Tag: enzymes

Quizzes (4) Questions (199)

Questions Related to enzymes

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

Tyloses

  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)
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

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 ___________.

  1. A B C D

    I III II V

  2. II I IV III

  3. IV I III I

  4. V III I II
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Matching the botanical features: Spongy aril is found in Nymphaea, multiple epidermis in Nerium, respiratory roots in Jussiaea, and root pockets in Pistia.

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

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

  1. enzyme occupies 6th position
    (a) Ligase

  2. Isomerase

  3. Lyase

  4. Hydrolase
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 
Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

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.

  1. Syntype

  2. Neotype

  3. Lectotype

  4. Paratype
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the International Code of Nomenclature, a neotype is a specimen selected as the nomenclatural type when all original material is lost or destroyed. A lectotype is chosen from original material when no holotype was designated.

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

Select the type of enzyme involved in the above reaction.

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

  1. Dehydrogenase

  2. Transferase

  3. Hydrolase

  4. Lyase

  5. Isomerase
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Who proposed the principle of "Induced fit"?

  1. Jacob

  2. Fischer

  3. Koshland

  4. Laderberg
Reveal answer Fill a bubble to check yourself
C Correct answer
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.