Ch 08 - Cell : The Unit of Life11th Biology
Milestones in Cell Discovery
Which three scientists are credited with the initial discoveries of the cell, the live cell, and the nucleus, respectively?
Which three scientists are credited with the initial discoveries of the cell, the live cell, and the nucleus, respectively?
- Robert Hooke (1665): Discovered the cell by observing empty chambers in a piece of cork.
- Antonie Von Leeuwenhoek: First to see and describe a live cell.
- Robert Brown (1831): Discovered the nucleus.
Prism Memory Hook
Hooke = Hollow cork; Leeuwenhoek = Live; Brown = Brain of cell (Nucleus).
Formulation of Cell Theory
Who were the two scientists that jointly formulated the initial Cell Theory, and what was Schwann's unique finding about plant cells?
Who were the two scientists that jointly formulated the initial Cell Theory, and what was Schwann's unique finding about plant cells?
- Matthias Schleiden (1838): A German botanist who observed that all plants are composed of cells.
- Theodore Schwann (1839): A German zoologist who studied animal cells (identifying the plasma membrane).
- Schwann's Unique Finding: Based on his plant tissue studies, he uniquely concluded that the presence of a cell wall is a unique character of plant cells.
Prism Memory Hook
Schleiden = Shrubs (Botanist); Schwann = Swan (Zoologist).
Modern Cell Theory & Rudolf Virchow
What major loophole in the original Cell Theory did Rudolf Virchow resolve in 1855, and what was his famous Latin phrase?
What major loophole in the original Cell Theory did Rudolf Virchow resolve in 1855, and what was his famous Latin phrase?
- The Loophole: Schleiden and Schwann did not explain how new cells were formed.
- Virchow's Contribution: He explained that cells divide and new cells are strictly formed from pre-existing cells.
- Famous Phrase: Omnis cellula-e cellula.
Prism Memory Hook
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Also in this chapter
51 more cards to study in Prism
- 4G.N. Ramachandran & Protein Structure
- 5Cell Size Extremes
- 6Prokaryotes vs. Eukaryotes: Core Boundaries
- 7The Four Basic Shapes of Bacteria
- 8Gram Staining Classification
- 9Prokaryotic Cell Envelope Layers
- 10Glycocalyx Modifications
- 11Mesosomes: Structure & Function
- 12Chromatophores in Cyanobacteria
- 13Bacterial Flagellum Anatomy
- 14Pili vs. Fimbriae
- 15Plasmids in Prokaryotes
- 16Prokaryotic Ribosomes & Polysomes
- 17Inclusion Bodies in Prokaryotes
- 18Plant Cells vs. Animal Cells
- 19Plasma Membrane Composition (RBC)
- 20Lipid Arrangement in Plasma Membrane
- 21The Fluid Mosaic Model
- 22Membrane Protein Classification
- 23Passive Transport vs. Active Transport
- 24Biochemical Composition of Algal Cell Wall
- 25Biochemical Composition of Plant Cell Wall
- 26Primary vs. Secondary Cell Wall
- 27Middle Lamella & Plasmodesmata
- 28The Endomembrane System
- 29Rough vs. Smooth Endoplasmic Reticulum
- 30Golgi Apparatus: Morphology & Polarity
- 31Golgi Apparatus: Biosynthetic Role
- 32Lysosomes: Hydrolytic Activity
- 33Mitochondria: Inner Membrane & Cristae
- 34The Vacuole and Tonoplast
- 35Specialized Vacuoles in Protists
- 36Mitochondrial Semi-Autonomy
- 37Chromoplasts
- 38Leucoplasts & Their Subtypes
- 39Chloroplast: Size and Count Variations
- 40Chloroplast: Thylakoids & Stroma Lamellae
- 41Chloroplast: Stroma Composition
- 42Eukaryotic Ribosomes: Structure
- 43The Cytoskeleton
- 44Cilia & Flagella: The Axoneme Core
- 45Centrosome & Centrioles: Cartwheel Structure
- 46Microbodies
- 47Classification of Chromosomes
- 48Nucleus: Nuclear Envelope & Pores
- 49The Nucleolus & Its Abundance
- 50Boundary Exceptions: Enucleated Living Cells
- 51Chromosome Anatomy: Centromere & Kinetochore
- 52Mitochondria: Exact Dimensions
- 53Satellite Chromosomes
- 54Human Genomic DNA Length
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