Practice MCQ For Govt Pharmacist Exam- Biochemistry UNIT I

Practice MCQ For Govt Pharmacist Exam, in this article we will solve, Practice MCQ on the UNIT I under the subject Biochemistry of second semester. Read following article for your reference.

Introduction To Biomolecules » PHARMACAREERS

Carbohydrates: Introduction, Classification, Chemical Nature And Biological Importance » PHARMACAREERS

Lipids: Classification, Chemical Nature And Biological Importance » PHARMACAREERS

Proteins: Classification, Structure, Chemical Nature And Biological Importance Of Proteins » PHARMACAREERS

Nucleic Acids: Structure, Classification And Biological Importance » PHARMACAREERS

Bioenergetics » PHARMACAREERS

Which biomolecule is the primary source of energy for most cells?

a) Protein

b) Carbohydrate

c) Lipid

d) Nucleic Acid

 

DNA and RNA are classified as:

a) Carbohydrates

b) Lipids

c) Nucleic Acids

d) Proteins

 

The building blocks of proteins are:

a) Monosaccharides

b) Fatty Acids

c) Amino Acids

d) Nucleotides

 

Which type of carbohydrate is used for structural support in plants?

a) Glucose

b) Fructose

c) Starch

d) Cellulose

 

Phospholipids are a type of lipid found in:

a) Cell membranes

b) Energy storage

c) Insulation

d) All of the above

 

The function of mRNA in protein synthesis is:

a) Store genetic information

b) Carry amino acids

c) Copy genetic information

d) Provide instructions for protein assembly

 

The primary structure of a protein refers to:

a) The folding of the polypeptide chain

b) The sequence of amino acids

c) The 3D shape of the protein

d) The interaction with other molecules

 

Which amino acid has the simplest side chain?

a) Glycine

b) Tyrosine

c) Arginine

d) Tryptophan

 

Enzymes are biological catalysts made primarily of:

a) Carbohydrates

b) Lipids

c) Proteins

d) Nucleic Acids

 

The complementary pairing between adenine (A) and uracil (U) occurs in:

a) DNA-DNA bonding

b) DNA-RNA bonding

c) RNA-RNA bonding

d) All of the above

 

 

Which term refers to the usable energy available in a system for cellular processes?

a) Enthalpy (ΔH)

b) Entropy (ΔS)

c) Gibbs Free Energy (ΔG)

d) Redox Potential (E°)

 

A reaction with a negative ΔG is considered:

a) Endergonic and requires energy input

b) Endergonic and releases energy

c) Exergonic and requires energy input

d) Exergonic and releases energy

 

Which equation relates free energy change (ΔG) to enthalpy change (ΔH) and entropy change (ΔS) at constant temperature?

a) ΔG = ΔH – TΔS

b) ΔG = ΔH + TΔS

c) ΔS = ΔG / ΔH

d) ΔH = ΔG x TΔS

 

Entropy (ΔS) is a measure of:

a) Heat absorbed or released

b) Disorder or randomness in a system

c) Strength of chemical bonds

d) The rate of a reaction

 

In cellular respiration, the electron transport chain is an example of:

a) An endergonic reaction requiring ATP input

b) An endergonic reaction releasing energy

c) An exergonic reaction requiring ATP input

d) An exergonic reaction releasing energy through a series of redox reactions

 

A higher positive redox potential (E°) indicates:

a) A stronger tendency to lose electrons (reducing agent)

b) A weaker tendency to lose electrons (reducing agent)

c) A stronger tendency to gain electrons (oxidizing agent)

d) A weaker tendency to gain electrons (oxidizing agent)

 

Standard hydrogen electrode (SHE) has a defined redox potential of:

a) 0 V

b) +1.0 V

c) -0.1 V

d) It varies depending on the reaction

 

The movement of electrons in redox reactions is directly coupled to:

a) ATP synthesis

b) Protein synthesis

c) DNA replication

d) All of the above (depending on the cellular process)

 

Which molecule readily accepts electrons and protons in the electron transport chain?

a) Oxygen (O2)

b) Carbon dioxide (CO2)

c) Glucose (C6H12O6)

d) Water (H2O)

 

Coupling exergonic reactions to endergonic reactions in a cell allows for:

a) Increased entropy

b) Violation of the second law of thermodynamics

c) Overall energy transfer and cellular work

d) Spontaneous conversion of all energy into usable forms

 

Energy-rich compounds are characterized by the presence of:

a) Strong covalent bonds

b) Weak phosphodiester bonds

c) High-energy phosphate bonds

d) Peptide linkages

 

Which of the following is NOT a common classification of high-energy compounds?

a) Pyrophosphates

b) Acyl phosphates

c) Carbohydrates

d) Guanido phosphates

 

The biological significance of ATP lies in its ability to:

a) Store genetic information

b) Provide energy for cellular processes

c) Transport molecules across membranes

d) Act as a structural component of cells

 

Cyclic AMP (cAMP) is derived from:

a) Glucose

b) ATP

c) Amino acids

d) Nucleic acids

 

The primary function of cAMP in cells is:

a) Energy storage

b) Cellular signaling

c) Enzyme activation

d) All of the above (depending on the cellular context)

 

The hydrolysis of ATP releases approximately how much free energy?

a) -2 kcal/mol

b) -7.3 kcal/mol

c) -14.6 kcal/mol

d) -20 kcal/mol

 

Compared to ATP, cAMP has:

a) Higher energy content

b) Lower energy content

c) Identical energy content

d) No energy-storing ability

 

The breakdown of glucose through cellular respiration ultimately leads to the production of:

a) Only ATP

b) Only cAMP

c) Both ATP and cAMP

d) Neither ATP nor cAMP directly

 

Which of the following statements about ATP is INCORRECT?

a) It is the “universal currency” of cellular energy transfer.

b) It can be recycled through cellular respiration.

c) Its hydrolysis is an endergonic reaction.

d) It provides energy for a variety of cellular processes.

 

Mutations in enzymes involved in cAMP signaling can lead to:

a) Increased ATP production

b) Disrupted cellular communication

c) Enhanced protein synthesis

d) None of the above

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