Biology Flashcards
What is a cell
A Living organism. Building blocks of life. Smallest units found in an organism.
How to use a microscope to observe a cell.
- move the stage to its lowest position
- place the object on the stage.
- select the objective lens with lowest magnification and look through the eyepiece
- you should see the object
Cell components functions
Cytoplasm.where chemical reactions take place.
Cell membrane.controls what goes in and out of the cell.
Nucleus.controls the cell and contains genetic information
Mitochondria. Where respiration occurs.
Cell wall. Strengthens the cell
Vacuole. Keeps the cell firm.
Chloroplasts.where photosynthesis occurs.
Similarities and differences between plant and animal cells.
Animal cell. Cytoplasm ,cell membrane , nucleus ,mitochondria.
Plant cell. Everything a animal cell has plus cell wall , vacuole and chloroplasts
The type of organism or tissue the cell comes from based on its features.
You can tell that a root hair cell comes from a plant organism because plants get there water through sucking water up through the ground.whereas a nerve cell is found in organisms like humans and animals who need these cells in order to transmit electrical impulses around the body to control all movement.
Describe examples of specialised plant and animal cells.
Nerve cell. Long and thin and have connections at each end where they can join to other nerve cells.
Red blood cells.disk like shape which increases surface area for carrying oxygen.
Leaf cells.long and thin and are packed with chloroplasts . Large surface area.
Root hair cells. Roughly rectangular with a long bit extending of its lateral end.
Explain how unicellular organisms are adapted to carry out different functions.
Move by changing shape of body.they can make part of there body move in the direction they want to travel.
What a unicellular organism is.
Made up of just one cell. Not a plant or animal as these are made up of lots of cells.
Examples of specialised plant and animal cells.
Plant cell. Lear cell and root hair cell
Animal cell. Nerve cell and red blood cell.
Identify structures in an amoeba and euglana.
Amoeba.Has not fixed shape and looks a bit like a blob of jelly.
Euglena. Tail like structure..
Substances that move in and out of cells.
Water, oxygen , carbon dioxide
Process of diffusion.
Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
