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
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Nucleic Acids: Structure, Classification And Biological Importance » 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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