Comprehensive Study Guide: Foundations of Biology (Chapters 1–19)

Ch. 1: Introduction: Themes in the Study of Life

Classification of Life

• Three Domains: All living organisms are classified into Bacteria, Archaea, and Eukarya.

• Cell Types: Prokaryotic cells (Bacteria and Archaea) lack membrane-bound organelles; Eukaryotic cells (Eukarya) contain membrane-bound organelles.

• Four Kingdoms of Eukarya: Plantae, Animalia, Fungi, and Protists.

Properties and Processes of Life

• Order, evolutionary adaptation, response to the environment, regulation, energy processing, growth and development, and reproduction are key properties of life.

Themes of Biology

• Emergent properties, structure and function, information flow, energy transfer, and interactions within systems.

Biological Organization

• Hierarchy: biosphere → ecosystems → communities → populations → organisms → organs → tissues → cells → organelles → molecules.

Ch. 2: The Chemical Context of Life

Subatomic Particles

• Protons (positive), neutrons (neutral), and electrons (negative) make up atoms.

Types of Chemical Bonds

• Covalent Bonds: Atoms share electrons.

• Ionic Bonds: Transfer of electrons from one atom to another, forming ions.

• Noncovalent Bonds:

  • Hydrogen Bonds: Weak attractions between a hydrogen atom and an electronegative atom (e.g., O or N).

  • Van der Waals Interactions: Weak, transient interactions due to fluctuating charges.

Ch. 3: Water and the Fitness of the Environment

Structure and Properties of Water

• Hydrogen Bonding: Each water molecule can form up to four hydrogen bonds, leading to unique properties.

Emergent Properties of Water

• Cohesion, adhesion, high specific heat, high heat of vaporization, and expansion upon freezing.

pH, Acids, Bases, and Buffers

• pH Scale: Measures hydrogen ion concentration; $pH = -\log_{10}[H^+]$

• Acids: Increase $[H^+]$; Bases: Decrease $[H^+]$.

• Buffers: Substances that minimize changes in pH.

Ch. 4: Carbon and the Molecular Diversity of Life

Bonding and Functional Groups

• Carbon: Forms four covalent bonds, allowing for diverse organic molecules.

• Hydrocarbons: Nonpolar, hydrophobic molecules consisting only of C and H.

• Functional Groups: Seven common groups include hydroxyl, carbonyl, carboxyl, amino, sulfhydryl, phosphate, and methyl.

Ch. 5: The Structure and Function of Large Biological Molecules

Macromolecules and Their Synthesis

• Dehydration Reaction: Joins monomers to form polymers by removing water.

• Hydrolysis: Breaks polymers into monomers by adding water.

Major Biological Macromolecules

• Carbohydrates: Sugars and polymers (monosaccharides, disaccharides, polysaccharides).

• Lipids: Fats, phospholipids, steroids; hydrophobic.

• Proteins: Composed of amino acids; four levels of structure (primary, secondary, tertiary, quaternary).

• Nucleic Acids: DNA and RNA; store and transmit genetic information.

Ch. 6: A Tour of the Cell

Cellular Components and Organelles

• Lysosome: Digests macromolecules and recycles cell components.

• Endoplasmic Reticulum (ER): Rough ER synthesizes proteins; smooth ER synthesizes lipids and detoxifies.

• Mitochondria: Site of cellular respiration and ATP production.

• Chloroplast: Site of photosynthesis in plants and algae.

• Golgi Apparatus: Modifies, sorts, and packages proteins and lipids.

• Cytoskeleton (Microtubules): Maintains cell shape, enables movement.

• Plasma Membrane: Selectively permeable barrier.

• Ribosome: Protein synthesis.

• Nucleus: Contains genetic material (DNA).

Ch. 7: Membrane Structure and Function

Cell Membrane Structure

• Phospholipids and Proteins: Main components of the cell membrane.

• Fluid Mosaic Model: Describes the dynamic arrangement of lipids and proteins.

• Integral vs Peripheral Proteins: Integral proteins span the membrane; peripheral proteins are attached to the surface.

Membrane Transport

• Permeability: Lipid bilayer is selectively permeable.

• Osmosis: Diffusion of water across a membrane.

• Water Balance: Hypotonic (water enters cell), isotonic (no net movement), hypertonic (water leaves cell).

• Passive Transport: Diffusion without energy input.

• Active Transport: Movement against gradient, requires energy (ATP).

Ch. 8: Introduction to Metabolism

Thermodynamics and Enzymes

• First Law: Energy cannot be created or destroyed.

• Second Law: Every energy transfer increases entropy.

• Enzymes: Biological catalysts that lower activation energy.

• Local Conditions: Temperature and pH affect enzyme activity.

• Induced Fit Theory: Enzyme changes shape to fit substrate.

• Inhibitors: Competitive (bind active site) vs noncompetitive (bind elsewhere).

Ch. 9: Cellular Respiration

Stages of Cellular Respiration

• Glycolysis: Glucose → pyruvate; occurs in cytosol.

• Pyruvate Oxidation: Pyruvate → Acetyl-CoA.

• Citric Acid Cycle: Completes breakdown of glucose.

• Oxidative Phosphorylation: Electron transport chain and chemiosmosis produce most ATP.

ATP Production

• Substrate-Level Phosphorylation: Direct transfer of phosphate to ADP.

• Oxidative Phosphorylation: ATP synthesis powered by redox reactions.

Fermentation

• Allows ATP production without oxygen; produces lactate or ethanol.

Ch. 12: The Cell Cycle - Mitosis

Stages of Mitosis

• Prophase, Prometaphase, Metaphase, Anaphase, Telophase, Cytokinesis: Sequential steps for equal division of chromosomes.

Binary Fission

• Cell division in prokaryotes; simpler than mitosis.

Cell Cycle Control

• Checkpoints regulate progression through the cell cycle.

Ch. 13: Meiosis

Chromosomes and Cell Types

• Autosomes: Chromosomes 1–22 in humans.

• Sex Chromosomes: X and Y.

• Diploid (2n): Somatic cells; Haploid (n): Gametes.

• Homologous Chromosomes, Chromatids, Chromatin: Key terms in chromosome structure.

Stages of Meiosis

• Two divisions: Meiosis I and II; reduces chromosome number by half.

• Synapsis and Crossing Over: Homologous chromosomes exchange genetic material, increasing diversity.

Ch. 14 & 15: Genetics

Basic Principles

• Dominant vs Recessive: Dominant alleles mask recessive ones.

• Homozygous: Two identical alleles; Heterozygous: Two different alleles.

• Genetic Crosses: Use Punnett squares to predict offspring genotypes and phenotypes.

Ch. 16: Molecular Basis of Inheritance

DNA Replication

• Semi-Conservative: Each new DNA has one old and one new strand.

• Complementary Base Pairing: A pairs with T, C with G.

• Directionality: DNA synthesized 5' to 3'.

Enzymes in DNA Replication

• Primase: Synthesizes RNA primer.

• DNA Ligase: Joins Okazaki fragments.

• DNA Polymerase III: Main enzyme for DNA synthesis.

• Topoisomerase: Relieves strain ahead of replication fork.

• Helicase: Unwinds DNA double helix.

Ch. 17: From Gene to Protein

Transcription and Translation

• Transcription: DNA → mRNA (involves RNA polymerase).

• Translation: mRNA → Protein (involves tRNA, ribosomes, codons, anticodons).

Mutations

• Silent: No effect on protein sequence.

• Missense: Changes one amino acid.

• Nonsense: Introduces a stop codon.

• Frameshift: Alters reading frame (insertions/deletions).

Ch. 19: Viruses and COVID-19

Viral Structure and Multiplication

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

• Multiplication: Viruses infect host cells to replicate.

• Lytic Cycle: Virus replicates and lyses host cell.

• Lysogenic Cycle: Viral DNA integrates into host genome and replicates with it.

COVID-19

• Caused by SARS-CoV-2, an RNA virus; spreads via respiratory droplets.

Additional Info

• Cystic Fibrosis Case Study: Focus on inheritance (autosomal recessive), gene mutations (CFTR gene), resulting mutant proteins, and drug design targeting defective proteins.