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When the muscle is relaxed, tropomyosin fibres wrap around the actin filament, covering up the sites at which myosin can bind with actin.

During muscle contraction, Ca2+ ions bind to troponin compl...

1. Helicase unwinds the DNA double helix strucutre

2. This is done by breaking the hydrogen bonds

3. Only one strand is then used as ...

Scientists have categoried all life on Earth into three 'domains'. These are: eukarya, bacteria and archaea. The domains bacteria and archaea both contain prokaroytes. Because these groups have experience...

When the plant cells are placed in the salt solution, there is a higher concentration of water molecules in the cell and a lower concentration of water in the salt solution and thus a concentration gradie...

aerobic respiration uses oxygen for eaxaplme a relaxed human will be inhaling oxygen and their bodies using it to break down glucose in their cells.  glucose + oxygen = carbon dioxide + water

Howev...