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Light harvesting complexes(LHC) are made...

Light harvesting complexes(LHC) are made up of hundreds of pipgment molecules bound to protiens. In LHC reaction centre is formed by

A

A single chlorophyll a molecule

B

All the pigments except the one molecule of chlorophyll a

C

Carotenoids and xanthophylls

D

Both B and C

Text Solution

Verified by Experts

The correct Answer is:
A
Light harvesting complexes (LHC) are made up of hundreds of pigment molecules bound to proteins. In LHC, reaction centre is formed by a single chlorophyll a molecule.
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The chlorophyll 'a' molecule forms the 'reaction centre' in photosystem

State whether the following statements are true or false. a. D and L stereoisomers are enantiomers. b. D enantiomer rotates the plane-polarised light to the right and L enantiomer to the left. c. Conversion of an erythro to a threo stereoisomer always occur by inversion at one chiral C . d. A racemate can be distinguished from a meso or a chiral compound by an attempted resolution. e. Racemisation of an enantiomer can only occure by breaking of at least one bond to the chiral centre. f. A reaction catalysed by an enzyme always gives an O.A product. g. When an achiral molecule reacts to give achiral molecule, the product is always racemic h. In chemical reactions, the change from an S reactant to an R product always signals an inversion of configuraion. i. An optically inactive substance must be achiral. j. An achiral compound can have chiral centres. K. A compound with S configuration is the (-) enantiomer.

Knowledge Check

  • The light harvesting complex (LHC) is made up of -

    A
    one molecule of Chl a
    B
    very few molecules of Chl a
    C
    hundreds of pigment molecules bound to proteins
    D
    Chl a + Chl c + protein + DNA

  • Read the following statements and choose ones- (A) Carotenoids protect chlorophyll a from photooxidation, (B) Dark reactions are not directly light driven, ©Chlorophyll a molecule shows maximum absorption in red and blue regions of the visible spectrum of light, (D) Light harvesting complexes are composed of hundreds of pigment molecules bound to lipids only.

    A
    A,B &C
    B
    B,D &C
    C
    A,C &D
    D
    D,B &A

  • Read the following statements and choose the correct ones. A. Carotenoids protect chlorophyll a from photo-oxidation. B. Dark reactions are not directly light driven. C. Chlorophyll a molecule shows maximum absorption in red and blue regions of the visible spectrum of light. D. Light harvesting complexes are composed of hundreds of pigment molecules bound to lipids only

    A
    A, B & C
    B
    B, D & C
    C
    A, C & D
    D
    D, B & A

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