Photosynthesis : The Light-Dependent Reactions { 2 }

In the light-dependent stage, ___ energy is trapped by photosynthetic ___, ___. Its ___ occur ___ called ___ which are held in the ___ of the ___.

In each ___, several ___ ___ molecules plus ___ pigments ( ___ & ___ ) are arranged.

All these ___ ___ harvest ___ energy and funnel it to a ___ chlorophyll ___ of the ___; this is known as the ___ and different ___ around it absorb ___ energy of slightly differnt wavelengths.

There are two types of photosystem present in the ___ of the __ and these are photosystem I which has a reaction centre acivated by ___ of wavelength ___. Photosystem II has a reaction centre activated by __ of wavelength ___ and is referred to as ___; Photosystem I is known as ___.

Although they have specific and differing roles, ___ I and II occur ___ in the ___ of the __, along with specific ___ i.e. ___ & ___.

Although they have specific and differing roles, ___ I and II occur ___ in the ___ of the __, along with specific ___ i.e. ___ & ___.

Enzymes catalyse :

When ___ reaches the reaction centre, ___ of the key ___ molecule are ___ to an '___' state by the ___ energy received.

As a result, ___ energy ___ are released from this ___ molecule and bring about the ___ changes of the light ___ reactions, whilst the spaces vacated by them are continuously refilled by ___ or ___ ___.

First the ___ electrons from photosystem ___ are picked up and passed along a ___.

As these ___ electrons pass, some of the causes the pumping of ___ from the ___ ___ into the ___, where they accumulate causing the pH to ___.

The resulting ___ gradient created across the ___ ___ sustains teh synthesis of ___ and is another example of ___.

As a result of these energy transfers, the excitation level of the ___ ___ and they come to fill the vacancies in the ___ of photosystem __. Meanwhile the 'holes' in the ___ of photosystem __ are filled by ___ in their ___ state from ___ molecules.

The ___ charged '___' in photosystem __ are powerful enough to cause the splitting of ___ ( ___ ) in the presence of a specific ___, which then triggers release of ___ and ___ as well as ___.

The ___ atoms combine to form ___ -the ___ of photosynthesis; meanwhile the ___ ions are used in the ___ of ___.