10488+ MCQ Questions in english

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10488+ MCQ Questions in english हिन्दी

5672. Which structure controls the passage of substances into and out of the cell?

A. Cytoplasm

B. Plasma membrane

C. Nucleus

D. Ribosome

5671. Which of the following terms describes the entire set of genes in an organism?

A. Genotype

B. Phenotype

C. Genome

D. Allele

5670. What is the major cause of the greenhouse effect?

A. Destruction of the ozone layer

B. Increased carbon dioxide in the atmosphere

C. The decline in sunlight entering Earth

D. Increased forest clearing

5669. Which of the following is an example of an ecosystem?

A. A forest

B. A tree

C. A group of birds

D. A patch of soil

5668. What does the enzyme DNA polymerase do during DNA replication?

A. Unwind the double helix

B. Add nucleotides to the growing DNA strand

C. Join Okazaki fragments

D. Separate the DNA strands

5667. Which of the following molecules is directly involved in the synthesis of proteins?

A. tRNA

B. DNA

C. mRNA

D. Both A and C

5666. Osmosis brings about the entry of water into the cell through what type of solution, thereby making the cell swell?

A. Isotonic

B. Hypotonic

C. Hypertonic

D. None of the above

5665. Which of the following best describes a codon?

A. A segment of DNA that codes for a protein

B. A three-nucleotide sequence in mRNA that specifies an amino acid

C. A segment of RNA that carries amino acids to the ribosome

D. A molecule that catalyzes protein synthesis

5664. Which of the following describes a cell that is considered "haploid"?

A. Two sets of chromosomes

B. One set of chromosomes

C. No chromosomes

D. Four sets of chromosomes

5663. At which stage of meiosis does crossing over occur?

A. Prophase I

B. Metaphase I

C. Anaphase II

D. Telophase II

5662. What is the function of a ribosome in a cell?

A. It provides genetic information

B. It assists in protein synthesis

C. It generates ATP

D. It stores energy

5661. Which of the following can be classified as a by-product of fermentation?

A. Oxygen

B. Lactic acid

C. Water

D. Carbon dioxide and glucose

5660. Which of the following is NOT true about RNA?

A. RNA is single-stranded

B. RNA uses uracil instead of thymine

C. RNA contains deoxyribose sugar

D. RNA is used in protein synthesis

5659. In the scientific name Homo sapiens, "Homo" represents the:

A. Species

B. Kingdom

C. Family

D. Genus

5658. Which of the following statements is true regarding asexual reproduction?

A. It requires two parent organisms

B. Offspring are genetically identical to the parent

C. It involves the fusion of gametes

D. It results in genetic diversity

5657. What is the basic structural unit of the kidney?

A. Neuron

B. Hepatocyte

C. Alveolus

D. Nephron

5656. Which of the following is the process by which a cell divides to form two identical daughter cells?

A. Meiosis

B. Mitosis

C. Binary fission

D. Cytokinesis

5655. In which part of the chloroplast does the light-dependent reaction of photosynthesis take place?

A. Stroma

B. Outer membrane

C. Thylakoid membrane

D. Grana

5654. Which of the following is NOT a component of the cytoskeleton?

A. Microtubules

B. Actin filaments

C. Intermediate filaments

D. Ribosomes

5653. Which of the following is an example of a genetic disorder caused by a single gene mutation?

A. Down syndrome

B. Sickle cell anemia

C. Cystic fibrosis

D. Both B and C

5652. Which is the net result of glycolysis?

A. Glucose

B. ATP

C. Oxygen

D. Pyruvate

5651. Which of the following describes the outcome of meiosis in an animal cell?

A. Production of two identical cells

B. Production of two diverse cells

C. Production of four diverse gametes

D. Production of four identical gametes

5650. What is a nucleotide composed of?

A. A phosphate group, a sugar, and a nitrogenous base

B. A sugar, a fatty acid, and a phosphate group

C. A sugar, an amino acid, and a phosphate group

D. A nitrogenous base, a lipid, and a sugar

5649. Which enzyme performs its action in the process of transcription?

A. It produces RNA using DNA as its template

B. It links the amino acids into a protein

C. It creates DNA

D. It opens up the double helix structure of DNA

5648. Which organelle performs the function of producing energy?

A. Nucleus

B. Mitochondria

C. Golgi apparatus

D. Endoplasmic reticulum

5647. What is the role of tRNA in translation?

A. It synthesizes the mRNA strand

B. It carries amino acids to the ribosome

C. It assembles the ribosome

D. It transcribes DNA into RNA

5646. Which of the following is NOT a characteristic of all living organisms?

A. Ability to reproduce

B. Presence of a nucleus

C. Ability to respond to stimuli

D. Ability to evolve over generations

5645. What is the primary function of the rough endoplasmic reticulum (RER)?

A. Lipid synthesis

B. Protein synthesis and folding

C. Detoxification of harmful substances

D. Storage of calcium ions

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