What are all living things made up of?
What if the difference between a prokaryotic cell and a eukaryotic cell?
the prokaryotic cell has no neucleusProkaryote is simpler
What is the function of the nucleus?
To contain genetic material that controlling the activities the cell
What is the function of the cytoplasm?
The site where most chemical reactions happen
What is the function of the cell membrane?
To hold the cell together and controls what goes in and out
What is the function of the mitochondria?
to help with aerobic respiration
What is the function of the ribosomes?
To make proteins via protein synthasis
What type of cell are bacteria?
What is the formula for magnification?
image size/real size
Does a bacterial cell have a nucleus?
What is a plasmid?
a circular strand of DNA that floats freely in the cytoplasm
Do bacteria have mitochondria or chloroplasts?
What are chloroplasts?
where photosynthesis occurs. they make the food for the plant
What is cell differentiation?
a process where cells become specialised
What are sperm cells specialised for?
reproduction- streamlined head and ling tail
What are nerve cells specialised for?
rapid signalling- long and have branched connections
What are muscle cells specialised for?
contraction- long so they have space to contract
What are root hair cells specialised for?
absorbing water and minerals- big surface area
What are phloem and xylem cells specialised for?
transporting substances-long and hollow
What do chromosomes do?
contain genetic information
Why do we have 23 pairs of chromosomes?
Because we have one from the father and one from the mother
What is the function of the cell cycle?
make new cells for growth, development and repair
What is mitosis?
the stage in the cell cycle where the cell divides
How many stages are there in the cell cycle?
What happens in the growth and DNA replication stage?
cell grows and duplicates its DNAincreases sub cellular structures like mitochondria and ribosommes
What are the stages of Mitosis?
chromosones line upcell fibres pull them apart membarnes form about each set of chromosonescytoplasm and membrane divide
How do prokaryotic cells divide?
By binary fission
What occurs in binary fission?
plasmids replicatestrands move to opposite polescytoplasm begins to divide2 daughter cells are produced
A bacterial cell has a mean division time of 30 mins. how many times will it divide in 3 hours?
3 x 60= 180180/30=6 times
What temperature do we culture microorganisms at?