Prokaryotic and Eukaryotic Cells -
Overview
Topic: Distinguishing prokaryotic and eukaryotic cells by distinguishing features.
Source content covers major structures, comparison, and practice identifying organelles in prokaryotes vs eukaryotes.
Includes a taxonomy of organisms (Archaea, Bacteria, Eukarya) and a basic activity analyzing presence/absence of organelles in cell types.
What is a cell?
All organisms are made up of one or more cells.
The basic unit of structure and function of all living organisms.
New cells are produced from pre-existing cells.
Key concepts and objectives
Distinguish prokaryotic and eukaryotic cells according to distinguishing features.
Identify major structures present in prokaryotic and eukaryotic cells.
Compare and contrast prokaryotic and eukaryotic cells.
Identify prokaryotic and eukaryotic organisms.
Prokaryotic cell components (as listed in the transcript)
Plasma membrane
Cytoplasm
Nucleoid (DNA)
Ribosomes
Cell wall
Capsule
Pili (Pilus)
Flagellum
Mesosome
Plasmid
DNA (genetic material within the nucleoid region)
Peroxisome (noted in the prokaryotic context in the transcript; typical prokaryotes do not have a true peroxisome, but the slide includes it among organelles listed for consideration)
Eukaryotic cell components (as listed in the transcript; with plant-specific examples)
Plasma membrane
Cytoplasm
Nucleus (contains nucleolus and nuclear membrane)
Ribosomes
Endoplasmic reticulum (rough and smooth)
Golgi apparatus
Mitochondrion
Chloroplast (primarily in plants and some algae)
Vacuole (large central vacuole in plants; others have smaller vacuoles)
Plasmodesmata (plant cell connections)
Nucleolus
Nuclear envelope
Non-membrane bound components: centrosome, cytoskeleton, cell wall (in plants, fungi), plasmodesmata, etc.
Anatomy highlights: Plant cell vs general eukaryotic features
Plant cell-specific organelles/features: Chloroplasts, Large central vacuole, Plasmodesmata, Cell wall.
General eukaryotic features: Nucleus with nuclear envelope and nucleolus; membrane-bound organelles (ER, Golgi, mitochondria, chloroplasts in plants); cytoskeleton; ribosomes; plasma membrane.
Non-membrane bound components: Centrosome (in many animal cells), cytoskeleton, etc.
Activity: organelle presence in Prokaryotic vs Eukaryotic cells
Prokaryotic cell versus Eukaryotic cell: presence (√) or absence (X) of various components:
Plasma membrane: present in both (√, √).
Cytoplasm: present in both (√, √).
Nucleus (and subparts):
Nucleus: Prokaryotic X; Eukaryotic √.
Nuclear membrane: Prokaryotic X; Eukaryotic √.
Nucleolus: Prokaryotic X; Eukaryotic √.
Genetic material (DNA): present in both (√, √) (note: prokaryotes have DNA in the nucleoid region, not within a nucleus).
Cell wall: Present in both (√, √).
Ribosomes: Present in both (√, √).
Vacuole: Present in both (√, √).
Membrane-bound organelles (ER, Golgi, Chloroplast, Mitochondrion): Prokaryotic X; Eukaryotic √ for all listed.
Other organelles (write): Capsule, plasmid: Prokaryotic √; Eukaryotic X.
Mesosome, flagellum, pilus: Generally associated with prokaryotes (listed as X or not present under typical eukaryotes in this activity).
Summary of domain organization (as shown in the transcript)
Archaea, Bacteria, Eukarya are the primary domains/groups:
Archaea: Methanogens, Halophiles, Thermophiles (organisms typical of Archaea).
Bacteria (Eubacteria): Cyanobacteria among others.
Eukarya: Animals, Protists, Fungi, Plants.
PROKARYOTA encompasses Archaea and Bacteria; Eukarya includes the aforementioned eukaryotic kingdoms.
Questions to review (based on activity)
a) What major structures are found only in prokaryotic cells?
Nucleoid (DNA not enclosed in a nucleus), Capsule, Plasmids, Mesosome/ Pili/ Flagella (organelles not typically membrane-bound).
b) What major structures are present only in eukaryotic cells?
Nucleus with nuclear envelope, Nucleolus, and membrane-bound organelles (ER, Golgi, mitochondria, chloroplasts, lysosomes, etc.).
c) What structures are common to prokaryotic and eukaryotic cells?
Plasma membrane, Cytoplasm, Ribosomes, DNA (in some form).
d) What are the major differences between prokaryotic and eukaryotic cells?
Location of genetic material (nucleoid vs nucleus), presence vs absence of membrane-bound organelles, level of cellular compartmentalization and organizational complexity.
Practice activity (classification)
Exercise: Given a set of organisms, determine whether they have prokaryotic or eukaryotic cells by writing P for prokaryotic or E for eukaryotic.
Note: The transcript lists this as an exercise (no specific organisms provided in the text excerpt).
General concepts and classifications
Generalization 1: How are cells classified as prokaryotic or eukaryotic? Based on the presence or absence of a nucleus, the presence or absence of membrane-bound organelles, and the overall cellular organization.
Generalization 2: Differentiation criteria:
DNA location: nucleoid (no membrane) vs nucleus (membrane-bound).
Membrane-bound organelles: present in eukaryotes; absent in prokaryotes.
Complexity of organization: more compartmentalization in eukaryotes due to organelles.
Quick reference: key terminology and groupings
Prokaryotes include two major domains: Archaea and Bacteria (Eubacteria), collectively referred to in the transcript as PROKARYOTA.
Archaea subgroups highlighted: Methanogens, Halophiles, Thermophiles.
Bacteria examples noted: Cyanobacteria (photosynthetic), among others.
Eukarya includes Animals, Protists, Fungi, Plants.
Plant cells feature plasmodesmata, chloroplasts, vacuoles, a cell wall; animal cells do not have plasmodesmata or chloroplasts and have centrosomes.
Formulas or numerical references
None explicitly provided in the transcript. All content is descriptive and comparative rather than mathematical.
If you’d like, I can tailor these notes to focus more on the areas you expect to see on the exam (e.g., more emphasis on the organelle presence/absence table, or on the domain organization).