Exploring Biomolecules, Cells, and Biotech: From Stem Cells to Bioplastics

Posted on Sep 10, 2024 in Biology

1) Cell Structure and Function

Structure:

1. Plasma Membrane: Surrounds the cell, regulating the passage of substances.
2. Cytoplasm: Jelly-like substance filling the cell, containing organelles.
3. Nucleus: Houses genetic material (DNA), controlling cell activities.
4. Organelles: Specialized structures:
   1. Endoplasmic Reticulum: Involved in protein and lipid metabolism.
   2. Golgi Apparatus: Modifies, sorts, and packages molecules.
   3. Mitochondria: Generates energy through respiration.
   4. Lysosomes: Break down waste materials.
   5. Ribosomes: Sites of protein synthesis.
   6. Centrioles (in animals): Assist in cell division.
   7. Cytoskeleton: Provides structural support and aids in cell movement.

Functions:

1. Respiration: Converts glucose into ATP for energy.
2. Protein Synthesis: Translates genetic information into proteins.
3. Storage and Processing: Synthesizes, modifies, and transports molecules.
4. Cellular Communication: Signals between cells via various molecules.
5. Waste Management: Breaks down and recycles cellular waste.
6. Cell Division: Replicates cells for growth, repair, and reproduction.
7. Movement: Supports cell movement and shape changes.

2) Properties and Applications of Nucleic Acids

1. Polarity: Nucleic acids have distinct 5′ and 3′ ends due to the sugar-phosphate backbone orientation.
2. Double Helix Structure: DNA has two complementary strands winding around each other.
3. Base Pairing: A pairs with T (or U in RNA), and C pairs with G.
4. Hydrogen Bonding: Stabilizes the structure of nucleic acids, especially in DNA’s double helix.
5. Acidic Nature: Due to the presence of phosphate groups.

Functions of Nucleic Acids:

1. Genetic Information Storage: DNA carries genetic instructions.
2. Protein Synthesis: RNA (mRNA, tRNA, rRNA) is involved in protein production.
3. Gene Expression Regulation: Controls when and how genes are turned on or off.
4. Energy Transfer: ATP carries chemical energy within cells.
5. Catalysis: Ribozymes facilitate biochemical reactions.

3) Stem Cells: Classification and Applications

Stem cells can differentiate into various cell types and have the potential to repair damaged cells. Research suggests they could treat conditions like paralysis and Alzheimer’s.

Classification of Stem Cells:

• Totipotent: Can differentiate into all cell types.
• Pluripotent: Can differentiate into any cell type (from early embryos).
• Multipotent: Differentiate into closely related cell types (e.g., hematopoietic stem cells).
• Oligopotent: Differentiate into a few cell types (e.g., adult lymphoid or myeloid cells).
• Unipotent: Produce only their own type but can self-renew (e.g., muscle stem cells).

Applications of Stem Cells:

• Tissue Regeneration: Growing specific tissues or organs for transplants.
• Treatment of Cardiovascular Disease: Developing blood vessels.
• Treatment of Brain Diseases: Replenishing damaged brain cells.
• Blood Disease Treatment: Treating cancers and immunodeficiency diseases.

Sources of Stem Cells:

• Adult stem cells are found in specific tissues.
• Matured cells are specialized for various functions.

4) Biomolecules: Properties and Functions

1. Carbohydrates:

Properties:

• Composed of C, H, and O (1:2:1 ratio).
• Polar and water-soluble due to hydroxyl groups.
• Exist as monosaccharides, disaccharides, and polysaccharides.

Functions:

• Energy Source: Glucose fuels cells.
• Energy Storage: Glycogen (animals) and starch (plants).
• Structural Components: Cellulose (plants), chitin (arthropods).
• Cell Recognition: Glycoproteins and glycolipids.

2. Nucleic Acids:

Properties:

• Made of nucleotides (sugar, phosphate, nitrogenous base).
• DNA is double-stranded, RNA is typically single-stranded.
• Nucleotides are linked by phosphodiester bonds.

Functions:

• Genetic Information Storage: DNA.
• Protein Synthesis: RNA.
• Regulation of Gene Expression: RNA.
• Energy Transfer: ATP.

3. Proteins:

Properties:

• Composed of amino acids linked by peptide bonds.
• Complex structures (primary to quaternary).
• Varied chemical properties based on amino acid side chains.

Functions:

• Enzymatic Activity: Catalyze reactions.
• Structural Support: Collagen.
• Transport and Storage: Hemoglobin, ferritin.
• Cell Communication: Receptors, hormones.
• Defense: Antibodies.
• Movement: Actin, myosin.

4. Lipids:

Properties:

• Mostly C and H, with less O.
• Nonpolar and hydrophobic.
• Include fats, oils, phospholipids, steroids.

Functions:

• Energy Storage: Triglycerides.
• Cell Membrane Structure: Phospholipids.
• Insulation and Protection: Fat.
• Hormone Production: Steroids.

5) Special Biomolecules: Enzymes, Vitamins, and Hormones

1. Enzymes:

Properties:

• Mostly proteins (some RNA ribozymes).
• Catalytic activity.
• Substrate specificity.
• Active site for substrate binding.
• Regulated by inhibitors, activators, and environmental factors.

Functions:

• Catalysis: Speed up reactions.
• Metabolism: Catabolism and anabolism.
• Signal Transduction: Phosphorylation.
• DNA Replication and Repair: DNA polymerases.
• Detoxification: Cytochrome P450.

2. Vitamins:

Properties:

• Organic compounds.
• Essential nutrients (mostly from diet).
• Water-soluble or fat-soluble.

Functions:

• Coenzymes: Assist enzymes (e.g., B vitamins).
• Antioxidants: Vitamin C, E.
• Vision and Bone Health: Vitamin A, D.
• Blood Clotting: Vitamin K.
• Immune Function: Vitamin C.

3. Hormones:

Properties:

• Chemical messengers.
• Peptides/proteins, steroids, or amino acid derivatives.
• Bind to specific receptors.
• Regulated by feedback mechanisms.

Functions:

• Regulation of Metabolism: Insulin, glucagon.
• Growth and Development: Growth hormone, thyroid hormones.
• Reproduction: Sex hormones.
• Stress Response: Cortisol, adrenaline.

6) Differences Between Plant and Animal Cells

• Plant cells have a cell wall, animal cells only have a cell membrane.
• Plant cells have chloroplasts for photosynthesis.
• Plant cells have a larger vacuole.
• Plant cells are more structured due to the cell wall.

7) Importance of Cellulose-Based Water Filters

• Safe and Clean Water: Remove impurities.
• Sustainability: Renewable and biodegradable.
• Affordability: More accessible.
• Versatility: Various filtration systems and sizes.
• Alternative to Synthetic Filters: Environmentally friendly.

8) Cellulose-Based Water Filters: Properties, Advantages, and Construction

Properties:

• High porosity.
• Biodegradability.
• Cost-effective.
• Renewable resource.
• Good mechanical strength.
• Chemical resistance.
• Large surface area.

Advantages:

• Environmentally friendly.
• Cost-effective.
• High porosity.
• Versatile.
• Good mechanical strength.
• Chemical resistance.
• Large surface area.

Construction:

1. Cellulose Material Selection: Paper, cotton, wood fibers.
2. Cellulose Preparation: Cutting, washing, drying.
3. Cellulose Layer Formation: Stacking or compacting.
4. Filter Medium Attachment: Mesh or support structure.
5. Chemical Treatment: Modifying properties.
6. Housing Assembly: Attaching to water source.
7. Filter Testing: Ensuring specifications.

9) PHA as Bioplastic

Polyhydroxyalkanoates (PHAs) are biodegradable and biocompatible polyesters produced by microorganisms. They are a type of bioplastic made from renewable resources like sugar and cornstarch.

Properties of PHA:

• Biodegradability: Breaks down into water and CO2.
• Biocompatibility: Suitable for medical devices.
• Mechanical Properties: Similar to petroleum-based plastics.
• Processing: Can be processed using conventional techniques.

Applications of PHA Bioplastic:

• Packaging: Food containers, cups.
• Medical Devices: Sutures, implants.
• Textiles: Biodegradable textiles and composites.
• Agricultural Mulch Films: Reducing soil erosion.
• Consumer Goods: Toys, phone cases.

10) Properties and Engineering Applications of PLA

Properties:

1. Biodegradability: Breaks down into water and CO2.
2. Biocompatibility: Compatible with living organisms.
3. Renewable: Derived from corn starch or sugar cane.
4. Clear/Transparent: Suitable for packaging.
5. Heat Resistant: Relatively low melting point.

Applications:

1. Automotive Parts: Biodegradable components.
2. Electronic Devices: Biodegradable components.
3. Aerospace: Insulation, cable management.
4. Sporting Goods: Golf tees, fishing lures.
5. Construction: Insulation, soundproofing.

11) Mechanism of Filtration in the Human Kidney

• Blood enters the kidney through renal arteries and flows into glomeruli.
• Pressure in the glomerulus filters plasma and dissolved substances into Bowman’s capsule.
• Filtrate is transferred to renal tubules for further filtering.
• Specialized cells in renal tubules reabsorb essential substances and secrete waste products.
• Filtered fluid (urine) is transported to the bladder for elimination.

12) Use of Whey Protein, Meat Analogs, and Plant-Based Proteins as Food

Whey Protein:

A complete protein derived from milk during cheese-making. Used as a dietary supplement, particularly by athletes and bodybuilders.

Use as Food:

• Sports Nutrition: Muscle building and repair.
• Weight Management: Increased satiety, weight loss.

Meat Analogs:

Plant-based foods that mimic meat’s taste, texture, and appearance. Made from soy protein, wheat protein, pea protein, etc.

Examples:

• Veggie burgers.
• Meatless meatballs.
• Plant-based sausages.

Plant-Based Proteins:

Benefits:

• Sustainable: Environmentally friendly.
• Nutrient-Rich: Fiber, vitamins, minerals.
• Versatile: Protein supplements, smoothies, recipes.
• Hypoallergenic: Better tolerated by some.

13) The Brain as a CPU System

The brain and a CPU both process information and store data. However, the brain can learn, adapt, and handle complex tasks like perception and emotion, which a CPU cannot.

Architecture:

Von Neumann architecture separates CPU and memory, creating a data transfer bottleneck. The brain’s architecture integrates neurons (computing units) and synapses (memory), inspiring Neuromorphic Computing for more efficient processing.

14) The Eye as a Camera System

The human eye and a camera share similarities:

• Diaphragm/Shutter/Pupil: Controls light entering.
• Lens: Focuses light to create an inverted image.
• Image Sensing: Film (camera), retina with rods and cones (eye).

Photoreceptors:

• Rods: Sensitive to light, function in low light (scotopic vision).
• Cones: Detect a wide spectrum of light, responsible for color vision.
• Macula: Responsible for high-resolution color vision.

15) The Heart as a Pump System

The heart is a double pump system:

• Right Side: Receives deoxygenated blood, pumps it to the lungs.
• Left Side: Receives oxygenated blood, pumps it to the body.

Blood Flow:

Right atrium → tricuspid valve → right ventricle → pulmonic valve → pulmonary artery → lungs → pulmonary vein → left atrium → mitral valve → left ventricle → aortic valve → aorta → body → vena cava → right atrium.

16) Pacemakers

Pacemakers are implanted devices that regulate the heartbeat, preventing it from beating too slowly.

Types:

• Single Chamber: Sends impulses to the right ventricle.
• Dual Chamber: Sends impulses to the right ventricle and right atrium.

Function:

• Send electrical signals to correct slow or irregular heartbeats.
• Some have sensors to increase heart rate during exercise.

Components:

• Pulse Generator: Houses battery and circuitry.
• Leads: Wires that connect the pulse generator to the heart.

17) Lungs as a Purification System

The respiratory system delivers oxygen and removes waste gases (CO2).

Functions:

• Warming and moisturizing air.
• Protecting from harmful substances (coughing, sneezing, filtering).
• Supporting the sense of smell.

Architecture:

• Trachea: Main airway.
• Bronchi: Branch into bronchioles.
• Bronchioles: Lead to alveoli.
• Alveoli: Tiny air sacs for gas exchange.

18) & 19) Kidney as a Filtration System

Kidneys remove waste, extra fluid, and acid, maintaining a balance of water, salts, and minerals.

Architecture:

• Two bean-shaped organs.
• Filter blood to produce urine.
• Urine flows through ureters to the bladder.
• Renal parenchyma (cortex and medulla).
• Renal pyramids, renal papilla, minor calyx, major calyx, renal pelvis.

20) Human Blood Substitutes

Human blood substitutes must efficiently carry and deliver oxygen, be safe and compatible, have good storage and transport properties, and be cost-effective.

21) Hemoglobin-Based Oxygen Carriers (HBOCs)

HBOCs are made from isolated hemoglobin.

Advantages:

• Increased oxygen-carrying capacity.
• Universal compatibility.
• Longer shelf life.
• Reduced infection risk.
• Availability in challenging settings.

Disadvantages:

• Short half-life.
• Potential renal toxicity.

22) Perfluorocarbons (PFCs)

PFCs are synthetic compounds with high chemical stability and gas-dissolving abilities.

Advantages and Applications:

• Medical Use: Artificial blood, medical imaging.
• Industrial Applications: Coolants, dielectrics, solvents.

23) Bioprinting Techniques and Materials

Bioprinting creates 3D biological structures.

Techniques:

• Inkjet Bioprinting: Droplet deposition, high speed.
• Extrusion Bioprinting: Continuous flow, complex structures.
• Laser-Assisted Bioprinting (LAB): Laser transfer, high precision.
• Stereolithography (SLA): UV light solidification, intricate structures.

Materials:

• Bioinks: Hydrogels, natural polymers, synthetic polymers.
• Cells: Primary cells, stem cells.
• Support Materials: Scaffolds, growth factors.

Applications:

• Tissue Engineering: Skin, cartilage, bone.
• Organ Transplantation: Kidneys, livers.
• Drug Testing: Controlled environment.

24) Artificial Intelligence for Disease Diagnosis

AI can improve disease diagnosis.

Advantages:

• Image Analysis: Detecting signs in medical images.
• Data Analysis: Identifying patterns in patient data.
• Diagnosis: Evaluating symptoms and test results.
• Personalized Medicine: Creating tailored treatment plans.

Limitations:

• Lack of Understanding: Complex algorithms.
• Bias: Inaccurate diagnoses due to biased data.
• Regulation: Challenging approval processes.
• Cost: Expensive development and implementation.

Self-Healing Bio-Concrete

Self-healing bio-concrete incorporates microorganisms that produce calcium carbonate to fill cracks.

Benefits:

• Increased durability.
• Reduced maintenance costs.
• Improved sustainability.
• Environmentally friendly.

Process Flow Chart:

Mix → Dormancy → Cracking → Water/Oxygen Entry → Activation → Calcium Carbonate Production → Crack Filling → Repair.

Bioremediation and Biomining via Microbial Surface

Bioremediation: Using microorganisms to clean up contaminated environments.

Biomining: Using microorganisms to extract minerals from ore.

Process of Removing Heavy Metals:

Identification → Isolation → Culturing → Suspension Preparation → Application → Adsorption/Sequestration → Separation/Removal.