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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
Exam Preparation Guide

How to prepare for PPSC

PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
161
Biology Easy

What is the site of protein synthesis in a cell?

  • ARibosome
  • BNucleus
  • CMitochondria
  • DGolgi apparatus
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Correct Answer: Option A — Ribosome
Explanation: Ribosomes are the cellular organelles responsible for protein synthesis where mRNA sequences are translated into chains of amino acids following the genetic code during translation.
Submitted by: PaperMCQs
162
Biology Medium

What is the process by which cells engulf large particles by wrapping the cell membrane around them?

  • APhagocytosis
  • BOsmosis
  • CDiffusion
  • DPinocytosis
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Correct Answer: Option A — Phagocytosis
Explanation: Phagocytosis is a type of endocytosis where the cell membrane wraps around large solid particles such as bacteria and engulfs them forming a phagosome inside the cell.
Submitted by: PaperMCQs
163
Biology Medium

Which molecule is the primary energy currency of cells?

  • AATP
  • BADP
  • CNAD
  • DNADP
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Correct Answer: Option A — ATP
Explanation: ATP or adenosine triphosphate is the primary energy currency of cells storing and providing energy for all cellular processes including metabolism movement and biosynthesis.
Submitted by: PaperMCQs
164
Biology Medium

What is the term for two different alleles for a trait in an organism?

  • AHomozygous
  • BCodominant
  • CDominant
  • DHeterozygous
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Correct Answer: Option D — Heterozygous
Explanation: Heterozygous describes an organism that has two different alleles for a particular gene one dominant and one recessive with the dominant allele typically expressed in the phenotype.
Submitted by: PaperMCQs
165
Biology Medium

What is the term for two identical alleles for a trait in an organism?

  • AHomozygous
  • BHeterozygous
  • CCarrier
  • DCodominant
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Correct Answer: Option A — Homozygous
Explanation: Homozygous describes an organism that has two identical alleles for a particular gene either both dominant or both recessive determining the trait expressed in the phenotype.
Submitted by: PaperMCQs
166
Biology Medium

What is the term for an organism that carries a recessive allele but does not show the trait?

  • ADominant
  • BCarrier
  • CHomozygous
  • DHeterozygous
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Correct Answer: Option B — Carrier
Explanation: A carrier is an organism that is heterozygous for a recessive allele meaning it carries one dominant and one recessive allele and does not express the recessive trait but can pass it to offspring.
Submitted by: PaperMCQs
167
Biology Medium

What is the term for a permanent change in the DNA sequence of an organism?

  • AMutation
  • BAdaptation
  • CVariation
  • DAllele
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Correct Answer: Option A — Mutation
Explanation: A mutation is a permanent change in the DNA sequence of an organism that can alter gene function and may be inherited by offspring potentially causing genetic disorders or driving evolution.
Submitted by: PaperMCQs
168
Biology Medium

Which process converts mRNA information into a protein sequence at ribosomes?

  • ATranscription
  • BTranslation
  • CReplication
  • DTransduction
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Correct Answer: Option B — Translation
Explanation: Translation is the process by which ribosomes read the mRNA sequence and assemble amino acids in the correct order to synthesise a specific protein using tRNA molecules.
Submitted by: PaperMCQs
169
Biology Medium

Which process copies DNA information into mRNA in the nucleus?

  • ATranslation
  • BReplication
  • CTransduction
  • DTranscription
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Correct Answer: Option D — Transcription
Explanation: Transcription is the process by which the information in a DNA sequence is copied into mRNA by the enzyme RNA polymerase taking place in the nucleus of eukaryotic cells.
Submitted by: PaperMCQs
170
Biology Medium

Which molecule carries genetic information from DNA to ribosomes for protein synthesis?

  • AmRNA
  • BtRNA
  • CrRNA
  • DsnRNA
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Correct Answer: Option A — mRNA
Explanation: Messenger RNA or mRNA carries the genetic code from DNA in the nucleus to ribosomes in the cytoplasm where it serves as a template for protein synthesis through translation.
Submitted by: PaperMCQs
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