Questions & 100% Correct Detailed Answers Graded A+
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1. Which structure is responsible for controlling cell activities?
A. Ribosome
B. Nucleus
C. Golgi apparatus
D. Mitochondria
Answer: B. The nucleus contains DNA and regulates all cellular functions.
2. What is the basic unit of life?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cells are the smallest unit capable of independent life.
3. Which organelle produces ATP?
A. Nucleus
B. Ribosome
C. Mitochondria
D. Lysosome
Answer: C. Mitochondria generate energy through cellular respiration.
4. What is the function of ribosomes?
A. Lipid synthesis
B. Protein synthesis
C. DNA storage
D. Waste breakdown
Answer: B. Ribosomes assemble proteins from amino acids.
,5. Which biomolecule stores genetic information?
A. Lipids
B. Carbohydrates
C. DNA
D. Proteins
Answer: C. DNA carries hereditary genetic instructions.
6. What is the main function of the cell membrane?
A. Energy production
B. Protein synthesis
C. Selective permeability
D. DNA replication
Answer: C. It regulates what enters and exits the cell.
7. Which process moves water across a membrane?
A. Diffusion
B. Osmosis
C. Active transport
D. Endocytosis
Answer: B. Osmosis is the movement of water across a semipermeable
membrane.
8. What type of transport requires energy?
A. Passive transport
B. Diffusion
C. Active transport
D. Osmosis
Answer: C. Active transport uses ATP to move substances.
9. What is the role of chloroplasts?
A. Cellular respiration
B. Photosynthesis
C. Protein synthesis
D. Waste removal
Answer: B. Chloroplasts convert light energy into glucose.
,10. Which molecule is the main energy currency of the cell?
A. DNA
B. ATP
C. Glucose
D. RNA
Answer: B. ATP provides immediate energy for cellular processes.
11. What is the function of lysosomes?
A. Protein synthesis
B. Digestion of waste
C. Energy production
D. DNA storage
Answer: B. Lysosomes break down cellular waste.
12. What is the primary function of the Golgi apparatus?
A. Protein synthesis
B. Packaging and shipping proteins
C. Energy production
D. DNA replication
Answer: B. It modifies and packages proteins for transport.
13. Which macromolecule is made of amino acids?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Answer: B. Proteins are polymers of amino acids.
14. What is the function of carbohydrates?
A. Genetic storage
B. Energy source
C. Hormone production
D. Enzyme structure
Answer: B. Carbohydrates provide quick energy.
, 15. What is the main function of DNA?
A. Energy storage
B. Protein synthesis
C. Genetic information storage
D. Lipid transport
Answer: C. DNA stores genetic instructions.
16. Which process produces gametes?
A. Mitosis
B. Meiosis
C. Binary fission
D. Budding
Answer: B. Meiosis produces reproductive cells with half the chromosome
number.
17. What is mitosis?
A. Cell division for reproduction
B. Cell division for growth and repair
C. DNA mutation
D. Protein synthesis
Answer: B. Mitosis produces identical body cells.
18. Which phase of mitosis separates chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Answer: C. Anaphase separates sister chromatids.
19. What is a gene?
A. A type of protein
B. A segment of DNA coding for traits
C. A lipid molecule
D. A cell organelle
Answer: B. Genes are DNA segments that code for proteins.