Cells Flashcards
What are cells
The basic unit of life
Whats is an Organism
A living thing that can function on it’s own
What is unicellular
An organism that exits as only one cell
What is multicellular
An Organism made of many cells
What is an example of a Multicellular organism
human or oak tree
what is an example of a unicellular organism
bacteria
What is a zygote
A cell that is formed when the egg is fertilised by the sperm
What is a stem cell for
essential for growth, development and repair
What is an example of stem cell
zygote
whats an embryonic stem cell
A stem cell that is undifferentiated, can become any type of cell.
when is embryonic stem cells present
only early stage of embryo
what are tissue stem cells
only part specialised. can only become cells belonging to a specific type of tissue
Whats an example of tissue stem cell
liver tissue stem cells only can become liver cells
Whats cell divison
when a parent cell divides to produce two identical daughter cells
whats cell division essential for
growth and repair of tissues
what is mitosis
the division of the nucleus during cell division
what does mitosis help with
ensures both daughter cells have the same genetic info/number of chromosomes
whats a chromosome
thread-like structures composed of DNA
where are chromosomes found
Found in nucleus, visible before cell division
what is spindle fibre
it attaches to pairs of chromatids to pull them apart to opposite poles of the cell during mitosis
whats chromosome complement
the number of chromosomes an organism has
how many chromosomes does a regular human have
46 chromosomes, 23 pairs
whats the cause of an uncontrollable form of cell division
cancer
