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Magnification = image size / size of real object -ANS What is the equation for
magnification?
Light microscope, transmission electron microscopes, scanning electron microscopes -
ANS What are the names of the 3 microscopes?
Give 2D images with very high magnification and resolution -ANS Transmission
electron microscopes...
Give 3D images with lower magnification -ANS Scanning electron microscopes...
Cell membrane, nucleus, cytoplasm, mitochondria, ribosomes -ANS Animal cells
contain...
Chloroplasts, cell wall and a permanent vacuole -ANS What do plant cells contain, not
animal cells?
Cellulose strengthens the cell and gives it support -ANS What is the cell wall made from
and what do they do?
Chlorophyll absorbs light so the plant can make food by photosynthesis -ANS What do
chloroplasts contain and what does it do?
They increase the surface area available for water to move into the cell.
They have a large permanent vacuole that speeds up the process of osmosis from the
soil.
They have many mitochondria that transfer the energy needed for active transport of
mineral ions. -ANS Give 3 adaptions of the root hair cells
Xylem cells are alive when first formed but a chemical called lignin builds up in spirals in
the cell walls. The cells die and form hollow tubes that transfer water and mineral ions.
The spirals of lignin in the xylem cells make them very strong to help them withstand
pressure. -ANS Give 2 adaptions of xylem cells
Lots of dendrites to make connections to other nerve cells.
, An axon that carries nerve impulses from one place to another.
Synapses (nerve endings) are adapted to pass impulses to another cell using
transmitter chemicals; they also have lots of mitochondria to make the transmitter
chemicals. -ANS Give 3 adaptions of nerve cells
A long tail moves to help the sperm travel.
Lots of mitochondria for energy needed for the tail to work.
Acrosome stores digestive enzymes to break outer layer of egg.
Large nucleus allows for genetic information to be passed on. -ANS Give 4 adaptions of
sperm cells
Osmosis involves water only, needs a semi permeable membrane and high to low
concentration. -ANS Describe osmosis
Across a high to low concentration and involves the transport of solutes. -ANS Describe
diffusion
Requires energy, against concentration gradient, needs a semi permeable membrane
and involves the transport of solutes. -ANS Describe active transport
Used to test for carbon dioxide and goes cloudy if present -ANS What is lime water
used to test for and what happens?
Cell grows bigger, increases mass, and carry out normal cell activities. They replicate
their DNA to form 2 copies of each chromosome ready for cell division. -ANS Describe
stage 1 of the cell cycle
Mitosis occurs; one set of chromosomes is pulled to each end of the dividing cell and
the nucleus divides. -ANS Describe stage 2 of the cell cycle
The cytoplasm and the cell membranes also divide to form 2 identical daughter cells. -
ANS Describe stage 3 of the cell cycle
Unspecialised cells which can become any type of cell needed, found in the early
development of animal and plant embryos. -ANS What are stem cells and what are they
used for?
A group of cells with similar structure and function working together -ANS Define a
tissue
Collections of tissues each working together to perform a specific function -ANS Define
an organ
Groups of organs that all work together to form organisms e.g the digestive system -
ANS Define an organ system