Tag: enzymes

Questions Related to enzymes

Tyloses

properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

  1. Are ballon-like swelling of xylem parenchyma cells in the lumen of vessels

  2. Are found in heartwood

  3. Make heartwood functional

  4. Both (A) and (B)

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Correct Option: A
Explanation:
Tyloses are outgrowths on parenchyma cells of xylem vessels of secondary heartwood. When the plant is stressed by drought or infection, tyloses will fall from the sides of the cells and "dam" up the vascular tissue to prevent further damage to the plant. 
So the correct option is 'Are ballon-like swelling of xylem parenchyma cells in the lumen of vessels'.

Select the incorrect match.

properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

  1. Dynein is an enzymatic protein

  2. Ribosomes are also called as organelle within organelle

  3. Minimum $0.01$M concentration of $Mg^{++}$ is required for structural formation of ribosome

  4. Peptidyl transferase enzyme ($23$ s-rRNA) helps in the formation of peptide bond during protein synthesis

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Correct Option: A

Study the following lists .

List-I List-I
(A) Spongy aril (I) Jussiaea
(B) Mulhple epidermis (II) Pistia
(C) Respirato room (III) Nerium
(D) Root pockets (IV) Sagiuaria
(V) Nymphaea


The correct match is ___________.

properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

  1. A B C D

    I III II V

  2. II I IV III

  3. IV I III I

  4. V III I II

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Correct Option: D

In the modern system of nomenclature which one of the following enzyme occupies 6th position _________________.

properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

  1. enzyme occupies 6th position
    (a) Ligase

  2. Isomerase

  3. Lyase

  4. Hydrolase

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Correct Option: A
Explanation:
According to the modern classification system, enzymes have been classified into six classes:
Class First is Oxidoreductases
Class Second is Transferases.
Class Third is Hydrolase.
Class Fourth is Lyase.
Class Fifth is Isomerase and
Class Sixth is Ligase.
Therefore A is the correct option. 

The nomenclatural type of a specimen selected by the author as substitute of a lost material on which the name of the taxon is base is called.

properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

  1. Syntype

  2. Neotype

  3. Lectotype

  4. Paratype

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Correct Option: A

A specimen or illustration used by the author or designated by him as the nomenclature type is called.

properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

  1. Isoparatype

  2. Isotype

  3. Syntype

  4. Holotype

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Correct Option: A

Which of the following is not a co-enzyme?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. NAD

  2. NADP

  3. FAD

  4. ATP

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Correct Option: D
Explanation:

ATP or adenosine triphosphate is a nucleotide. It is not a co-enzyme.

Select the type of enzyme involved in the above reaction.

$\boxed{S - G + S' \rightarrow S + S' - G}$

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Dehydrogenase

  2. Transferase

  3. Hydrolase

  4. Lyase

  5. Isomerase

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Correct Option: B
Explanation:

Transferases are the enzymes that catalyze group transfer reactions. In the figure, one group G has been transferred to another group S'. It is a classical example of a group transfer reaction.

Who proposed the principle of "Induced fit"?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Jacob

  2. Fischer

  3. Koshland

  4. Laderberg

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Correct Option: C
Explanation:

The induced-fit model is proposed by Daniel Koshland in 1958. It is the most accepted model for enzyme-substrate complex. It describes the formation of the Enzyme substrate as a result of the interaction between the substrate and a flexible active site which means exposure of an enzyme to a substrate causes the active site of the enzyme to change shape in order to allow the enzyme and substrate to bind. Hence option C is correct.

NADP is

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. A coenzyme

  2. A part of tRNA

  3. An enzyme

  4. A part of rRNA

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Correct Option: A
Explanation:

Coenzymes are organic cofactors which are required for enzymatic action of certain enzymes. NADP is a coenzyme form of vitamin nicotinamide or niacin.