General Biology Lab Study Guide: Key Concepts and Applications

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DNA extraction is a fundamental technique in molecular biology, allowing scientists to isolate genetic material from cells for further analysis.

Strawberry Mashing: Mashing breaks open cell walls and membranes, releasing cellular contents including DNA.
Soap Buffer: Soap helps dissolve cell membranes and nuclear envelopes, freeing DNA into solution.
Addition of Ethanol: Ethanol precipitates DNA, making it visible and easier to collect.
Example: DNA extraction from strawberries is commonly used in teaching labs due to their high DNA content.

Organisms respond to environmental stimuli through movement. These responses are classified as kinesis or taxis.

Kinesis: A non-directional movement in response to a stimulus (e.g., increased movement in dry areas).
Taxis: A directional movement toward or away from a stimulus (e.g., phototaxis toward light).
Types of Orientation Behaviors:
- Geotaxis: Movement in response to gravity.
- Chemotaxis: Movement in response to chemicals.
- Phototaxis: Movement in response to light.
- Thigmotaxis: Movement in response to touch.
Planaria Behavior: Planaria exhibit negative phototaxis (move away from light).
Anatomical Features: Planaria have a simple nervous system and can regenerate lost body parts.
Phylum: Planaria belong to the phylum Platyhelminthes.

Plants are classified into major groups based on their reproductive structures and tissue types.

Major Groups: Bryophytes, Ferns, Gymnosperms, Angiosperms
Vascular Tissue: Ferns, gymnosperms, and angiosperms have vascular tissue; bryophytes do not.
Spore Production: Bryophytes and ferns produce spores; gymnosperms and angiosperms produce seeds.
Flowering vs. Cone-Bearing: Angiosperms are flowering plants; gymnosperms are cone-bearing.
Flower Parts: The main parts of a flower include the stamen (anther, filament), pistil (stigma, style, ovary), petals, and sepals.
Pollen Storage: Pollen is stored in the anther; ovules are produced in the ovary.

Colorful Petals: Attract pollinators for reproduction.
Richness and Evenness: Richness is the number of species; evenness is the relative abundance of each species in a community.

Natural selection is a process where organisms better adapted to their environment tend to survive and reproduce.

Natural Selection: Differential survival and reproduction of individuals due to differences in phenotype.
Phylogenetic Tree: A diagram showing evolutionary relationships among species.
Types of Selection: Directional, stabilizing, and disruptive selection.
Lab Demonstration: The lab may have demonstrated directional selection (e.g., selection for a trait in one direction).

Vertebrates have four main tissue types: epithelial, connective, muscle, and nervous tissue.

Epithelial Tissue: Covers body surfaces and lines cavities. Subtypes include squamous, cuboidal, and columnar.
Muscle Tissue: Responsible for movement. Types: skeletal (voluntary movement), cardiac (heart), smooth (involuntary movement).
Connective Tissue: Supports and binds other tissues. Examples: bone, cartilage, tendons, ligaments, adipose tissue, blood.
Nervous Tissue: Conducts electrical impulses.
Calcification: Following injury, calcium salts are deposited in bone tissue.

Muscle Type	Function
Skeletal	Voluntary movement
Cardiac	Pumps blood
Smooth	Involuntary movement in organs

Tissue Identification: Microscopy images are used to identify tissue types based on cell shape and arrangement.

Animals are classified into phyla based on body plan, symmetry, and developmental patterns.

Kingdom Animalia: Multicellular, heterotrophic, lack cell walls.
Phylum Without Tissues: Sponges (Phylum Porifera) lack true tissues.
Radial Symmetry: Cnidarians (e.g., jellyfish) and echinoderms (e.g., sea stars).
Protostomes vs. Deuterostomes: Protostomes develop mouth first; deuterostomes develop anus first.
Growth Patterns: Some phyla grow by molting (e.g., arthropods); others by adding body mass (e.g., annelids).
Keystone Species: Species with a disproportionately large effect on ecosystem structure (e.g., sea otters).
Sea Star Anatomy: Key features include arms (rays), central disc, tube feet, and madreporite.

Fish are vertebrates with specialized anatomical features for aquatic life.

Heart Chambers: Fish hearts typically have two chambers (one atrium, one ventricle); mammals have four.
External Anatomy: Includes fins (dorsal, pectoral, pelvic, anal, caudal), scales, and gills.
Internal Anatomy: Includes spine, gonads, digestive organs.
Paired Fins: Pectoral and pelvic fins are paired; dorsal and anal fins are unpaired.

Rat dissection reveals the structure and function of mammalian organ systems.

Muscle Groups: Major muscles include masseter (jaw), pectoralis (chest), biceps (arm), gastrocnemius (calf).
Organ Systems: Respiratory, circulatory, digestive, reproductive, urinary.
Whiskers: Scientific term is "vibrissae"; found on the anterior side.
Largest Organ: The liver is typically the largest internal organ.
Abdomen Location: The rat's abdomen is on the ventral side.
Sex Identification: External genitalia are used to identify sex.

Biomes are large ecological areas with distinct climate, vegetation, and animal life.

Key Factors: Rainfall, temperature, and vegetation are the most important factors in biome differentiation.
Major Biomes: Tropical forest, savanna, desert, chaparral, temperate grassland, temperate deciduous forest, coniferous forest/taiga, tundra.
Biome Features: Each biome has characteristic climate, plant types, and animal communities.
Kansas Biome: Kansas is primarily temperate grassland.
Herbivores: Large herbivores that feed on grasses are called "grazers".

Biome	Key Features
Tropical Forest	High rainfall, warm temperature, diverse vegetation
Savanna	Seasonal rainfall, grasses, scattered trees
Desert	Low rainfall, extreme temperatures, sparse vegetation
Chaparral	Mild, wet winters; hot, dry summers; shrubs
Temperate Grassland	Moderate rainfall, grasses, few trees
Temperate Deciduous Forest	Moderate rainfall, broadleaf trees
Coniferous Forest/Taiga	Cold, moderate rainfall, conifer trees
Tundra	Very cold, low rainfall, mosses and lichens