PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
on the outside edge of the thylakoid-outer membrane
|
|
|
in the inner thylakoid space
|
|
|
in the thylakoid membrane
|
|
|
this is a trick question they are not in a thylakoid
|
Detailed explanation-1: -Photosystems are found in the thylakoid membranes of plants, algae, and cyanobacteria. These membranes are located inside the chloroplasts of plants and algae, and in the cytoplasmic membrane of photosynthetic bacteria. There are two kinds of photosystems: PSI and PSII.
Detailed explanation-2: -The thylakoid membrane contains a series of embedded pigments and proteins that are essential to perform the light-dependent reactions of photosynthesis. In order, these are Photosystem II, plastoquinone, cytochrome b6f, plastocyanin, Photosystem I, ferredoxin, and NADP+ reductase.
Detailed explanation-3: -Physically, photosystems are found in the thylakoid membranes. There are two kinds of photosystems: photosystem I (PSI) and photosystem II (PSII) (Fig. 3.3). PSII acts first during the light transformation process in photosynthesis, but it was named PSII because it was discovered second.
Detailed explanation-4: -Photosystem II (PSII) is a multi-subunit pigment-protein complex found in thylakoid membranes of oxygenic photosynthetic organisms, including cyanobacteria, algae, and plants (Nickelsen and Rengstl, 2013; Järvi et al., 2015). Driven by light, PSII catalyzes electron transfer from water to plastoquinone.
Detailed explanation-5: -Within chloroplasts, photosystems I and II carry out the initial steps in photosynthesis by harvesting light energy and converting it to chemical energy. These photosystems are composed of protein subunits, chlorophyll, and cofactors.