Untitled Notes

Components of ATP:
  - Three main components:
    - Adenine: A nitrogenous base.
    - Ribose: A five-carbon sugar.
    - Three Phosphate Groups: Linked by high-energy bonds.
Energy Location in ATP:
- Most of the energy is found in the bonds between the second and third phosphate groups.
Difference between ATP and ADP:
- ATP (Adenosine Triphosphate) consists of three phosphate groups, whereas ADP (Adenosine Diphosphate) contains only two.
- The release of energy occurs when ATP is converted to ADP through the hydrolysis of the terminal phosphate bond.
Phosphorylation:
- The process of adding a phosphate group to a molecule. It is crucial for the regeneration of ATP from ADP, allowing the energy stored in ATP to be used in cellular processes.
Energy Source to Convert ADP to ATP:
- The energy needed to convert ADP back into ATP primarily comes from cellular respiration and photosynthesis.

Overall Chemical Equation:
  - The equation for photosynthesis:
    6CO_2 + 6H_2O + light
ightarrow C_6H_{12}O_6 + 6O_2
  - The main purpose is to convert light energy into chemical energy stored in glucose.

Initial Reaction to Light:
- When light hits the thylakoid membrane, it excites electrons in chlorophyll, leading to their transfer through the electron transport chain.
Source of Oxygen:
- Oxygen is produced from the splitting of water molecules (photolysis).
Products of Light Dependent Reaction:
  - The products include:
    - ATP
    - NADPH (used in the Calvin Cycle).
Substance NOT Produced:
- Glucose is not produced during this reaction; it is generated in the light-independent reactions (Calvin Cycle).

Source of Carbon:
- Carbon dioxide (CO_2) from the atmosphere is the source of carbon needed to make carbohydrates.
Molecules Needed from Light Dependent Reaction:
- The two essential molecules needed are ATP and NADPH.
End Product of Calvin Cycle:
- The primary product is G3P (glyceraldehyde-3-phosphate), which can be used to synthesize glucose.

Organisms Using Chemosynthesis:
- Primarily used by certain bacteria and archaea, particularly those in extreme environments.
Main Purpose and Energy Source:
- The main purpose is to produce organic compounds using energy derived from inorganic chemical reactions, typically sulfur or ammonia reactions.
Comparison between Photosynthesis and Chemosynthesis:
  - Photosynthesis:
    - Organisms: Green plants, algae, and some bacteria.
    - Energy Source: Light energy.
    - Molecules Used: Carbon dioxide and water.
    - Molecules Produced: Glucose and oxygen.
  - Chemosynthesis:
    - Organisms: Certain bacteria and archaea in hostile environments.
    - Energy Source: Chemical energy from inorganic compounds.
    - Molecules Used: Inorganic materials (e.g., H_{2}S).
    - Molecules Produced: Organic compounds (e.g., glucose).

Oxidation and Reduction:
- Oxidation: The loss of electrons (e.g., glucose oxidation in cellular respiration).
- Reduction: The gain of electrons (e.g., NAD^+ is reduced to NADH).
ATP Production:
- Aerobic cellular respiration can produce up to 36-38 ATP molecules from one glucose molecule.
Energy Storage in Respiration:
- Energy is stored in the form of electron carriers such as NADH and FADH_2 (referred to metaphorically as "bus" and "taxi" for transporting electrons).
Aerobic vs. Anaerobic Respiration:
- Aerobic Respiration: Occurs in the presence of oxygen; produces CO_2, H_2O, and 36-38 ATP.
- Anaerobic Respiration: Occurs without oxygen; produces lactic acid or ethanol, and significantly less ATP (2 ATP).
Consequences of Oxygen Deprivation:
- Without oxygen, cells switch to anaerobic respiration, leading to lactic acid or fermentation, which is less efficient in ATP production.
Four Steps of Cellular Respiration:
  1. Glycolysis: Breakdown of glucose into pyruvate (produces 2 ATP).
  2. Pyruvate Oxidation: Conversion of pyruvate to Acetyl CoA.
  3. Krebs Cycle: Processes Acetyl CoA, produces NADH and FADH_2.
  4. Electron Transport Chain: Electron carriers donate electrons to produce the bulk of ATP through oxidative phosphorylation.

Diagram Labeling: (to be drawn by the student)
Processes:
- Chloroplasts: Photosynthesis.
- Mitochondria: Cellular respiration.
Locations:
- Chloroplasts: Thylakoid membrane (light-dependent phase), stroma (Calvin Cycle).
- Mitochondria: Inner mitochondrial membrane (electron transport chain), matrix (Krebs Cycle).
Cell Types:
- Chloroplasts: Found in plant cells and some protists.
- Mitochondria: Present in nearly all eukaryotic cells.
Similarities:
- Both organelles are involved in energy conversion processes, contain their own DNA, and have double membranes.
Differences:
- Chloroplasts carry out photosynthesis, generating oxygen and glucose, while mitochondria metabolize glucose, consuming oxygen and generating CO_2.

Photosynthesis and Cellular Respiration:
- These processes are complementary because the products of photosynthesis (glucose and oxygen) serve as reactants for cellular respiration, and vice versa (cellular respiration produces CO_2 and H_2O, which are used in photosynthesis).

Prokaryotic organisms.
Unicellular.
Some are autotrophic (photosynthetic or chemosynthetic) and others are heterotrophic.
Lack membrane-bound organelles.

Description of Four Groups:
   - Thermophiles: Thrive in high-temperature environments.
   - Halophiles: Adapted to highly saline conditions.
   - Acidophiles: Prefer acidic environments.
   - Alkaliphiles: Prefer alkaline (basic) environments.
TWO Adaptations for Survival:
- Specialized enzymes that function at extreme temperatures or pH levels.
- Membrane adaptations that maintain integrity and function under stressful conditions.
Superbugs:
- Bacteria that have developed resistance to antibiotics.
- Farmers often add antibiotics to livestock feed to prevent disease and promote growth but this may lead to the development of antibiotic-resistant bacteria.