Project #57717 - Bio 175 words and two 75 words reply

Budget 25$

(200 words)

Photosynthesis consists of two basic steps - The Light Dependent Reactions and The Light Independent Reactions (Calvin Cycle).  Please describe the items needed for each step to occur and the items produced from each step.

Your post is worth 10 points.  Full credit will be given to complete answers that demonstrate an understanding of the answer.  You are also required to respond to at least one fellow student in a meaningful way for 5 points.  Simply complementing them on their work is not worth points.  You need discuss a relevant portion of their post... in other words start a discussion on the subject.

 

Reply this two article:

1.

Photosynthesis consists of two basic steps: the Light Dependent Reactions and the Light Independent Reactions (Calvin Cycle).

1. The essential items in Light Dependent Reaction are: sunlight, water, pigments (chlorophyll), NADP, ADP and inorganic phosphate. The Light Dependent Reactions produce ATP and NADPH.

In the light-dependent reaction, light hits the chloroplast, which then absorbs light and traps it. Pigments (Chlorophyll) channel the light down to a reaction center. An electron at the reaction center is excited to a higher energy level, and is received by an electron acceptor. This electron is taken from the splitting of water. The electron is passed along a series of electron carriers. It is moving down energy levels and losing energy. This energy causes the pumping of hydrogen from the cytoplasm of chlorophyll into thylakoid spaces inside the grana. The hydrogen diffuses and flows back into the cytoplasm through protein channels. As the hydrogen diffuses down a concentration gradient, ATP is made from ADP and inorganic phosphate. Eventually, the electron is used to reduce NADP to NADPH along with hydrogen from photolysis.

2. The Light Independent Reaction (Calvin Cycle) needs CO2, ATP, and NADPH. The Calvin Cycle produces glucose.

Light-independent reactions take place in plant chloroplasts. In this process sugar are made from 5 carbon atoms (Ribulose Biphosphate) combines with carbon dioxide to form a 6-carbon sugar (Phosphoglycerate). Phosphoglycerate is reduced with hydrogen atoms from the light-dependent reaction to form 2 molecules of triose phosphate. By using ATP, some triose phosphate is converted back into Ribulose Biphosphate. The rest left over is used to produce glucose.

 

 

 

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