Comprehensive Study Guide: ANP College Entrance Topics in Biology, Chemistry, and Physics

Biology

Eukaryotic Cell Structure and Function

The eukaryotic cell is the basic unit of life in animals, plants, fungi, and protists. It is characterized by the presence of membrane-bound organelles, including a nucleus.

• Nucleus: Contains genetic material (DNA) and controls cellular activities.

• Organelles: Include mitochondria (energy production), endoplasmic reticulum (protein and lipid synthesis), Golgi apparatus (modification and transport), lysosomes (digestion), and others.

• Plasma Membrane: Semi-permeable barrier controlling entry and exit of substances.

• Cytoskeleton: Provides structural support and facilitates movement.

• Example: Human liver cells are eukaryotic, containing all major organelles.

Cell Cycle

The cell cycle describes the series of events that cells go through as they grow and divide.

• Phases: G1 (growth), S (DNA synthesis), G2 (preparation for division), M (mitosis or meiosis).

• Mitosis: Division of somatic cells producing two identical daughter cells.

• Meiosis: Division producing gametes (sperm and egg), resulting in four genetically unique cells.

• Genetic Variation: Meiosis introduces variation through crossing over and independent assortment.

• Comparison Table:

Feature	Mitosis	Meiosis
Number of Divisions	1	2
Number of Daughter Cells	2	4
Genetic Identity	Identical	Unique
Function	Growth, repair	Gamete production

Cellular Respiration and Fermentation

Cells obtain energy by breaking down glucose through cellular respiration or fermentation.

• Cellular Respiration: Aerobic process producing ATP, involves glycolysis, Krebs cycle, and electron transport chain.

• Fermentation: Anaerobic process, less efficient, produces lactic acid or ethanol.

• Equation for Aerobic Respiration:

$\mathrm{C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$

Viruses

Viruses are non-cellular infectious agents that require host cells to replicate.

• Structure: Genetic material (DNA or RNA) enclosed in a protein coat (capsid); some have lipid envelopes.

• Replication: Attachment, entry, replication, assembly, and release.

• Diseases: Influenza, HIV/AIDS, COVID-19.

Chromosomal and Molecular Basis of Inheritance

Inheritance is governed by the transmission of chromosomes and genes.

• Sex Chromosomes: X and Y determine biological sex.

• Alterations: Changes in chromosome number (e.g., Down syndrome) or structure (e.g., deletions, duplications).

• DNA Structure: Double helix model proposed by Watson and Crick.

• Chromosome Structure: DNA wrapped around histone proteins forming chromatin.

Genetic Mechanisms

Genetic information flows from DNA to RNA to protein.

• Replication: DNA makes a copy of itself.

• Transcription: DNA is transcribed to mRNA.

• Translation: mRNA is translated into protein.

• Genetic Code: Triplet codons specify amino acids.

• Mutations: Changes in DNA sequence; can be silent, missense, nonsense, or frameshift.

• Gene Expression Regulation: Controlled at transcriptional, post-transcriptional, translational, and post-translational levels.

Tissues and Body Membranes

Tissues are groups of similar cells performing specific functions; membranes line or cover body surfaces.

• Connective Tissue: Supports and binds other tissues (e.g., bone, blood).

• Muscle Tissue: Responsible for movement (skeletal, cardiac, smooth).

• Epithelial Tissue: Covers surfaces and lines cavities.

• Nervous Tissue: Conducts electrical impulses.

• Membranes: Serous (line cavities), mucous (line tracts), synovial (joints), cutaneous (skin).

Senses

The senses allow organisms to perceive and respond to their environment.

• Hearing and Equilibrium: Ear structures detect sound and balance.

• Vision: Eyes detect light and color.

• Taste and Smell: Chemoreceptors in tongue and nose.

• Sensory Receptors: Mechanoreceptors, photoreceptors, chemoreceptors, thermoreceptors, nociceptors.

Nervous System

The nervous system coordinates body activities via electrical and chemical signals.

• Organization: Central nervous system (CNS: brain and spinal cord) and peripheral nervous system (PNS: nerves).

Neurons, Synapses, and Signaling

Neurons are specialized cells transmitting nerve impulses.

• Structure: Cell body, dendrites, axon.

• Synapse: Junction between neurons; neurotransmitters mediate signal transmission.

Hormones and Endocrine System

The endocrine system regulates physiological processes via hormones.

• Endocrine Organs: Pituitary, thyroid, adrenal glands, pancreas, etc.

• Hormone Effects: Multiple, often via feedback mechanisms.

• Feedback Regulation: Negative feedback maintains homeostasis.

Cardiovascular System

The cardiovascular system transports nutrients, gases, and wastes throughout the body.

• Organization: Heart, blood vessels (arteries, veins, capillaries).

• Heart Beat: Controlled by pacemaker cells.

• Blood Pressure: Force exerted by blood on vessel walls.

• Blood Composition: Plasma, red and white blood cells, platelets.

Respiratory System

The respiratory system enables gas exchange between the body and environment.

• Organization: Nasal cavity, pharynx, larynx, trachea, bronchi, lungs.

• Hemoglobin: Protein in red blood cells that binds oxygen.

Digestive System and Nutrition

The digestive system breaks down food and absorbs nutrients.

• Essential Nutrients: Carbohydrates, proteins, fats, vitamins, minerals, water.

• Organization: Mouth, esophagus, stomach, intestines, accessory organs.

• Chemical Digestion: Enzymatic breakdown of macromolecules.

• Dental Adaptation: Teeth specialized for different diets.

Kidneys

The kidneys filter blood, remove waste, and regulate water and electrolyte balance.

• Structure: Cortex, medulla, renal pelvis.

• Nephron: Functional unit; filters blood, reabsorbs needed substances, excretes waste.

• Function: Maintains water balance and blood pressure.

Chemistry

Atoms

Atoms are the basic units of matter, composed of protons, neutrons, and electrons.

• Atomic Theory: All matter is made of atoms.

• Atomic Number: Number of protons in the nucleus.

• Isotopes: Atoms of the same element with different numbers of neutrons.

• Atomic Weight: Weighted average mass of isotopes.

The Periodic Table

The periodic table organizes elements by increasing atomic number and similar properties.

• Groups: Columns with similar chemical properties.

• Electron Configuration: Arrangement of electrons in shells and subshells.

Classification and Balancing of Chemical Reactions

Chemical reactions are classified by the changes that occur and must be balanced to obey the law of conservation of mass.

• Types: Synthesis, decomposition, single replacement, double replacement, combustion.

• Acids and Bases: React to form water and salt (neutralization).

• Redox Reactions: Involve transfer of electrons.

Mole and Mass Relationships

The mole is a counting unit for atoms and molecules; Avogadro's number is $6.022 \times 10^{23}$ particles per mole.

• Gram–Mole Conversions: $\text{Moles} = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}}$

Reaction Rates and Chemical Equilibria

Reaction rates describe how quickly reactions occur; equilibrium is the state where forward and reverse reactions occur at the same rate.

• Endothermic: Absorb heat; Exothermic: Release heat.

• Factors: Temperature, concentration, catalysts, surface area.

• Equilibrium Constant: $K_{eq} = \frac{[\text{Products}]}{[\text{Reactants}]}$

Nuclear Chemistry

Nuclear chemistry studies changes in atomic nuclei, including radioactivity.

• Decay Types: Alpha, beta, gamma.

• Conservation: Nucleon number and charge are conserved.

• Half-life: Time for half the radioactive nuclei to decay.

• Radioactive Decay Law: $N = N_0 e^{-\lambda t}$

Physical Quantities

Physical quantities are measured using the metric system.

• Units: Length (meter), mass (kilogram), volume (liter).

• Significant Figures: Indicate precision of measurements.

Chemical Calculations

Chemical calculations involve the mole concept, formulas, and stoichiometry.

• Stoichiometry: Calculations based on balanced chemical equations.

• Volume and Concentration: $\text{Molarity} = \frac{\text{Moles of solute}}{\text{Volume of solution (L)}}$

Solutions

Solutions are homogeneous mixtures of solute and solvent.

• Concentration Units: Molarity (mol/L), percent, ppm.

• Dilution: $C_1V_1 = C_2V_2$

• Electrolytes: Substances that conduct electricity in solution.

Acids and Bases

Acids donate protons (H+), bases accept protons; pH measures acidity.

• pH Definition: $\mathrm{pH} = -\log_{10}[\mathrm{H}^+]$

• Common Acids: HCl, H2SO4; Bases: NaOH, KOH.

Alcohols

Alcohols are organic compounds with one or more hydroxyl (-OH) groups.

• Naming: Based on parent hydrocarbon (e.g., methanol, ethanol).

• Properties: Soluble in water, can act as weak acids.

• Reactions: Oxidation, dehydration, substitution.

Amino Acids and Proteins

Amino acids are building blocks of proteins; proteins perform diverse biological functions.

• Structure: Central carbon, amino group, carboxyl group, side chain (R group).

• Acid–Base Properties: Zwitterions at physiological pH.

• Protein Properties: Structure (primary, secondary, tertiary, quaternary), function (enzymes, transport, etc.).

Enzymes and Vitamins

Enzymes are biological catalysts; vitamins are essential organic nutrients.

• Enzyme Action: Lower activation energy, increase reaction rate.

• Vitamins: Water-soluble (B, C) and fat-soluble (A, D, E, K).

• Minerals: Inorganic nutrients (e.g., Ca, Fe, Mg).

Carbohydrates

Carbohydrates are energy-providing biomolecules.

• Classification: Monosaccharides, disaccharides, polysaccharides.

• D and L Forms: Stereoisomers based on configuration around asymmetric carbon.

• Glucose Structure: Six-carbon aldose sugar.

• Polysaccharides: Starch, glycogen, cellulose.

Lipids

Lipids are hydrophobic molecules including fats, oils, and steroids.

• Classification: Triglycerides, phospholipids, steroids.

• Fatty Acids: Saturated (no double bonds), unsaturated (one or more double bonds).

• Properties: Energy storage, insulation, cell membrane structure.

Nucleic Acids and Protein Synthesis

Nucleic acids (DNA and RNA) store and transmit genetic information.

• DNA: Double helix, base pairing (A-T, G-C).

• Genes: Segments of DNA coding for proteins.

• Watson–Crick Model: Antiparallel strands, complementary base pairing.

Physics

Dynamics

Dynamics studies the forces and their effects on motion.

• Newton's Laws: 1st (inertia), 2nd ($F = ma$), 3rd (action-reaction).

• Force: Push or pull acting on an object.

• Mass: Measure of inertia.

Fluids and Solids

Fluids and solids have distinct physical properties.

• Density: $\rho = \frac{m}{V}$

• Specific Gravity: Ratio of substance's density to water's density.

• Archimedes' Principle: Buoyant force equals weight of displaced fluid.

Geometrical Optics and Wave Nature of Light

Light exhibits both wave and particle properties.

• Reflection: Bouncing of light from surfaces.

• Refraction: Bending of light as it passes between media.

• Mirrors and Lenses: Form images by reflection/refraction.

• Fiber Optics: Use total internal reflection to transmit light.

Kinematics

Kinematics describes motion without regard to its causes.

• Velocity: Rate of change of position.

• Acceleration: Rate of change of velocity.

• Equations of Motion: $v = u + at$, $s = ut + \frac{1}{2}at^2$

Sounds

Sound is a mechanical wave that propagates through a medium.

• Intensity: Power per unit area.

• Doppler Effect: Change in frequency due to relative motion.

• Sources: Vibrating strings, air columns.

Temperature and Kinetic Theory of Gases

Temperature measures average kinetic energy of particles.

• Kinetic Theory: Explains gas behavior in terms of particle motion.

• Thermal Equilibrium: No net heat flow between objects at same temperature.

• Zero-th Law of Thermodynamics: If A = B and B = C, then A = C in temperature.

Vibration and Waves

Waves transfer energy through oscillations.

• Transverse Waves: Oscillations perpendicular to direction of travel.

• Longitudinal Waves: Oscillations parallel to direction of travel.

• Wave Properties: Reflection, refraction, diffraction.

Work, Power, and Energy

Work is done when a force moves an object; energy is the capacity to do work.

• Work: $W = Fd \cos \theta$

• Kinetic Energy: $KE = \frac{1}{2}mv^2$

• Potential Energy: $PE = mgh$

• Power: $P = \frac{W}{t}$

• Conservative Forces: Path-independent (e.g., gravity); Non-conservative: Path-dependent (e.g., friction).

• Work-Energy Principle: Net work done equals change in kinetic energy.