are found exclusively in living organisms.
  • What does the structure of methane allow for in terms of organic chemistry?

  • It prevents the formation of chains or branches.
  • It limits the formation of larger molecules.
  • It facilitates assembly into more complex structures. (correct)
  • It makes it impossible to bond with other elements.
  • Why is carbon essential in the formation of organic molecules?

  • It allows for the creation of simple linear structures.
  • It is the only element that can bond with oxygen.
  • It can form a maximum of 2 covalent bonds.
  • It has 4 electrons which facilitate the formation of 4 covalent bonds. (correct)
  • What is a key property of methane as an organic molecule?

    <p>It is a simple hydrocarbon with a tetrahedral structure.</p> Signup and view all the answers

    Which of the following elements is NOT listed as one of the important elements found in organisms?

    <p>Carbon</p> Signup and view all the answers

    Which statement about organic molecules is incorrect?

    <p>Organic molecules comprise only carbon and oxygen.</p> Signup and view all the answers

    What is the primary function of carbohydrates in organisms?

    <p>Store energy</p> Signup and view all the answers

    Which monomer is associated with proteins?

    <p>Amino acids</p> Signup and view all the answers

    What distinguishes purines from pyrimidines in nucleic acids?

    <p>Purines have two carbon rings, while pyrimidines have one.</p> Signup and view all the answers

    Which of the following organic molecules does NOT consist of repeating subunits?

    <p>Lipids</p> Signup and view all the answers

    What is the key feature of nucleotides in nucleic acids?

    <p>Contain a phosphate group</p> Signup and view all the answers

    Which component is NOT typically found in an amino acid?

    <p>Fatty acid tail</p> Signup and view all the answers

    What type of molecules consists of monomers linked together in long chains?

    <p>Polymers</p> Signup and view all the answers

    Study Notes

    Organic Molecules

    • Organic molecules are chemical compounds that contain both carbon and hydrogen.
    • Methane (CH₄) is a simple example of an organic molecule, demonstrating single covalent bonds.

    Importance of Carbon

    • Carbon atoms have 4 electrons in their outer shell, allowing the formation of 4 covalent bonds.
    • This ability facilitates the creation of complex molecules, including chains and branched structures.

    Essential Elements in Biology

    • Besides carbon, other important elements in biomolecules include oxygen, nitrogen, phosphorus, and hydrogen.

    Types of Organic Molecules in Organisms

    • All living organisms consist mainly of four types of organic molecules:
      • Carbohydrates
      • Proteins
      • Nucleic acids
      • Lipids

    Monomers and Polymers

    • Monomers are the small, single molecular subunits that combine to form polymers.
    • Polymers are formed by repeating patterns or chains of multiple monomers.

    Carbohydrates

    • Composed of simple sugars and primarily contain carbon, hydrogen, and oxygen.
    • Some carbohydrates may have a benzene ring structure.
    • Their primary function is to store energy.

    Proteins

    • Proteins are made up of amino acids, which include:
      • Amino group
      • Alpha (𝛼) carbon
      • Hydrogen atom
      • Carboxyl group
      • Variable side chain, contributing to diverse protein functions.

    Nucleic Acids

    • Nucleic acids consist of nucleotides, including:
      • A 5-carbon pentose sugar (deoxyribose in DNA, ribose in RNA)
      • A phosphate group
      • A nitrogenous base (adenine [A], thymine [T], uracil [U], guanine [G], cytosine [C])
    • Base pairing rules include:
      • A pairs with T (or U in RNA)
      • G pairs with C
    • Adenine and guanine are classified as purines, while thymine (or uracil) and cytosine are pyrimidines.

    Lipids

    • Lipids do not have a specific monomer unit.
    • They are diverse and complex molecules, lacking a defined "building block."

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    Biomolecules (S1L3) PDF

    Description

    Dive into the fascinating world of biomolecules in this quiz for Week 4, Lesson 3 by G. Lanuza. Explore the structure and function of organic molecules that are essential for life, specifically focusing on compounds that contain carbon and hydrogen.

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