Cell Structure
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The Cell Theory
- Cell theory states that all living organisms are composed of one or more cells.
- The cell is the basic unit of life.
- All cells arise from pre-existing cells.
- This unifying theory underpins our understanding of structure, function, and continuity in living organisms.
Structure of Eukaryotic Cells
- Cell-surface membrane: controls substance entry/exit; composed of a phospholipid bilayer with embedded proteins.
- Nucleus: contains linear DNA (protein-bound as chromosomes); nucleolus produces ribosomes.
- Mitochondria: site of aerobic respiration and ATP production.
- Chloroplasts: site of photosynthesis (in plants/algae); contain chlorophyll.
- Golgi apparatus: modifies and packages proteins and lipids; forms vesicles e.g. lysosomes.
- Lysosomes: vesicles that contain hydrolytic enzymes for digesting worn-out organelles or pathogens.
- Endoplasmic reticulum: Rough ER (ribosome-covered) synthesises and transports proteins; Smooth ER synthesises and stores lipids and carbohydrates.
- Ribosomes: site of protein synthesis; 80S in eukaryotes and 70S in prokaryotes.
Additional Eukaryotic Structures
- Cell wall: provides strength/support; made from cellulose in plants and chitin in fungi.
- Vacuole: stores cell sap (in plants); helps maintain cell pressure and structure.
Specialisation of Eukaryotic Cells
- In multicellular organisms, eukaryotic cells become specialised to perform specific functions.
- Their structure is adapted to their role, which explains why different cell types can look very different.
- Structural adaptations may include cell shape and the presence or absence of specific organelles.
- Red blood cells are biconcave and lack a nucleus, creating more space for oxygen transport.
- Protein-producing cells contain many ribosomes to support high levels of protein synthesis.
Examples of Specialised Eukaryotic Cells
- Neurones (nerve cells): function is conduction of nerve impulses; cell body contains most organelles and is the site of protein synthesis; dendrites receive signals, axons transmit them; long axon (up to 1m) enables fast, long-distance transmission; myelin sheath insulates axon and increases speed of impulse conduction.
- Muscle cells: function is contraction for movement; three types in animals: skeletal, smooth, and cardiac; protein filaments (actin and myosin) slide over each other to cause contraction; high density of mitochondria for ATP production via respiration; skeletal muscle cells fuse during development to form multinucleated fibres.
- Sperm cells: function is fertilisation of the egg and delivery of the father's DNA; head contains haploid nucleus; acrosome contains digestive enzymes to penetrate the egg; mid-piece packed with mitochondria to provide energy for movement; tail rotates to propel the sperm towards the egg.
- Root hair cells: function is absorption of water and mineral ions from the soil; root hair increases surface area to maximise absorption; thin cell wall reduces diffusion distance; vacuole contains concentrated cell sap to maintain a water potential gradient; mitochondria provide ATP for active transport of mineral ions; no chloroplasts as they are found underground and not exposed to light.
- Xylem vessel cells: function is transport of water and dissolved mineral ions; no end walls between cells forming a continuous tube; cells are dead and lack organelles for unimpeded water flow; walls thickened with lignin for strength and structural support.
- Phloem vessel cells: function is transport of sugars and amino acids (translocation); living cells joined end-to-end with sieve plates for solute flow; few subcellular structures to aid transport; companion cells provide ATP and regulate transport processes.
Eukaryotic Cell Organisation
- In multicellular organisms, eukaryotic cells become specialised to carry out specific functions, e.g. epithelial cells in the small intestine absorb nutrients; red blood cells transport oxygen.
- Specialised cells of the same type form a tissue; a group of similar cells working together, e.g. epithelial tissue absorbs food in the small intestine; muscle tissue contracts to produce movement.
- Tissues combine to form an organ, e.g. the heart contains muscle, connective and vascular tissues.
- Organs work together as part of an organ system, e.g. the heart is part of the circulatory system.
- Levels of organisation: cell → tissue → organ → organ system.
- Examples: epithelial cell → epithelial tissue → stomach → digestive system; muscle cell → muscle tissue → bladder → urinary system; neurones (nerve cells) → nervous tissue → brain → central nervous system; rod and cone cells → retina (nervous tissue) → eye → visual system.
Structure of Prokaryotic Cells
- Animal and plant cells are types of eukaryotic cells, whereas bacteria are a type of prokaryote.
- Prokaryotic cells are much smaller than eukaryotic cells.
- They have a cytoplasm that lacks membrane-bound organelles.
- They have smaller, 70S ribosomes (in comparison to 80S ribosomes found in eukaryotic cells).
- They have no nucleus; instead, they have a single circular DNA molecule that is free in the cytoplasm and is not associated with proteins.
- They have a cell wall that contains murein.
- Additional structures in some prokaryotic cells: plasmids (small, circular loops of DNA; carry non-essential genes e.g. antibiotic resistance; can be transferred between prokaryotes); capsule (slime capsule; protective outer layer; prevents desiccation and helps evade immune system attack); flagella (singular: flagellum; long, rotating tail for motility; some bacteria have multiple flagella).
Prokaryotic v Eukaryotic Cells
- Size: Prokaryotes 0.5–5 μm diameter; Eukaryotes up to 100 μm diameter.
- Genome: Prokaryotes have circular DNA with no proteins, in the cytoplasm; Eukaryotes have DNA associated with histones (proteins), forming chromosomes.
- Cell division: Prokaryotes occur by binary fission, no spindle involved; Eukaryotes occur by mitosis or meiosis and involve a spindle to separate chromosomes.
- Ribosomes: Prokaryotes have 70S ribosomes; Eukaryotes have 80S ribosomes.
- Organelles: Prokaryotes have very few, no membrane-bound organelles; Eukaryotes have numerous types of membrane-bound organelles. Single membranes: lysosomes, Golgi complex, vacuoles. Double membranes: nucleus, mitochondria, and chloroplast. No membrane: ribosomes, centrioles, microtubules.
- Cell wall: Prokaryotes made of peptidoglycan (polysaccharide and amino acids) and murein; Eukaryotes present in plants (made of cellulose or lignin) and fungi (made of chitin, similar to cellulose but containing nitrogen).
Viruses
- Viruses are non-living because they are non-cellular; cannot reproduce independently (they require a host); do not grow or respond to stimuli; do not carry out protein synthesis (they use the protein-building machinery in host cells).
- They have no metabolic activity.
- All viruses are parasitic.
- They are much smaller than prokaryotic and eukaryotic cells.
- Structurally they have: genetic material (either DNA or RNA, and can be single or double-stranded); a capsid (a protein coat surrounding genetic material and containing attachment proteins); attachment proteins (these bind to receptors on host cells during invasion).
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Câu hỏi luyện tập
Xem trước miễn phí — 8 trên 61 câu hỏi. Đăng ký để xem tất cả.
1.Which of the following is NOT a statement of the cell theory?
Easy- AAll living organisms are composed of one or more cells.
- BThe cell is the basic unit of life.
- CAll cells arise from pre-existing cells.
- DAll cells possess a nucleus.
2.Which organelle is the site of aerobic respiration and ATP production?
Easy- AMitochondrion
- BChloroplast
- CRibosome
- DGolgi apparatus
3.Which of the following correctly describes the structure of the cell surface membrane?
Easy- AA phospholipid bilayer with embedded proteins
- BA cellulose wall with pores
- CA single layer of phospholipids with carbohydrates
- DA protein coat surrounding genetic material
4.Which of the following is a function of the lysosome?
Medium- ADigesting worn-out organelles or pathogens using hydrolytic enzymes
- BSynthesising proteins
- CModifying and packaging proteins and lipids
- DStoring cell sap
5.Which of the following structures is found in a prokaryotic cell but NOT in a eukaryotic cell?
Medium- APlasmid
- BMitochondrion
- CNucleus
- DGolgi apparatus
6.A prokaryotic cell measures 2 μm in diameter and a eukaryotic cell measures 0.1 mm. How many times larger is the eukaryotic cell than the prokaryotic cell?
Medium- A50
- B5
- C500
- D0.05
7.Which of the following is the correct definition of a tissue?
Easy- AA group of similar cells working together to carry out a specific function
- BA group of different tissues working together to carry out a specific function
- CA single specialised cell
- DA group of organs working together
8.Which of the following is a feature of viruses?
Medium- AThey possess a capsid made of protein
- BThey have 70S ribosomes
- CThey contain circular DNA associated with histones
- DThey can reproduce independently
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