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Carbon and Molecular Diversity of Life - General Biology

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Termini in questo insieme (20)

  • Why can carbon form diverse molecules?
    Carbon has 4 valence electrons and forms four covalent bonds, allowing it to bond with up to four other atoms in a tetrahedral shape.
  • What is the typical geometry of atoms bonded to carbon?
    Atoms bonded to carbon are arranged in a tetrahedral geometry with bond angles of approximately 109.5°.
  • How do double bonds affect carbon molecule shape?
    Double bonds between carbon atoms create planar geometry, restricting rotation and locking atoms in the same plane.
  • What are hydrocarbons?
    Hydrocarbons are organic molecules made up of only carbon and hydrogen, often hydrophobic due to nonpolar C–H bonds.
  • What is the significance of hydrocarbons in biology?
    Hydrocarbons form the tails of fats and store large amounts of energy through combustion reactions.
  • Define isomers in organic chemistry.
    Isomers are compounds with the same molecular formula but different structures, leading to different chemical properties.
  • What are structural isomers?
    Structural isomers differ in the covalent arrangement of atoms and may vary in the location of double bonds.
  • What are cis-trans (geometric) isomers?
    Cis-trans isomers have the same covalent bonds but differ in spatial arrangement around a carbon–carbon double bond.
  • What are enantiomers?
    Enantiomers are mirror-image isomers that occur when a carbon is bonded to four different groups, creating non-superimposable forms.
  • Why are enantiomers biologically important?
    Typically, only one enantiomer is biologically active; the other may be inactive or have different effects.
  • What determines the unique properties of an organic molecule?
    The arrangement of its carbon skeleton and the chemical groups attached to it determine its unique properties.
  • What roles do chemical groups play in organic molecules?
    Chemical groups affect molecule shape, function, reactivity, and can replace hydrogen atoms in hydrocarbons.
  • Name the seven key functional groups in biological molecules.
    Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl groups.
  • Which functional group is hydrophobic and non-reactive?
    The methyl group is non-reactive and hydrophobic, often serving as a recognizable tag on molecules.
  • What is ATP and its role in cells?
    Adenosine triphosphate (ATP) is an organic phosphate that serves as the primary energy transfer molecule in cells.
  • How does ATP release energy?
    ATP releases energy when one phosphate group is removed by reaction with water, converting it to ADP.
  • What is the valence and bonding capacity of carbon?
    Carbon has a valence of 4, meaning it can form four covalent bonds to complete its valence shell.
  • How do carbon skeletons vary?
    Carbon skeletons vary in length, branching, presence of double bonds, and may form rings.
  • What is the difference between acetone and propanal?
    Acetone is a ketone with a carbonyl group within the carbon skeleton; propanal is an aldehyde with the carbonyl group at the end.
  • How do testosterone and estradiol differ despite similar carbon skeletons?
    They differ in the chemical groups attached to their four fused carbon rings, resulting in different shapes and biological effects.