9700 · 1.2
Cells as the basic units of living organisms — FAQ
Frequently asked questions for 9700 Cells as the basic units of living organisms. Direct answers first, then deeper explanation — then practise with marking.
What is cell theory in Cambridge Biology 9700?
The cell theory is a fundamental concept in Cambridge 9700 Biology, stating three key principles: all living organisms are made of cells, cells are the basic units of life, and all cells arise from pre-existing cells. Mastering these tenets is crucial for understanding biology.
How do prokaryotic and eukaryotic cells differ for AS Biology?
For AS Biology, the main differences are that eukaryotic cells have a true nucleus and membrane-bound organelles (like mitochondria and ER), while prokaryotic cells lack these. Prokaryotic DNA is circular in a nucleoid region, and they have smaller 70S ribosomes, whereas eukaryotes have linear DNA in the nucleus and larger 80S ribosomes in the cytoplasm.
What are the characteristics of living organisms (MRS GREN) for 9700?
In Cambridge 9700 Biology, all living organisms share seven characteristics, remembered by the acronym MRS GREN: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition. You need to not only list these but also be able to explain what each characteristic means.
How do I calculate magnification from a micrograph?
Use the formula: Magnification = Image size / Actual size. Make sure both 'Image size' and 'Actual size' are in the same units before you calculate. You can rearrange the formula to find any of the three variables if the other two are known.