Flashcards
GCSE Biology Topic 1 Flashcards
Cards in this deck (7)
- 1State one advantage and disadvantage of using i. a light microscope ii. an electron microscopeLight microscopes
• cheap
• allow you to see large subcellular structures
Electron microscopes:
•allow you to look at smaller subcellular structures (ribosomes etc.)
• are very expensive - 2List the main structures you would expect to find in a human cell•Cell membrane
•Nucleus
•Cytoplasm
•Mitochondria
•Ribosomes - 3State three extra features found in plant cells•Cell wall
•Chloroplasts
•Vacuole - 4What is the difference between the genetic material in a prokaryotic cell and eukaryotic cell?Prokaryotic cells contain a single loop of DNA as well as extra small rings of DNA called plasmids. Whereas, a eukaryotic cell's genetic material is contained in the nucleus.
- 5Describe what flagella areThey are long protein strands that lashes about, helping the bacteria move.
- 6State one adaptation for each of the following: •a nerve cell •a muscle cell •a sperm cell1. Nerve cells are very long in order to carry nerve impulses from one place to another.
2. Muscle cells contain mitochondria to transfer energy needed to contract.
•The acroscome (head) of the sperm contains mitochondria to break the outer layer of the egg. - 7Suggest why a cell within a tree trunk cannot carry out photosynthesisThis cell won't be able to perform photosynthesis due to its positioning as it will not be able to recieve any sunlight.