Question
The activity of an enzyme is expressed in International Units (IU). However, the S.I. unit for enzyme activity is Katal. One Katal is
The correct answer is
$6 \times 10^7$ IU
Enzyme Activity Units: Katal vs. IU
Enzyme activity is commonly expressed in International Units (IU). However, the standard International System of Units (SI) unit for enzyme activity is the Katal (kat).
The relationship between Katal and IU is established as follows:
1 Katal is equivalent to $6 \times 10^7$ IU.
This conversion is a standard definition used in biochemistry and related fields.
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Important Questions from Enzyme Classification Catalytic and Regulatory Strategies
- Correctly match the Coenzyme with its respective involvement in a specific Reaction type.
Coenzyme Reaction type P. Thiamine pyrophosphate 1. Acyl group transfer Q. Tetrahydrofolate 2. Transfer of one carbon group R. Flavin adenine dinucleotide 3. Transfer of methyl group S. 5'-Deoxyadenosyl cobalamin 4. Oxidation-reduction 5. Aldehyde transfer - An enzyme catalyzes a reaction by
- Match the entries inGroup I with the enzymes inGroup II.
Group I Group II P. NAD$^+$ 1. Glutathione peroxidase Q. Selenium 2. Nitrogenase R. Pyridoxal phosphate 3. Lactate dehydrogenase S. Molybdenum 4. Glycogen phosphorylase Determine the correctness or otherwise of the following Assertion (a) and the Reason (r)
Assertion: A very low amount of inhibitor can act as an activator for allosteric enzymes.
Reason: Allosteric enzymes follow Michaelis-Menten kinetics.
- Correctly match the Enzyme with its respective Function.
Enzyme Function P. Gyrase 1. Removes a damaged base by cleaving the bond between sugar and base Q. Deadenylase 2. Provides a swivel allowing one DNA strand to rotate around the other R. Glycosylase 3. Catalyses bond formation between 3'-OH and 5'-phosphate end of nucleotides in duplex DNA S. DNA ligase 4. Is an exoribonuclease that removes the poly(A) tail
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