Recording-2025-09-23T13:28:32.534Z

Energy and ATP

• Nucleotides and Nucleic Acids: Nucleotides are monomers that, when polymerized, form nucleic acids.

• ATP (Adenosine Triphosphate): Our primary energy source, fueling chemical reactions.

  • Cyanide's Lethality: Cyanide is lethal because it halts the production of ATP in mitochondria, leading to death within 2 to 3 minutes.

  • Endergonic Reactions: Reactions that require an energy input are fueled by ATP.

• Energy Storage in Bonds:

  • ATP stores energy in the bonds between its second and third phosphate groups.

  • Molecules with the same charge (like negative phosphates) repel each other, so binding them requires and stores a tremendous amount of potential energy.

  • Energy is held in covalent bonds, which have different energy levels and behaviors.

• ATP Breakdown:

  • ATPases: Enzymes (ending in $-ase$) that break the third phosphate bond of ATP.

  • $ATP \rightarrow ADP + P_i + Energy$

    • $ADP$: Adenosine diphosphate.

    • $P_i$: Free inorganic phosphate molecule.

    • The released phosphate group can be added to another molecule, a process called phosphorylation.

  • Kinases: Enzymes that carry out phosphorylation.

• Metabolism: The sum of all ongoing chemical reactions in the body. A higher metabolic rate means more chemical reactions, consuming more calories.

• Energy Comparison: $ATP$ (adenosine triphosphate) and $GTP$ (guanosine triphosphate) have more energy due to more phosphate groups and covalent bonds (stored potential energy) compared to $ADP$ and $GDP$ (guanosine diphosphate), respectively.

• Cyclic AMP (cAMP): Mentioned as a molecule that will be discussed later in the context of enzymes and metabolic pathways, which are sequential, stepwise actions inside the cell.

Nucleic Acids

• Nucleotides as Monomers: Nucleotides are the monomers that polymerize to form nucleic acids.

• DNA (Deoxyribonucleic Acid):

  • Formed from nucleotides.

  • Comprises the genetic material, carrying the code that creates proteins.

  • DNA strands are tremendously longer and contain more nucleotides than the largest $mRNA$ molecules