☑️5 CSIR NET Life Sciences practice questions with answers (NET level – conceptual + MCQ style)
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🟡CSIR NET LIFE SCIENCES
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1. Cell Biology

Q1. Which organelle is primarily responsible for ATP production in eukaryotic cells?

A) Golgi apparatus
B) Lysosome
C) Mitochondria
D) Ribosome

✅ Answer: C) Mitochondria
Explanation: Mitochondria are called the “powerhouse of the cell” because they produce ATP through oxidative phosphorylation.

2. Genetics

Q2. According to Mendel’s law of segregation, alleles separate during:

A) DNA replication
B) Meiosis
C) Translation
D) Fertilization

✅ Answer: B) Meiosis
Explanation: During meiosis, homologous chromosomes separate, leading to segregation of alleles into gametes.

3. Biochemistry

Q3. Which enzyme is responsible for converting RNA from a DNA template?

A) DNA polymerase
B) Reverse transcriptase
C) RNA polymerase
D) Ligase

✅ Answer: C) RNA polymerase
Explanation: RNA polymerase synthesizes RNA during transcription using DNA as a template.

4. Ecology

Q4. The transfer of energy from one trophic level to another is approximately:

A) 1%
B) 10%
C) 50%
D) 90%

✅ Answer: B) 10%
Explanation: According to the 10% law of energy transfer, only about 10% of energy moves to the next trophic level.

5. Molecular Biology

Q5. The process of synthesizing protein from mRNA is called:

A) Replication
B) Transcription
C) Translation
D) Mutation

✅ Answer: C) Translation
Explanation: Translation occurs in ribosomes where mRNA is decoded to synthesize proteins.

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