A2.2 Cell Structure

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28 Terms

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Cell Theory

  • All living things are made of cells

  • Cells can only arise from other pre-existing cells

  • Cells are the smallest unit of life

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What structures do all cells have?

Plasma membrane, cytoplasm, genetic material, ribosomes, cilia/flagella

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Cell wall function

Maintains shape of the cell

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Plasma membrane function

separates the internal and external environment of the cell and is selectively permeable

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Cytoplasm function

Provides space for organelles to do work

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Ribosomes functions

Synthesize proteins

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Genetic material (DNA/RNA) function

Allows cells to produce proteins to perform functions of life

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Mitochondria function

Produces ATP for the cell to perform living functions

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Rough Endoplasmic Reticulum function

transports and finishes biological molecules like proteins

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Smooth Endoplasmic Reticulum function

makes lipids and detoxes

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Golgi Apparatus function

processes proteins, labels products with glycoproteins

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Vesicles function

Storage and transport

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Lysosomes functions

Digestion and breaking down waste products

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Cytoskeleton function

Helps cell maintain its shape

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What organelle is only present in animal cells?

Lysosomes, centrioles, cilia/flagella

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What organelles are only present in plant cells?

Chloroplast, central vacuole, and cell wall

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Chloroplast Function

Performs photosynthesis

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Vacuole Function

Stores or expels water from the cell

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Processes of Life in unicellular organisms

Reproduction, maintaining homeostasis, growth, excretion, movement, response to stimuli

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Fungi Cell structure

Cell walls made of chitin, no chloroplasts, grow without light/oxygen

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Atypical cell structure examples

Muscle cells, red blood cells, aseptate fungal hyphae, Phloem sieve tube cells

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Muscle cells structure

Striated, multi-nucleated, large in size

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Red blood cells structure

No nucleus, bioconcave shape, absence of organelles

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Aseptate fungal hyphae structure

Multi-nucleated, continuous cytoplasm/multiple units, chitin cell walls

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Phloem sieve tube cells structure

Lack of nucleus and organelles

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Origin of cells by endosymbiosis

Larger eukaryote engulfed smaller prokaryote, leading to the development of the chloroplast/mitochondria

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Evidence for endosymbiosis

Mitochondria and Chloroplasts have a double membrane, 70S ribosomes, divide by binary fission, and have circular DNA that is separate from the rest of the cell

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Cellular Differentiation

The expression of specific genes to carry out specific functions