B1 Cell biology Flashcards
What is the difference between a eukaryotic cell and a prokaryotic cell?
A eukaryotic cell is a cell that has genetic material enclosed in a nucleus.
A prokaryotic cell is a cell where the genetic material is not enclosed in a nucleus.
What is the role of the cytoplasm?
The cytoplasm is where many chemical reactions of the cell take place.
What is the role of the cell membrane?
The cell membrane allows substances in and out of the cell.
What is the role of the mitochondria?
The mitochondria is the site of respiration.
What is the role of ribosomes?
Ribosomes are the site of protein synthesis.
What is the role of the cell wall?
The cell wall provides structure and support to a plant cell.
What is the role of the chloroplasts?
The chloroplasts are the site of photosynthesis in plant cells.
Name 3 organelles found in a plant cell but not in an animal cell.
3 organelles that are only found in plant cells are:
- Cell wall
- Chloroplasts
- Permanent Vacuole
What is a specialised cell?
A specialised cell is a cell that is adapted to its function.
Describe and explain 3 ways in which a sperm cell is specialised.
A sperm cell is specialised because it has:
- a tail so that it can swim towards the egg for fertilisation.
- Many mitochondria so that it can produce energy for movement.
- An acrosome containing digestive enzymes to penetrate the egg
Describe and explain how a nerve cell is specialised.
Nerve cells are specialised to carry electrical impulses around the body. They have several adaptations including;
- Dendrites to make connections to other nerve cells.
- Long axons that carry the impulse from one place to another
- A myelin sheath for insulation
- Synapses contain many mitochondria to produce the energy needed to make neurotransmitter
Describe and explain how a muscle cell is specialised.
Muscle cells are adapted to contract and relax. Striated muscle cells have three main adaptations;
- They contain special proteins that slide over each other making the fibres contract.
- They contain many mitochondria to produce the energy needed to contract and relax.
- They can store glycogen which is used to produce energy.
Describe and explain the adaptations of root hair cells.
Root hair cells have 3 main adaptations:
- They have a projection which increases the surface area available for water to move in to the cell.
- They have a large permanent vacuole which speeds up the movement of water in to the cell
- They have many mitochondria to produce the energy needed to move ions and minerals in to the cell.
Compare the maginification and resolution of a light microscope and an electron microscope.
An electron microscope has a much higher magnification and resolving power than a light microscope. This means that it can be used to study cells in a much finer detail.
Describe how bacteria multiply.
TRIPLE ONLY
Bacteria multiply by binary fission as often as every 20 minutes.