a nucleus is 10 micro metres across and is magnified 5000 x. how big is the image?
image size = actual size x magnification
50mm
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what does the cell membrane do?
controls what goes in and out: glucose, mineral ions and hormones
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what are chloroplasts?
contain chlorophyll which absorbs light for photosynthesis
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what is cytoplasm
liquid where organelles suspended and chemical reactions for life take place
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what do the mitochondria do
where aerobic respiration take place
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what does the nucleus contain
genes to carry instructions for proteins to build new cells
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what do ribosomes do
where protein synthesis takes place
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what are:
bacteria cells called
animal, plant and fungi cells called
prokaryotic
eukaryotic
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three differences of eukaryotic and prokaryotic cells
eukaryotic are bigger
prokaryotic had just cytoplasm, ribosomes- no nucleus, mitochondria or chloroplasts
eukaryotic cells use mitosis, prokaryotic binary fission
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what is diffusion
spreading out of particles
resulting in net movement
from an area of high concentration
to an area of lower concentration
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what is a solute and a solvent
solute - thing being dissolved
solvent - thing dissolving the solute
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meanings of
flaccid
turgid
plasmolysed
f - what happens in hypertonic solution
t - happens in hypotonic solution
p - cell membrane pulling away from cell wall
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define active transport
movement of particles from an area of low to high concentration
against a concentration gradient
requires energy from respiration and oxygen
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why are arctic animals larger than those in hot environments on average
the larger you are, the smaller your surface area is in comparison, meaning relatively less heat loss.
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why do shrews need a high metabolic rate
they are very small, so have a large relative surface area, so lose a lot of energy via surface area, and must have a fast metabolism to keep replacing it
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what are the phases of the cell cycle?
interphase
mitosis
cytokinesis
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what happens in interphase
DNA replicates
new cell organelles are formed
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what happens in mitosis
nucleus divides
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what happens in cytokinesis
cytoplasm and cell membrane divides
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describe the steps of mitosis
DNA copies itself
move to cell equator
2 copies of each chr pulled to poles of cell
cytoplasm + membrane divide
2 identical daughter cells
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Other cards in this set
Card 2
Front
How many centimetres in a pico metre?
Back
10,000,000,000
Card 3
Front
a nucleus is 10 micro metres across and is magnified 5000 x. how big is the image?
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