GCSE Edexcel Biology: Topic 1
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Last updated 6:30 PM on 10/17/22
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43 Terms
1
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Animal cells have
Cell membrane
mitochondria
nucleus
ribosomes
mitochondria
nucleus
ribosomes
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Plant cells have
chloroplasts
Cell membrane
Cell wall
mitochondria
nucleus
ribosomes
vacuole
Cell membrane
Cell wall
mitochondria
nucleus
ribosomes
vacuole
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Bacteria cells have
Chromosomal DNA (loop)
cell membrane
cell wall
Flagellum
plasmid DNA
ribosomes
cell membrane
cell wall
Flagellum
plasmid DNA
ribosomes
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Sperm cells have
Acrosome
haploid nucleus
Mitochondria
streamlines shape
tail
haploid nucleus
Mitochondria
streamlines shape
tail
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Acrosomes (sperm)
Contains enzyme breaks egg's coat
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Haploid nucleus (sperm)
single set of unpaired chromosomes
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Mitochondria (sperm)
Releases energy
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Tail (sperm)
Propell
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Egg cell stuff
cell membrane
haploid nucleus
Nutrients in cytoplasm
haploid nucleus
Nutrients in cytoplasm
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Cell membrane (egg)
jelly coat hardens after fertilisation
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Nutrients in cytoplasm (egg)
Develops embryo
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Ciliated epithelial cells stuff
Cell membrane
epithelial
strands of a substance
epithelial
strands of a substance
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Cell membrane (ciliated)
Covers
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Epithelial (ciliated)
No hair-like structures
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Strands of substance (ciliated)
Contract causes wavy movement
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Image =
actual x magnification
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How to change focus
Adjust objective lens and focus knob
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Magnification =
Eyepiece x objective lens
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Light microscope mag
X1500
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Light microscope resolution
0.0001nm
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Electron microscope mag
X2000000
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Electron microscope resolution
0.0000002nm
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What does pH do to enzymes
Break bonds
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Lock and key theory
Substrate fits active site
Enzyme-substrate complex
Enzyme-substrate complex
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What's an inhibitor
Slows enzyme reaction
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Increase enzyme concentration
Faster reactions
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Enzymes are ...
Proteins
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Experiment on enzymes
Iodine on dimples on tile
Amylase on test tube
1cm3 of pH solution
add starch solution
start clock
every 20 secs
Amylase on test tube
1cm3 of pH solution
add starch solution
start clock
every 20 secs
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Benedicts tests for
reducing sugars
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Benedict's positive
Brick red
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Benedicts negative
blue
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Biurets tests for
Protein
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Biurets positive
purple
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Biuret's negative
pale blue
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Ethonal emulsion tests for
Fats/lipids
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Ethonal emulsion positive
Cloudy emulsion
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Ethonal emulsion negative
Clear
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Iodine tests for
starch
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Iodine positive
blue-black
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Iodine negative
Yellow-orange
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Osmosis
Water molec diffuse from high conc of water molec to low conc of water molec through a partially permeable membrane
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Active transport
Movement of dissolved molec through the cell membrane from lower conc to a high conc against conc gradient using energy from resp
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Diffusion
Random movement of a substance from a region of high con to a region of low conc
