Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Biomolecules question

2022 · 29 Jul · Shift 2 · Q14
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Biomolecules
  5. /2022 · 29 Jul · Shift 2 · Q14

Biomolecules question

2022 · 29 Jul · Shift 2 · Q14

JEE MainChemistryBiomoleculesMCQ+4 / −1
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amylose is insoluble in water. Reason R: Amylose is a long linear molecule with more than 200 glucose units. In the light of the above statements, choose the correct answer from the options given below.
  1. A
    Both A\mathbf{A}A and R\mathbf{R}R are correct and R\mathbf{R}R is the correct explanation of A\mathbf{A}A.
  2. B
    Both A\mathbf{A}A and R\mathbf{R}R are correct but R\mathbf{R}R is NOT the correct explanation of A\mathbf{A}A.
  3. C
    A\mathbf{A}A is correct but R\mathbf{R}R is not correct
  4. D
    A\mathbf{A}A is not correct but R\mathbf{R}R is correct.
View written solutionFree

Correct answer: D

  1. Identify the facts about amylose

    Amylose is a component of starch. It is:

    • a linear polymer of α\alphaα-D-glucose,
    • connected mainly by α(1→4)\alpha(1\to 4)α(1→4) glycosidic bonds,
    • typically contains a large number of glucose units (often more than 200).

    So the Reason R is correct.

  2. Check Assertion A

    Assertion A says: Amylose is insoluble in water.

    This is not correct as stated in standard biomolecules chemistry. Amylose is considered the water-soluble component of starch (at least compared with amylopectin, which is insoluble in water).

    Therefore, Assertion A is false.

  3. Check the relationship between A and R

    Since:

    • AAA is false,
    • RRR is true,

    the correct option is:

    D\boxed{\text{D}}D​

    which states: A is not correct but R is correct.

  4. Compare with stored correct answer

    Stored correct answer = D.

    My derived answer also = D. So they agree.

PreviousNext

More from Biomolecules

  • C6​H12​O6​ Zymase​ A Δ⟶NaOI​ B + CHI3​ The number of carbon atoms present in the product B is ​.2022 · Numerical
  • Sugar moiety in DNA and RNA molecules respectively are2022 · MCQ
  • The structure of protein that is unaffected by heating is2022 · MCQ
  • The sugar produced after complete hydrolysis of DNA is2022 · MCQ
  • A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have ​ peptide linkages.2021 · Numerical
  • Which among the following pairs of Vitamins is stored in our body relatively for longer duration?2021 · MCQ
  • The secondary structure of protein is stabilised by:2021 · MCQ
  • Which of the following is correct structure of tyrosine?2021 · MCQ