EST2 HIGH SCHOOL BIOLOGY 🧬 Quick 20-Question Practice Post

EST2 HIGH SCHOOL BIOLOGY

🧬 Quick 20-Question Practice Post

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Directions: Choose the best answer for each question (A – E). Answers are provided below each question.

1. What is the basic unit of life?

A) Atom
B) Molecule
C) Cell
D) Tissue
E) Organ

Answer: C

2. Which organelle is known as the "powerhouse of the cell"?

A) Nucleus
B) Ribosome
C) Mitochondria
D) Golgi body
E) Endoplasmic reticulum

Answer: C

3. What is the function of the nucleus?

A) Protein synthesis
B) Energy production
C) Stores genetic material
D) Cell movement
E) Waste removal

Answer: C

4. Which process produces energy in the presence of oxygen?

A) Fermentation
B) Photosynthesis
C) Aerobic respiration
D) Anaerobic respiration
E) Transpiration

Answer: C

5. What is the chemical formula for glucose?

A) C₆H₁₂O₆
B) CO₂
C) H₂O
D) NaCl
E) C₂H₅OH

Answer: A

6. Which biomolecule is the primary source of energy for living organisms?

A) Proteins
B) Lipids
C) Carbohydrates
D) Nucleic acids
E) Vitamins

Answer: C

7. What is the process by which plants make their own food?

A) Respiration
B) Transpiration
C) Photosynthesis
D) Digestion
E) Osmosis

Answer: C

8. Which organ pumps blood throughout the human body?

A) Liver
B) Kidney
C) Heart
D) Lungs
E) Brain

Answer: C

9. What is the role of red blood cells?

A) Fight infections
B) Carry oxygen
C) Clot blood
D) Produce antibodies
E) Digest food

Answer: B

10. Which structure in the leaf allows gas exchange?

A) Stomata
B) Chloroplast
C) Xylem
D) Phloem
E) Epidermis

Answer: A

11. What is the monomer of proteins?

A) Nucleotide
B) Monosaccharide
C) Amino acid
D) Fatty acid
E) Glycerol

Answer: C

12. Which type of bond holds the two strands of DNA together?

A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Peptide bond
E) Disulfide bond

Answer: C

13. What is the main function of the digestive system?

A) Transport oxygen
B) Break down food
C) Regulate temperature
D) Produce hormones
E) Remove waste

Answer: B

14. Which organ filters waste from the blood?

A) Liver
B) Kidney
C) Heart
D) Stomach
E) Intestine

Answer: B

15. What is the pigment that absorbs light in photosynthesis?

A) Melanin
B) Hemoglobin
C) Chlorophyll
D) Carotene
E) Anthocyanin

Answer: C

16. Which type of reproduction involves two parents?

A) Asexual
B) Sexual
C) Binary fission
D) Budding
E) Fragmentation

Answer: B

17. What is the functional unit of the nervous system?

A) Nephron
B) Neuron
C) Alveolus
D) Villus
E) Osteon

Answer: B

18. Which blood type is the universal donor?

A) Type A
B) Type B
C) Type AB
D) Type O
E) Type Rh+

Answer: D

19. What is the term for the movement of water across a semipermeable membrane?

A) Diffusion
B) Osmosis
C) Active transport
D) Phagocytosis
E) Exocytosis

Answer: B

20. Which molecule stores genetic information in all living cells?

A) RNA
B) Protein
C) DNA
D) ATP
E) Lipid

Answer: C

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✅ Good luck on your EST2 Biology Exam! Study smart!

Posted for practice purposes only.