Question #1: Which of the following is NOT true about the light reactions ofphot

Question

Question #1:

Which of the following is NOT true about the light reactions ofphotosynthesis?

a.)there are two photosystems linked by an electron transportchain

b.)electron transport is coupled to production of ATP

c.)the production of NADPH is carried out by Photosystem I, whereasthe splitting of water is

carried out by Photosystem II

d.)O2 production is coupled to these reactions

e.)none of the above

Question #2:

Inphotosynthesis,

a.)The dark reactions take place in the outer mitochondrial membrane,whereas the light

reactions occur in the inner mitochondrial membrane

b.)The light reactions take place in the inner mitochondrial membrane,whereas the dark

reactions occur in the matrix

c.)The light reactions take place in the thylakoid membrane, whereasthe dark reactions occur

inthe stroma

d.)A pH gradient is established between the thylakoid space (high pH)and the stroma (low

pH).

e.)Both C and D

Question #3:

Whatis the role of the Fe-S cluster in Photosystem II?

a.)It accepts electrons from the preceding PSII component

b.)It results in protons from the preceding PSII component beingdumped into the thylakoid

space

c.)It is responsible for establishing a pH gradient between the matrixand inner mitochondrial

space

d.)both a and b

e.)both a and c

Question #4:

After the CO2 fixation step in photosynthesis, the production ofglucose takes place:

a.)via a process nearly identical to gluconeogenesis

b.)via glycolysis

c.)via the TCA cycle

d.)via the pentose phosphate pathway

e.)via glycogen biosynthesis

Question #5:

Plants rely on photosynthesis for the production of ATP and do notuse glycolysis.

a.)True

b.)False

Explanation / Answer

      1.) e.) none of the above.          This isbecause, The first option, the two photosystems are linked throughelectron transport chain is true.          PS-II and PS-I are linked through Plastoquinone, cytochrome complex andplastocyanin through electrons are          carried.          ETC iscoupled to ATP production, thats the reason it is known asPhotophosphorylation.          Thethird option is true NADPH is produced through PS-I and splittingof water is by PS-II.          Fourthoption productionof oxygen is coupled to these reactions,because oxygen is produced by PS-II when water          is split.          Allthese statements are true.          Hencethe option e is right.       2.) e.) both C and D.           This isbecause, photosynthesis is concerned with chloroplast and not withmitochondria.           So, thefirst and the second option can be ruled out.           Theleft over are 3 and 4; light reaction occurs in thylakoidmembraneTo be still clear it is in grana.           Dark reaction occurs in stroma.           These two options are true, hence option e is right.
      3.) a.) This is because, the Fe-Scluster in PS-II accepts electrons from the preceeding PS-IIcomponent.          PS-IIhas nothing to do with the protons, because photophosphorylationtakes place due to PS-I.Hence this option is          ruledout.          MitochondrialpH gradient has nothing to do with the photosynthesis. Hence thethird optionis also ruled out.          Basingon these the first option is right.
      4.) a.) via a process which is nearlyidentical to gluconeogenesis.          Glycolysis,TCA, Pentose phosphate pathways are degradative pathways whileglucose sysnthesis is constructive          process.          Hencethe option b and c are ruled out.          Once thesynthesis of glucose is over glycogen is synthesized so even thisoption is ruled out.                 5.) True.             Thisis because, plants donot do any physical energy.             Organismsthat do physical work require energy by different sources.             Asplants donot do this, for energy they rely on photosynthesis butnot on glycolysis.

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