Comprehensive Biology Honors Final Exam Study Guide

Chapter 1: Biology – The Study of Scientific Life

1.1 What is Life?

• Characteristics of Life: All living things share certain properties, including organization, metabolism, homeostasis, growth, reproduction, response to stimuli, and adaptation. Example: Plants grow toward light (response to stimulus).

• Homeostasis: The maintenance of a stable internal environment. Example: Human body temperature regulation.

• Unicellular vs. Multicellular: Unicellular organisms consist of one cell (e.g., Amoeba), while multicellular organisms have many cells (e.g., humans).

• Autotrophs vs. Heterotrophs: Autotrophs produce their own food (e.g., plants), while heterotrophs consume other organisms (e.g., animals).

1.4–1.5 The Process of Science

• Scientific Method: Involves making observations, forming hypotheses, conducting experiments, and drawing conclusions.

• CER (Claim, Evidence, Reasoning): A framework for scientific explanation.

• Controlled Experiment: Includes a control group and variables (independent/manipulated and dependent/responding).

• Hypothesis: A testable statement; can be null (no effect) or alternative (effect expected).

• Data Interpretation: Ability to analyze graphs and scientific data is essential.

Chapter 2: The Chemical Basis of Life

2.8–2.14 Properties of Water

• Cohesion: Attraction between water molecules (e.g., water droplets).

• Adhesion: Attraction between water and other substances (e.g., water climbing up plant vessels).

• Surface Tension: The 'skin' on water's surface due to cohesion.

• Capillary Action: Movement of water within narrow spaces, important for plant transpiration.

• Polarity: Water is a polar molecule, allowing it to dissolve many substances.

Chapter 3: The Molecules of Cells

3.1, 3.3–3.8, 3.12–3.14 Biomolecules

• Organic vs. Inorganic Compounds: Organic compounds contain carbon and hydrogen; inorganic do not (e.g., CO2 is inorganic).

• Major Biomolecules:

  • Carbohydrates: Energy source; monomer = monosaccharide; elements = CHO.

  • Lipids: Energy storage, membranes; monomer = fatty acids/glycerol; elements = CHO.

  • Proteins: Structure, enzymes; monomer = amino acid; elements = CHON (sometimes S).

  • Nucleic Acids: Genetic information; monomer = nucleotide; elements = CHONP.

• Protein Folding: Structure determines function; denaturation disrupts function.

• Monomer vs. Polymer: Monomers are building blocks; polymers are chains of monomers.

• Hydrolysis & Dehydration Synthesis: Hydrolysis breaks polymers; dehydration synthesis forms them.

• Energy Storage: Chemical bonds in organic molecules store energy.

Chapter 4: A Tour of the Cell & Chapter 5: The Working Cell

4.2–4.18 Cell Structure

• Cell Walls: Found in plants, fungi, bacteria; not in animal cells.

• Cell Membranes: Present in all cells; regulate entry/exit of substances.

• Eukaryotes vs. Prokaryotes: Eukaryotes have a nucleus and organelles (e.g., plants, animals); prokaryotes do not (e.g., bacteria).

• Organelles: Structures with specific functions (e.g., mitochondria = energy, chloroplasts = photosynthesis).

5.1 Plasma Membrane

• Components: Phospholipid bilayer, proteins, cholesterol, carbohydrates.

• Membrane Proteins: Transport, signaling, cell recognition.

5.3–5.9 Membrane Transport

• Diffusion: Movement from high to low concentration.

• Osmosis: Diffusion of water across a selectively permeable membrane.

• Concentration Gradient: Difference in concentration; drives diffusion.

• Solution Types:

  • Hypertonic: Higher solute outside; cell loses water.

  • Hypotonic: Lower solute outside; cell gains water.

  • Isotonic: Equal solute; no net water movement.

• Active vs. Passive Transport: Active requires energy (e.g., sodium-potassium pump); passive does not (e.g., diffusion, osmosis).

• Facilitated Diffusion: Passive transport via protein channels (e.g., glucose transport).

5.12–5.13 ATP & Enzymes

• ATP: Main energy currency of the cell.

• Enzymes: Biological catalysts; lower activation energy; specific to substrates; affected by temperature and pH.

• Denaturation: Loss of enzyme structure and function due to extreme conditions.

Chapter 6: How Cells Harvest Chemical Energy

6.1–6.8, 6.11 Cellular Respiration

• Stages: Glycolysis (anaerobic), Krebs Cycle (aerobic), Electron Transport Chain (aerobic).

• Reactants & Products: Glucose + O2 → CO2 + H2O + ATP

• Final Electron Acceptor: Oxygen in aerobic respiration.

• ATP Yield: Aerobic respiration produces more ATP than anaerobic.

• Equations:

  • Cellular Respiration: $\mathrm{C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$

  • Photosynthesis: $\mathrm{6CO_2 + 6H_2O + light \ energy \rightarrow C_6H_{12}O_6 + 6O_2}$

Chapter 7: Photosynthesis

7.2–7.5 Photosynthesis Overview

• Source of Energy: Sunlight.

• Energy Transformations: Light energy → chemical energy (glucose).

• Light Reactions: Occur in thylakoid membranes; produce ATP and NADPH.

• Calvin Cycle: Occurs in stroma; uses ATP/NADPH to fix CO2 into glucose.

• Final Electron Acceptor (Light Reaction): NADP+.

Chapter 8: The Cellular Basis of Reproduction and Inheritance

8.1, 8.3–8.10 Cell Division & Mitosis

• Cell Division: Process by which cells reproduce.

• Parent/Daughter Cells: Parent cell divides to form genetically identical daughter cells (mitosis).

• Asexual vs. Sexual Reproduction: Asexual = one parent, identical offspring; sexual = two parents, genetic variation.

• Somatic Cells vs. Gametes: Somatic = body cells (diploid); gametes = sex cells (haploid).

• Cell Cycle: Interphase (G1, S, G2), Mitosis, Cytokinesis.

• Mitosis: Prophase, Metaphase, Anaphase, Telophase; results in two identical cells.

• Chromosome Numbers: Human somatic cells = 46; gametes = 23.

8.12–8.20 Meiosis

• Function: Produces gametes; reduces chromosome number by half.

• Genetic Variation: Crossing over, independent assortment.

• Terms: Haploid (n), diploid (2n), homologous pairs, zygote, autosomes, sex chromosomes.

• Karyotype: Visual representation of chromosomes; used to detect abnormalities (e.g., nondisjunction).

Chapter 9: Patterns of Inheritance

9.2–9.5 Mendelian Genetics

• Mendel: Father of genetics; studied pea plants.

• Key Terms: Trait, gene, homozygous, heterozygous, dominant, recessive, Law of Segregation.

• P, F1, F2 Generations: Parental, first filial, second filial.

• Punnett Squares: Used to predict genotype and phenotype ratios.

• Monohybrid vs. Dihybrid Cross: One trait vs. two traits.

• Common Ratios: 3:1 (monohybrid), 9:3:3:1 (dihybrid).

9.8 Pedigrees & Sex-Linked Traits

• Pedigree Analysis: Traces inheritance patterns; autosomal dominant/recessive, sex-linked traits.

• Sex-Linked Inheritance: Traits on X or Y chromosome; often more common in males.

9.11–9.14 Non-Mendelian Genetics

• Incomplete Dominance: Heterozygote shows intermediate phenotype (e.g., pink flowers).

• Codominance: Both alleles expressed (e.g., AB blood type).

• Multiple Alleles: More than two alleles for a gene (e.g., blood types).

• Blood Types: A, B, AB, O; Rh factor.

• Karyotype & Nondisjunction: Chromosome number abnormalities (e.g., Down syndrome).

9.20–9.21 Sex-Linked Traits

• Punnett Squares: Used for sex-linked trait inheritance.

Chapter 10: Molecular Biology of the Gene

10.2–10.3 DNA & RNA Structure

• DNA vs. RNA: DNA = double-stranded, deoxyribose; RNA = single-stranded, ribose.

• Genetic Code: Sequence of DNA bases determines traits.

• Nucleotide Structure: Phosphate, sugar, nitrogenous base.

• Bonds: Covalent bonds (backbone), hydrogen bonds (between bases).

• Base Pairing: DNA: A–T, C–G; RNA: A–U, C–G (Chargaff’s rule).

10.4–10.5 DNA Replication

• Purpose: Copy DNA before cell division.

• Leading vs. Lagging Strand: Continuous vs. discontinuous synthesis.

10.6–10.13 Protein Synthesis

• Central Dogma: DNA → RNA → Protein.

• Transcription: DNA to mRNA (in nucleus).

• Translation: mRNA to protein (at ribosome).

• Codons & Anticodons: Codons (mRNA), anticodons (tRNA); 3 bases = 1 amino acid.

• Mutations: Changes in DNA sequence; can affect protein function.

10.16 Locations & Functions

• Replication: Nucleus.

• Transcription: Nucleus.

• Translation: Cytoplasm/ribosome.

• Organelles: Ribosomes, nucleus.

Chapter 12: DNA Technology and Genomics

• Restriction Enzymes: Cut DNA at specific sequences.

• Gel Electrophoresis: Separates DNA fragments by size; used to compare evolutionary relationships.

Chapter 13: How Populations Evolve

13.1–13.5 Adaptation & Evidence

• Adaptations: Traits that improve survival/reproduction.

• Evidence of Evolution: Vestigial structures, homologous structures, biochemical similarities.

13.6–13.8 Evolution & Natural Selection

• Evolution: Change in allele frequencies over time.

• Natural Selection: Differential survival/reproduction; requires variation, inheritance, selection, time.

• Genetic Variation: Mutation, gene shuffling.

• Key Terms: Mutation, gene pool, fitness, allele frequency.

13.9–13.11 Hardy-Weinberg Principle

• Conditions: Large population, random mating, no mutation, no migration, no selection.

• Equation: $p^2 + 2pq + q^2 = 1$ and $p + q = 1$

13.12–13.14 Types of Selection

• Directional Selection: Favors one extreme.

• Stabilizing Selection: Favors intermediate.

• Disruptive Selection: Favors both extremes.

Chapter 15: Tracing Evolutionary History

• Derived Characters: Traits shared by a group but not found in ancestors.

• Kingdom Characteristics: Cell type, nutrition, multicellularity.

• Cladograms: Diagrams showing evolutionary relationships.

• Common Ancestry: Determined by morphology, genetics, molecular data.

Chapters 20–23, 28–29: Animals & Body Systems

Chapter 20: Animal Structure & Function

• Feedback Loops: Negative feedback maintains homeostasis; positive feedback amplifies change.

Chapter 21: Nutrition & Digestion

• Alimentary Canal: Mouth → esophagus → stomach → small intestine → large intestine → anus.

• Chemical vs. Mechanical Digestion: Mechanical (teeth, stomach churning); chemical (enzymes, begins in mouth for carbs).

• Enzymes: Amylase (carbs), protease (proteins), lipase (fats).

• Peristalsis: Muscle contractions moving food.

Chapter 22: Gas Exchange

• Respiratory Pathway: Nose → pharynx → larynx → trachea → bronchi → bronchioles → alveoli.

• Negative Pressure Breathing: Diaphragm contracts, air drawn in.

• Feedback Loops: CO2 levels regulate breathing via nervous/circulatory systems.

Chapter 23: Circulation

• Blood Flow: Heart → lungs (pulmonary) → heart → body (systemic).

• Arteries vs. Veins: Arteries carry blood away from heart; veins toward heart.

• Blood Pressure: Normal ~120/80 mmHg; high/low readings indicate health issues.

• Blood Components: Red cells (O2), white cells (immunity), platelets (clotting), plasma (fluid).

Chapter 28: Nervous Systems

• Neuron Structure: Dendrite, cell body, axon, synapse.

• Impulse Pathway: Dendrite → cell body → axon → synapse.

• Action Potential: Electrical signal; neurotransmitters transmit across synapse.

• Brain Regions: Cerebrum, midbrain, hindbrain, cerebellum.

Chapters 31–33: Plants

Chapter 31: Plant Structure

• Key Characteristics: Multicellular, autotrophic, cell walls (cellulose).

• Structures: Roots, shoots, root hairs, leaves, flowers.

• Tissues: Vascular (xylem, phloem), dermal (guard cells, stomata), cuticle (waterproofing).

Chapter 32: Plant Nutrition & Transport

• Transpiration: Water loss via leaves; driven by cohesion, adhesion, capillary action.

• Stomata: Open/close to regulate gas exchange and water loss.

Chapter 33: Control Systems in Plants

• Plant Hormones: Auxin controls phototropism (growth toward light).

• Tropisms: Phototropism (light), gravitropism (gravity), thigmotropism (touch).

• Darwin’s Experiment: Showed tips of shoots sense light.

Chapters 34 & 37: Ecology

Chapter 34: The Biosphere

• Ecology: Study of interactions among organisms and their environment.

• Biotic vs. Abiotic Factors: Living vs. nonliving components.

• Levels of Organization: Population, community, ecosystem, biosphere.

• Ultimate Energy Source: Sun.

• Law of Conservation: Energy and matter are neither created nor destroyed.

Chapter 37: Communities & Ecosystems

• Symbiotic Relationships: Mutualism (+/+), predation (+/–), parasitism (+/–), herbivory (+/–), commensalism (+/0).

• Trophic Levels: Producers, consumers (primary, secondary, tertiary, quaternary), decomposers.

• Biomass: Total mass of living matter at each trophic level.

• 10% Rule: Only ~10% of energy is transferred to next level; 90% lost as heat.

• Food Chains vs. Food Webs: Chains are linear; webs are interconnected.

• Limiting Factors: Density-dependent (e.g., disease), density-independent (e.g., weather).

• Carrying Capacity: Maximum population an environment can support.

• Predator-Prey Cycles: Populations fluctuate in response to each other.

• Competition: Intraspecific (within species), interspecific (between species).

• Keystone Species: Species with a disproportionate effect on ecosystem.

• Trophic Cascades: Changes at one trophic level affect others (e.g., Yellowstone wolves).

Biomolecule	Elements	Monomer	Function
Carbohydrate	C, H, O	Monosaccharide	Energy, structure (cell wall)
Lipid	C, H, O	Fatty acid, glycerol	Energy storage, membranes
Protein	C, H, O, N, (S)	Amino acid	Structure, enzymes
Nucleic Acid	C, H, O, N, P	Nucleotide	Genetic information

Transport Type	Energy Required?	Example
Passive (Diffusion)	No	O2 into cell
Passive (Facilitated Diffusion)	No	Glucose via channel
Active Transport	Yes (ATP)	Na+/K+ pump

Selection Type	Description	Example
Directional	Favors one extreme	Antibiotic resistance
Stabilizing	Favors intermediate	Human birth weight
Disruptive	Favors both extremes	Beak size in finches

Additional info: This guide is a synthesis of the main concepts from a typical college-level introductory biology course, organized by chapter and topic. For deeper understanding, refer to your textbook, class notes, and recommended resources.