BIO 100 Lab Final Review: Core Concepts and Techniques in Introductory Biology

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Virtual laboratories simulate real-life lab experiences, allowing students to practice experimental techniques and data analysis in a digital environment.
They provide a safe, accessible way to learn core laboratory skills and concepts.

Hand Washing: Proper hand washing is essential to prevent contamination and the spread of pathogens.
Personal Protective Equipment (PPE): Includes gloves, goggles, and lab coats; PPE should be worn when handling hazardous materials.
Disposal of Materials: Biological and chemical wastes must be disposed of in designated containers to ensure safety and environmental protection.

Steps: Observation, Question, Hypothesis, Experiment, Data Collection, Analysis, Conclusion, and Reporting.
Hypothesis: A testable statement predicting the outcome of an experiment.
Experimental Design: Involves variables, controls, and replicates to ensure valid results.
Reproducibility: Experiments must be reproducible to validate findings and ensure scientific integrity.

Proteins: Composed of amino acids; function as enzymes, structural components, and signaling molecules.
Carbohydrates: Include sugars and starches; serve as energy sources and structural materials.
Lipids: Nonpolar molecules; function in energy storage, membrane structure, and signaling.
Testing for Biomolecules: Biochemical assays (e.g., Biuret test for proteins, Benedict's test for sugars, Iodine test for starch, Sudan III for lipids) are used to detect these molecules.

Factors Affecting Image Quality: Magnification, resolution, and contrast.
Parts of a Compound Microscope: Ocular lens, objective lenses, stage, condenser, diaphragm, coarse and fine focus knobs, light source.
Wet Mount Slide Preparation: Involves placing a specimen in a drop of liquid on a slide, covered with a coverslip.
Oil Immersion: Used with high-power objectives to increase resolution by reducing light refraction.
Cell Types Under the Microscope: Plant cells (cell wall, chloroplasts), animal cells (no cell wall), protists (diverse structures), bacteria (small, no nucleus).

Diffusion: The passive movement of molecules from an area of higher concentration to lower concentration.
Examples: Oxygen entering cells, perfume scent spreading in air.
Media Effects: Diffusion rate varies with medium (gas > liquid > solid).
Concentration Gradient: The difference in concentration across a space; drives diffusion.
Semi-Permeable Membrane: Allows certain molecules to pass while blocking others; key in osmosis and cell membrane function.

Chloroplast Structure: Contains thylakoids (site of light reactions) and stroma (site of Calvin cycle).
Photosynthetic Pigments: Chlorophyll a, chlorophyll b, carotenoids; absorb light energy.
Photosynthesis Equation:

Factors Affecting Rate: Light intensity, carbon dioxide concentration, temperature.
Location of Reactions: Light reactions in thylakoid membranes; Calvin cycle in stroma.

Cellular Respiration: Aerobic process converting glucose to ATP, CO2, and H2O.
Fermentation: Anaerobic process producing less ATP and byproducts like lactic acid or ethanol.
Reactants and Products: Glucose and oxygen (aerobic); glucose only (anaerobic).
Net ATP: Aerobic respiration yields ~36-38 ATP/glucose; fermentation yields 2 ATP/glucose.
Sugars as Reactants: Glucose, fructose, sucrose, etc., can be metabolized.

Cell Cycle Stages: Interphase (G1, S, G2), Mitosis, Cytokinesis.
Mitosis: Produces two genetically identical diploid somatic cells.
Meiosis: Produces four genetically unique haploid gametes (sex cells).
Somatic vs. Sex Cells: Somatic cells undergo mitosis; sex cells (gametes) are produced by meiosis.
Diploid (2n): Two sets of chromosomes (e.g., human body cells).
Haploid (n): One set of chromosomes (e.g., human gametes).
Identifying Stages: Prophase, metaphase, anaphase, telophase can be distinguished microscopically.

Law of Segregation: Each individual has two alleles for each gene, which segregate during gamete formation.
Law of Independent Assortment: Genes for different traits assort independently during gamete formation.
Dominant vs. Recessive: Dominant alleles mask recessive alleles in heterozygotes.
Genotype and Phenotype: Genotype is the genetic makeup; phenotype is the observable trait.
Genetic Crosses: Monohybrid (one trait), dihybrid (two traits), and X-linked crosses can predict offspring ratios.

Gamete Formation: Occurs via meiosis; results in haploid sperm and eggs.
Chromosomal Inheritance: Traits can be inherited via chromosomes passed from parents to offspring.
Non-Disjunction: Failure of chromosomes to separate properly during meiosis; can result in conditions like Down syndrome (trisomy 21).
Pedigree Analysis: Used to determine inheritance patterns (dominant, recessive, X-linked) in families.
Probability of Inheritance: Calculated using Punnett squares and parental genotypes.

Fossils: Show changes in organisms over time.
Comparative Anatomy: Homologous structures indicate common ancestry.
Molecular Evidence: DNA and protein similarities support evolutionary relationships.

Population: Group of individuals of the same species in a given area.
Genotype & Phenotype: Genotype is the genetic composition; phenotype is the expressed traits.
Allele & Gene Pool: Allele is a gene variant; gene pool is the total alleles in a population.
Antibiotic Resistance: Bacteria evolve resistance through natural selection when exposed to antibiotics.
Natural Selection in Insects: Insect populations can evolve resistance to pesticides.

Ecosystem: Community of living organisms (biotic) and nonliving (abiotic) factors interacting in an environment.
Biotic Factors: Living components (plants, animals, microbes).
Abiotic Factors: Nonliving components (temperature, water, soil, light).
Sampling Methods: Quadrat sampling, transect lines, and mark-recapture are common techniques to estimate population sizes and biodiversity.