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Choose the correct statement.
A. DNA is chemically more reactive and structurally stable compared to RNA.
B. Catalytic RNA is known as ribozymes.
C. DNA can directly code for the synthesis of protein, whereas RNA is dependent on DNA for protein synthesis.
D. Presence of 5-methyl uracil in the DNA confers stability.
The correct answer is:
(a)
(b)
(c)
(d)

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Important Questions on Chemical Constituents of Living Cell
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A) Catalytic RNA
B) Non-Protein enzymes
C) Nucleic acids
D) Group of ribosomes

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Identify the labelled parts in the concept of activation energy shown in the below diagram?

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Study the following
(I) | value | Affinity of the enzyme | Inverse measure enzyme affinity |
(II) | Hydrolases | bonds | Linking compounds |
(III) | Transferases | Transfer of a group | Inhibitor of reaction |
(IV) | Emil Fisher | Lock and key hypothesis | Formation of ES complex |
The correct combinations are

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Match the following?
Enzymes | Functions | ||
(a) | Lyases | (i) | Oxido reduction |
(b) | Isomerases | (ii) | Link compounds |
(c) | Dehydrogenases | (iii) | Transfer of group |
(d) | Ligases | (iv) | Interconversion |
(v) | Removal of groups |

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