Cells are the basic building blocks of life - no wonder then that they are studied in GCSE biology! Year 10 and Year 11 pupils look at their structure and parts, such as cytoplasm, mitochondria, nucleus and ribosomes. Can you remember them all, and their
The number of particles within an atom in its nucleus The number of protons in an atom in its nucleus The number of neutrons in an atom in its nucleus The number of electrons in an atom in its nucleus 9 . Atoms of an element always have the same number of protons but can have...
It is well known that, "Neil bohr failed in his model in which he described an electron as a charged particle moving in well defined circular orbits about the nucleus." However he failed because of the two major reasons.. a) It didn't consider the wave nature of the electrons b) contr...
The cell contents i.e. the sub-cellular structures like cytoplasm, nucleus, (small vacuoles), mitochondria etc. are all held together and enclosed, by the soft cell membrane which controls the passage of substances in and out of the cell. Because not everything can pass through the membrane,...
a zinc sulphide screen, surrounding the gold foil. A few were deflected and some of these were deflected at angles greater than 900, suggesting they had been repelled by large positive charges within the foil - nuclei of atoms of gold. Arrangement of electrons around the nucleus From GCSE ...