B5

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What is a group of specialised cells called?
Tissue
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What function does muscle cells do?
They contract and relax to cause movement
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What function does nerve cells do?
They carry nerve impulses
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Name same tissues
Bone, cartilage and blood
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What is a group of tissues called?
Organ
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Name some organs in humans
Heart and brain
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Name some organs in plants
Roots, leaves and flowers
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What does the xylem tissue do?
Transports water and minerals
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What does the phloem tissue do?
Transports sugar
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What is a zygote?
A fertilised egg cell
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What is the chemical that your genes are made of?
DNA
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What happens as the embryo grows?
Some of the new cells become specialised and form tissues
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After about two months, the main organs form and the developing baby is called?
A fetus
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What is a six-day embryo made of?
About 50 cells
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What happens at the 8 cell stage?
Sometimes it splits into two
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What are identical twins?
They are clones of each other
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What are some of the cells like in an early embryo?
Identical and unspecialised
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What are embryonic stem cells?
Unspecialised cells
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What do living things have to do in order to grow?
Their cells must divide to make new cells
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What are the dividing cells in plants called?
Meristem cells
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Where do plants make new cells?
At the tips of both shoots and roots
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Are plant meristem cells specialised?
No they are unspecialised
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Can plants regrow whole organs such as leaves?
Yes
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What are stem cells?
Cells which divide, grow and develop into specialised cells that the body needs
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What are cuttings?
Cuttings are shoots or leaves cut from a plant
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What plant hormone does rooting powder contain?
Auxins
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What does auxins do?
They cause the new cells produced by the base of the shoot meristem to develop into roots
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What is phototropism?
The bending of growing plant shoots towards the light
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What does phototropism do?
Increases plant's chances of survival
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What two things did Charles Darwin discover?
Young shoots grow towards the light and remained straight when he covered their tips
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What does higher concentrations of auxins cause?
It causes shoot cells to expand
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Name one specialised cell that loses its nuclei when they finish growing
Red blood cell
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What is the job of red blood cells?
To carry oxygen attached to the haemoglobin molecules
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What is a chromosome?
A chromosome is a long molecule of DNA wound around a protein framework
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What does each gene code for?
A protein
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How many pairs of chromosomes is in a human's nuclei?
23 pairs of chromosomes
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What does DNA's unique structure allow it to do?
Make exact copies of itself and provide instructions so that the cell can make the right proteins
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How many genes are there in a chromosome?
Thousands of genes
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Name some organelles
Ribosomes and Mitochondria
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What is mitosis?
Cell division that makes two identical cells
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Other cards in this set

Card 2

Front

What function does muscle cells do?

Back

They contract and relax to cause movement

Card 3

Front

What function does nerve cells do?

Back

Preview of the front of card 3

Card 4

Front

Name same tissues

Back

Preview of the front of card 4

Card 5

Front

What is a group of tissues called?

Back

Preview of the front of card 5
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