Enzymes and Inorganic Catalysts

Q.

Describe the important properties of enzymes.

Q. Read the following statements on lipids and find out correct set of statements:

(a) Lecithin found in the plasma membrane is a glycolipid

(b) Saturated fatty acids possess one
or more $C=C$ bonds

(c) Gingelly oil has lower melting point, hence remains as oil in winter

(d) Lipids are generally insoluble in water but soluble in some organic solvents

(e) When fatty acid is esterified with glycerol, monoglycerides are formed

Choose the correct answer from the options given below:

1. (a), (d) and (e) only
2. (a), (b) and (c) only
3. (a), (b) and (d) only
4. (c), (d) and (e) only

Q. What is the function of enzymes?

Q.

Carboxypeptidase requires which of the following elements for its activity?

1. Zinc

2. Niacin

3. Iron

4. Copper

Q.

What is an enzyme?

Q. The most abundant enzyme on earth is _______.

1. Catalase
2. Rubisco
3. Nitrogenase
4. Invertase

Q. The most abundant enzyme in the biosphere is

1. collagen
2. RuBisCO
3. trypsin
4. insulin

Q.

What are the enzymes six characteristics?

Q.

Which cell organelle is responsible for autolysis of cells?

Q.

Do enzyme increases activation energy?

Q. Lysosome enzymes are active at pH

1. 5
2. 7
3. 8
4. variable

Q.

A cell organelle that is exceptionally rich in hydrolytic enzymes is:

1. Ribosome

2. Endoplasmic Reticulum

3. Lysosome

4. Mitochondria

Q.

The discovery of enzymes is credited to ______ and happened during the study of the action of yeast extract on maize starch.

1. Bloor

2. Mulder

3. Eduard Buchner

4. Liebig

Q. The statement "All biological catalysts are proteins" is no longer valid after the discovery of

1. Ribonuclease
2. Ribozyme
3. RNAs
4. DNAs

Q. Which of the following statements is correct?

1. Biocatalysts accelerate the rate of a given metabolic reaction
2. Biocatalysts are generally proteins
3. The composition of enzyme catalyst differ from inorganic catalyst
4. All of these

Q. Molecules functioning as biocatalysts in addition to protein enzymes are:

1. Polysaccharides
2. RNAs
3. Fatty acids
4. DNAs

Q.

If a catalyst slows down the rate of a chemical reaction, it is called a negative catalyst.

1. True
2. False

Q. Choose the incorrect statement:

1. Metabolic flux is the rate of turn over of molecules through a metabolic pathway
2. Metabolites are converted into each other in a series of linked reactions called metabolic pathways
3. Enzymes are organic catalysts that increase the speed of the reaction in biological systems
4. Ribozymes are proteinaceous in nature

Q. The movement of ions is called

1. a
2. b
3. c
4. d

Q.

Name a protein that functions as an enzyme.

Q. An organic substance bound to an enzyme and essential for its activity is called

1. holoenzyme
2. apoenzyme
3. isoenzyme
4. coenzyme

Q.

Expand the term ‘ORS’.

Q.

A catalyst has no effect on _________ and _______.

Q.

Assertion : Lysosomes have basic enzymes.
Reason : Lysosomes are called autophagosomes.

1. Both Assertion and Reason are correct and Reason is the
   correct explanation of Assertion.

2. Both Assertion and Reason are correct, but Reason is not
   the correct explanation of Assertion.

3. Assertion is correct but Reason is incorrect.

4. Assertion is incorrect but Reason is correct.

Q. Which of the following statement is correct?

1. Biocatalysts accelerate the rate of a given metabolic reaction
2. Biocatalysts are generally proteins
3. Enzyme catalysts differ from inorganic catalysts
4. All of the above

Q.

Entry of ions into cells is called

1. Outflux

2. Influx

3. Out flow

4. Inflow

Q. Most of the biochemical reactions differ from those occurring in the non-living world in

1. being spontaneous
2. being enzymatic
3. releasing energy
4. requiring energy

Q.

71. Which of the following enzymes is used to convert glucose into ethyl alcohol?

1. diastase

2. maltase

3. zymase

4. invertase

Q. Enzymes are polymers of

1. Inorganic phosphate.
2. Fatty acids
3. Amino acids
4. Hexose sugar

Q.

Is Rubisco an efficient enzyme?