Which of the following is true about the light reactions of photosynthesis? PSI

Question

Which of the following is true about the light reactions of photosynthesis? PSI is responsible for oxidation of water and PSII reduces NADP+ PSII is responsible for oxidation of water and PSI reduces NADP+ oxidation of cholorophyll in this scheme is driven by energy from light both a and c Both b and c The light reactions of photosynthesis: are opposite from the ETC because water is reduced rather than oxygen being reduced occur because of decreasing reduction potentials when comparing the electron carriers are found in the inner mitochondrial membrane cannot occur in the dark since light is required for electron excitation none of the above What is the role of the Fe-S cluster in Photosystem II? It only accepts protons from the previous earner in the Z-scheme It is a roadblock for protons and helps build up the pH gradient in the mitochondnon It results in buildup of protons in the thylakoid space ot the chloroplast It directly helps in the oxidation of water to form oxygen none of the above After the CO_2 fixation step photosynthesis, the production of glucose takes place via a process nearly identical to gluconeogenesis via glycolysis via the TCA cycle via the pentose phosphate pathway via glycogen biosynthesis Plants generate all of the energy they need for survival through photosynthesis and do not use glycolysis for ATP production. True False

Explanation / Answer

Which of the following is true about the light reactions of photosynthesis?
a.) PSII is responsible for oxidation of water and PSI reduces NADP+
b.) PSII is responsible for oxidation of water and PSI reduces NADPH
c.) oxidation of chlorophyll in this scheme is driven by energy from light--ASWER
d.) both a and c
e.) all are true

The light reactions of photosynthesis:
a.) are opposite from the ETC because water is oxidized rather than oxygen being reduced
b.) are a mixture of endergonic and exergonic reactions that require energy from light
c.) are found in the thylakoid membrane
d.) do not occur in the dark since light is required for electron excitation
e.) all of the above--------- ASWER

3
What is the role of the Fe-S cluster in Photosystem II?
a.) It only accepts protons from the previous carrier in the Z-scheme
b.) It is a roadblock for protons and helps build up the pH gradient in the mitochondrion
c.) It results in buildup of protons in the stroma of the chloroplast------- ASWER
d.) It helps in the oxidation of water to form oxygen
e.) none of the above

4
After the CO2 fixation step in photosynthesis, the production of glucose takes place:
a.) via a process nearly identical to gluconeogenesis------- ASWER
b.) via glycolysis
c.) via the TCA cycle
d.) via the pentose phosphate pathway
e.) via glycogen biosynthesis

5
Plants generate all of the energy they need for survival through photosynthesis and do not use glycolysis for ATP production.
a.) True
b.) False----- ASWER

EXPLANATION:

The light responses, otherwise called photolysis responses, change over vitality from the sun into substance vitality as NADPH and ATP. These responses must occur in the light and in chloroplasts of plants.

Chlorophyll, which is a light-retaining organelle in plant cells, is an exceptionally complex particle that works in conjunction with the metal magnesium. There are principally two sorts of chlorophyll: chlorophyll an and chlorophyll b. These chlorophyll particles assimilate light in the red and blue wavelengths, making the plants in which they are put away look green.

tHEY are light-engrossing buildings in the thylakoid films that are available in photosynthetic life forms. There are two sorts of photosystems: Photosystem I and Photosystem II. Each has one essential photochemical response focus (P700 or P680) and an arrangement of frill shades to retain extra light.

There is an exceptional atom called chlorophyll a P700, situated in photosystem I, which retains light best at 700 nanometers (nm). It additionally contains other frill shades. Another uncommon chlorophyll a particle in photosystem II is called chlorophyll a P680 on the grounds that it assimilates best at 680 nm. Photosystem II likewise contains chlorophyll b and other embellishment colors.

In photosystem I vitality is consumed by a couple of P700 chl a particles raising to an energized vitality level. From that point they pass onto FeS4, then onto ferrodoxin, lastly onto ferrodoxin-NADP reductase. After 2 electrons have diminished ferrodoxin-NADP reductase they are exchanged to NADP+ lessening it to NADPH and a H+

Photosystem II is the second photosystem to create in most higher autotrophs. It cooperates with Photosystem I to ingest enough vitality to the different the oxygen of a water particle from its e-. Recollect that this is the main portion of the photosynthesis half response :

2H2O - > O2 + 4e-+ 4H+.

Photosystem II contains chlorophyll an, and also up to half chlorophyll b. It presumably advanced later as a supplement to Photo I. It is expected to catch enough vitality to do the biosynthetic responses of the dull response. Its response focus is a particle called P680 which retains light maximally at 680 nm.

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