All Free Biology MCQs with Answers

• A. Amitosis
• B. Mitosis
• C. Meiosis I
• D. Meiosis II

Explanation: Meiosis is a type of cell division that occurs in the reproductive cells of eukaryotic organisms.

• A. Zygotene
• B. Pachytene
• C. Diplotene
• D. Diakinesis

Explanation: During diakinesis, the condensation of chromosomes is maximum.During this stage, the homologous chromosomes become tightly coiled and…

• A. Anaphase I
• B. Anaphase II
• C. Metaphase II
• D. Both A and B

Explanation: In anaphase II, the centromeres separate and the sister chromatids-now individual chromosomes-move toward the opposite poles of the cell.

• A. G0
• B. G1
• C. G2
• D. S

Explanation: G0 phase: This phase is a resting phase of the cell cycle. Cells in G0 are not dividing, but they are still metabolically active.

• A. DNA replication
• B. Mutations
• C. Translation
• D. Transcription

Explanation: Option A: DNA replication is the process by which DNA is copied in preparation for cell division.

• A. 1, 2, 4, 3
• B. 2, 3, 1, 4
• C. 3, 4, 1, 2
• D. 3, 4, 2, 1

Explanation: Mitosis has four stages: prophase, metaphase, anaphase, and telophase. Mitosis, a process of cell duplication, or reproduction, during…

• A. Nerve cells
• B. Cells of cornea
• C. Cells of lens
• D. None of these

Explanation: Cells of the cornea of the eye do not enter G0 phase. Whereas, nerve cells and cells of the lens remain in G0 phase for the life span of…

• A. X chromosomes
• B. Y chromosomes
• C. Sex chromosomes
• D. Autosomes

Explanation: Twenty-two of these pairs, called autosomes, look the same in both males and females.

• A. Genes
• B. Ribosomes
• C. DNA
• D. Chromatin

Explanation: Chromatin are loosely coiled fibres of DNA and histone proteins present in the nucleus.

• A. Satellite
• B. Kinetochore
• C. Nucleolar organizer
• D. Telomeres

Explanation: A telomere is a region of repetitive nucleotide sequences at each end of a chromatid, which protects the end of the chromosome from…

• A. Linkage
• B. Synapsis
• C. Pairing
• D. Crossing over

Explanation: During meiosis, homologous chromosomes come together and form pairs through a process called "synapsis." The synapsis involves the…

• A. Prophase
• B. Interphase
• C. Anaphase
• D. Telophase

Explanation: The DNA content of the cell doubles during S-phase that probably occurs during interphase of cell cycle.

• A. Diploid cells
• B. Polyploid cells
• C. Both A and B
• D. None of these

Explanation: In diploid and polyploid cells, more than one complete cells of chromosomes are present so homologous chromosomes can be formed.

• A. Option A
• B. Option B
• C. Option C
• D. Option D
• E. Option E

Explanation: Explanation for this question will be added soon.

• A. Species
• B. Domain
• C. Kingdom
• D. Diversity

Explanation: Species is defined as a group of organisms capable of interbreeding and creating fertile offspring.

• A. Similar genera in one family
• B. Similar species in one genus
• C. Similar familes in one order
• D. All of above

Explanation: Linnaean classification indeed involved grouping organisms hierarchically based on similarities, encompassing similar species in one…

• A. Amino acids
• B. Nucleotides
• C. Citric acids
• D. Isoprenoid units

Explanation: b) Nucleotides:This is the correct answer. Nucleic acids, such as DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are made up of…

• A. Structure of cells
• B. Enzymatic function
• C. Metabolic function
• D. Both A and B

Explanation: Option D is correct since it includes both A and B which are right. The insoluble nature of large organic molecules means that it is…

• A. Combining of molecules due to reaction with hydrogen
• B. Combining of molecules due to reaction with water
• C. Breaking of molecules due to reaction with water
• D. Breaking of molecules due to reaction with hydrogen

Explanation: The 'lysis' in hydrolysis means splitting. It is the splitting of molecule using water.

• A. Carbon dioxide
• B. Water
• C. Lipid
• D. Hydrochloric acid

Explanation: Fats, nucleic acids, carbohydrates, enzymes, proteins, and hydrocarbon fuels are examples of organic molecules.