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any three from: no cell wall in animal cells/ (cellulose) cell wall in plant cell centrioles present in animal cell, not in present in plant cell (permanent) vacuole in plant cell, lack of (permanent) vac...

H+ ions and electrons released from NADH and FADH2,on to the inner mitochondrial membrane. electrons enter electron transport chain, and energy released from transfer of electrons is used to pump H+ ions ...

A nerve impulse in the sarcoplasmic reticulum causes calcium ions to move out of it into the muscle cells where it binds to tropmyosin/troponin causing it to move and reveal the actin filament. The myosin...

The cell membrane consists of a double layer of phospholipids, with proteins floating in it. Phospholipids are a type of molecule with a phosphate head, and fatty tails, which form a double layer around t...

The way a simple virus invades a cell is with double stranded DNA replication. The virus has a coat of protein covering the DNA, once bound to the side of the cell the virus releases the DNA where it is t...