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Why adenine always pairs with thymine an...

Why adenine always pairs with thymine and guanine with cytosine ?

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Adenine can form two hydrogen bond with thymine and Guanine forms three hydrogen bonds with cytosine.
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Adenine pairs with thymine through

(A) Adenine pairs up with thymine but not with cytosine. (R) With cytosine, no hydrogen bonds are possible for adenine.

(A) Thymine pairs with adenine whereas cytosine pairs with guanine in DNA molecule. (R) The hydrogen bonding between bases of two strands is highly specific.

Why rainbow always forms opposite to the sun ?

(A) Guanine unites with Cytosine but not with Thymine. (R) Guanine and Cytosine are purine bases while Thymine is a pyrimidine base.

The AT/GC ratio in human beings is (where A=adenine, T=thymine, G=guanine, C=cytosine)

Why is adsorption always exothermic?

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. Why adenine always pairs with thymine and guanine with cytosine ?

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  2. (A) Fructose has ketone group and does not reduce Tollen's reagent. ...

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  3. (A) All carbohydrates fit in the general formula Cx(H2O)y where x=y ...

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  4. (A) Glucose shows mutarotation (R) Glucose is in pyranose form and h...

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  5. (A) Sucrose is not a reducing sugar. (R) In sucrose, glucose is in p...

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  6. (A) When alpha-D glucose dissolved in water, specific rotation of the ...

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  7. (A) Fructose is the sweetest naturally occuring sugar. (R) Fructose...

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  8. (A) Cellulose is not digested by human beings. (R) Human beings are ...

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  9. (A) Hydrolysis of sucrose is called inversion of cane sugar. (R) Sucr...

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  10. (A) In a sucrose molecule, glucose is present in the furanose form and...

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  11. (A) Reducing sugars undergo mutarotion. (R) During mutarotation, one...

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  12. (A) Galactose is the C4 epimer of glucose. (R) Glucose and galacto...

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  13. (A) Sucrose is an example of reducing sugar. (R) Sucrose gives silve...

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  14. (A) Two different hexoses may give the same osazone. (R) Different H...

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  15. (A) alpha-D (+) Glucose and beta-D(+) - Glucose are enantiomers. (R)...

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  16. (A) Reduction of glucose with sodium borohydride gives sorbitol. (R)...

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  17. (A) Glucose and fructose give the same osazone. (R) Glucose and fruc...

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  18. (A): Fructose gives positive Tollen's test. (R) : Fructose is a Keto...

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  19. (A) Cane sugar undergoes inversion in aqueous solution. (R) Cane sug...

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  20. (A) C6 H(10) O5 is a carbohydrates. (R) Most of the carbohydrates ha...

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  21. (A) Lactose is a reducing sugar. (R) Lactose contains glucose and ga...

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