General Biology Lab Exam 2 Study Guide: Key Concepts and Applications

Study Guide - Smart Notes

Tailored notes based on your materials, expanded with key definitions, examples, and context.

This section covers the biology of yeast cells, their classification, and their role in fermentation processes.

Yeast Cell Classification: Yeast cells are eukaryotic microorganisms, meaning they possess a nucleus and membrane-bound organelles.
Fermentation Detection and Measurement: Fermentation in yeast can be detected by measuring the production of carbon dioxide (CO2) and ethanol. Common methods include gas collection and chemical assays.
Monosaccharides, Disaccharides, and Polysaccharides: Yeast can utilize various sugars as food sources.
- Monosaccharides: Simple sugars (e.g., glucose, fructose)
- Disaccharides: Two monosaccharides joined together (e.g., sucrose, maltose)
- Polysaccharides: Long chains of monosaccharides (e.g., starch, cellulose)
Fermentation Equation: (Glucose is converted to ethanol and carbon dioxide)
Cellular Respiration vs. Fermentation:
- Cellular respiration is an aerobic process producing more ATP.
- Fermentation is anaerobic and produces less ATP.
Enzyme Activity: Enzymes such as catalase are affected by temperature and pH, which can alter their rate of reaction.

This section explores the effect of light on photosynthesis and the use of chromatography to separate plant pigments.

Effect of Light on Photosynthesis: Photosynthesis rate can be measured by oxygen production under different light conditions (e.g., white light, green filter).
Spectrophotometry: A spectrophotometer measures the absorption of light by pigments at different wavelengths.
Chromatography: Technique used to separate plant pigments based on their solubility and affinity for the stationary phase. Rf Value Equation:
Plant Pigments:
- Chlorophyll a and chlorophyll b: Main pigments for photosynthesis
- Carotenoids: Accessory pigments that protect against photo-damage
Light and Dark Reactions:
- Light reactions occur in the thylakoid membranes and produce ATP and NADPH.
- Dark reactions (Calvin cycle) occur in the stroma and use ATP and NADPH to fix CO2.
pH and Photosynthesis: The pH of the medium can change during photosynthesis due to CO2 uptake and release.

This section focuses on the stages of cell division, including mitosis and meiosis, and their biological significance.

Mitosis: Division of somatic cells resulting in two genetically identical daughter cells. Stages include prophase, metaphase, anaphase, and telophase.
Meiosis: Division of germ cells resulting in four genetically unique gametes. Includes two rounds of division: meiosis I and meiosis II.
Chromosome Number:
- Diploid (2n): Two sets of chromosomes (somatic cells)
- Haploid (n): One set of chromosomes (gametes)
Cell Cycle: Includes interphase (G1, S, G2) and mitotic phase (M).
Key Differences:
- Mitosis produces identical cells; meiosis produces genetically diverse cells.
- Meiosis includes crossing over and independent assortment.

This section covers the structure of DNA, its replication, and the use of restriction enzymes and gel electrophoresis in biotechnology.

DNA Structure: Double helix composed of nucleotides (adenine, thymine, cytosine, guanine).
Base Pairing:
DNA Replication: Semi-conservative process where each new DNA molecule contains one old and one new strand.
Restriction Enzymes: Proteins that cut DNA at specific sequences, used in genetic engineering.
Gel Electrophoresis: Technique to separate DNA fragments by size using an electric field and agarose gel.
Ligase: Enzyme that joins DNA fragments together.

This section examines homologous structures, evolutionary relationships, and adaptations in vertebrates and invertebrates.

Homologous Structures: Anatomical features shared by different species due to common ancestry (e.g., forelimbs of vertebrates).
Analogous Structures: Features with similar function but different evolutionary origins (e.g., wings of birds and insects).
Phylogenetic Trees: Diagrams showing evolutionary relationships among species.
Comparative Anatomy: Study of similarities and differences in the anatomy of different organisms.
Adaptations: Traits that improve an organism's ability to survive and reproduce in its environment.
Horse Evolution: Modern horses have evolved larger teeth and longer legs for grazing and running.

This section focuses on the analysis and interpretation of experimental data, including graphing and statistical evaluation.

Graphing Data: Plotting data points (e.g., plant growth under different light conditions) and interpreting trends.
Independent and Dependent Variables:
- Independent variable: Factor manipulated in the experiment (e.g., light exposure)
- Dependent variable: Factor measured (e.g., plant height)
Data Analysis: Comparing means, identifying patterns, and drawing conclusions from experimental results.
DNA to Protein Chart: Translating DNA sequences to mRNA and then to protein using codon charts.

Some context and explanations have been expanded for clarity and completeness.
Examples and definitions have been added to ensure the notes are self-contained and suitable for exam preparation.