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Biology 1525 MCQs [All-Courses]

Biology covers key concepts of life, organisms, and human systems with exam-focused notes for PPSC, FPSC, KPPSC, BPSC.,NTS, OTS, AJKPSC. Clear, concise topics help students prepare effectively for competitive tests.

Optimal temperature of enzymes present in human body is_____________?

A 27?C

B 37?C

C 47?C

D 30?C

Review Detailed Answer

Correct Answer: 37?C

A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?

A Co-enzyme

B Blocker

C Inhibitor

D Cofactor

Review Detailed Answer

Correct Answer: Inhibitor

A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?

A Irreversible inhibitor

B Reversible inhibitor

C Competitive inhibitor

D Non-competitive inhibitor

Review Detailed Answer

Correct Answer: Competitive inhibitor

Which of the statement about cell membrane is not true?

A It contains protein molecules embedded in lipid bilayer

B It is a differentially permeable membrane.

C It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.

D It may get infolded to engulf solid or liquid material.

Review Detailed Answer

Correct Answer: It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.

Inhibitors which block the enzyme by forming weak bond are called___________?

A Competitive inhibitors.

B Non-competitive inhibitors

C Irreversible inhibitors.

D Both a and b

Review Detailed Answer

Correct Answer: Both a and b

Magnifying power of electron microscope as compared to eye is____________?

A 500 X

B 250000X

C 500000X

D 250X

Review Detailed Answer

Correct Answer: 250000X

Malonic acid is an example of____________?

A Irreversible inhibitor

B Reversible inhibitor

C Competitive inhibitor

D Non-competitive inhibitor

Review Detailed Answer

Correct Answer: Competitive inhibitor

The structure of an enzyme is altered by____________?

A Irreversible inhibitor

B Reversible inhibitor

C Competitive inhibitor

D Non-competitive inhibitor

Review Detailed Answer

Correct Answer: Irreversible inhibitor

In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?

A Their physical properties like size & weight.

B Physical properties of the medium like its density.

C Their electrical properties like their charges

D Both a and b

Review Detailed Answer

Correct Answer: Both a and b

If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?

A increase in concentration of enzyme

B increase in concentration of substrate

C increase in pH

D increase in temperature

Review Detailed Answer

Correct Answer: increase in concentration of enzyme

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Biology 1525 MCQs [All-Courses]

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All Topics 1525

Optimal temperature of enzymes present in human body is_____________?

A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?

A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?

Which of the statement about cell membrane is not true?

Inhibitors which block the enzyme by forming weak bond are called___________?

Magnifying power of electron microscope as compared to eye is____________?

Malonic acid is an example of____________?

The structure of an enzyme is altered by____________?

In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?

If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?