2169959
Description
Edexcel - B2
- Topic One - Genes and Enzymes
- Cells and Microscopy
- Pant and Animal cells
have similarities and
differences
- Similarities:
- Nucleus - Contains
DNA, controls what the
cell does
- Cytoplasm -
gel-like
substance where
most reactions
happen
- Cell Membrane - holds cell
together, controls what
enters and leaves
- Mitochondria - where most
respiration takes place
- Nucleus - Contains
DNA, controls what the
cell does
- Differences -
only plant
cells
- Rigid Cell Wall - made
of cellulose, provides
support
- Large Vacuole -
contains cell sap
- Chloroplasts - where
photosynthesis occurs,
contain chlorophyll
- Rigid Cell Wall - made
of cellulose, provides
support
- Similarities:
- Bacterial Cells
- They are much smaller than plant
or animal cells
- Chromosomal DNA - one long circular
chromosome, controls activities and
replication, floats free in cytoplasm
- Plasmids - small loops of extra DNA,
contains genes for things such as drug
resistance, passed between bacterial
- Flagellum - hair like structure
that rotates to move the cell
- Cell Wall - provides support for the cell
- Chromosomal DNA - one long circular
chromosome, controls activities and
replication, floats free in cytoplasm
- They are much smaller than plant
or animal cells
- Cells are studied using microscopes
- Light microscopes - 1590s,
see nuclei, chloroplasts,
mitochondria
- Electron microscopes - 1930s,
smaller things in more detail,
internal structure of mitochondria
and chloroplasts, plasmids
- Calculate magnification -
length of image/length of
specimen
- Light microscopes - 1590s,
see nuclei, chloroplasts,
mitochondria
- Pant and Animal cells
have similarities and
differences
- Cells and Microscopy
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