Biology Quiz

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Welcome to our Biology Quiz!

Are you ready to explore the wonders of the natural world and test your knowledge of living organisms?

Dive into our Free Online Biology Quiz and unravel the mysteries of life. This interactive quiz is designed for biology enthusiasts of all levels—whether you’re just starting out or already well-versed in the subject.

Discover fascinating facts, challenge your understanding of biological concepts, and gain valuable insights to deepen your appreciation for the diversity of life on Earth. It’s engaging, educational, and best of all, it’s free!

Why wait? Embark on your biology journey today and cultivate a deeper understanding of the living world around you!

Disclaimer: The hard questions in the Biology Quiz are challenging. To finish the game and reaching the master level typically requires a significant amount of grit, determination and perseverance. I you want to learn more about biology check out our article about Biology as a passion.

Question 1:

Which hormone is primarily responsible for root formation in plant cuttings?

Click to see Hint ⬇
Think about what helps roots grow.
Click to see Answer ⬇
Auxins - Auxins stimulate root growth at the cutting sites, making them essential for propagation.

Question 2:

Which hormone is responsible for the growth of facial hair in men?

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Consider the primary male hormone.
Click to see Answer ⬇
Testosterone - Testosterone is a key hormone that stimulates the development of facial hair during puberty and adulthood.

Question 3:

Which name is commonly associated with the theory of evolution in biology?

Click to see Hint ⬇
He is known for his expedition on the HMS Beagle.
Click to see Answer ⬇
Charles Darwin - Charles Darwin is renowned for his pioneering work on the theory of evolution, which has had a profound impact on the field of biology.

Question 4:

What material are seashells primarily made of?

Click to see Hint ⬇
Consider the composition of other natural materials found in the ocean.
Click to see Answer ⬇
Calcium carbonate - The majority of seashells consist of calcium carbonate, which is also found in materials like limestone and marble.

Question 5:

What causes the variety of colors in seashells?

Click to see Hint ⬇
Consider how the environment can influence the appearance of seashells.
Click to see Answer ⬇
Mineral deposits - Minerals in the environment can infiltrate the shell, leading to vibrant coloration.

Question 6:

What is the process by which plants make their food using sunlight, carbon dioxide, and water?

Click to see Hint ⬇
Plants use sunlight to make food.
Click to see Answer ⬇
Photosynthesis - Photosynthesis is a complex process involving the conversion of light energy into chemical energy, which is used to produce glucose and oxygen.

Question 7:

What is the process by which an organism changes over time to better survive in its environment?

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It involves changes that help an organism survive in its environment.
Click to see Answer ⬇
Adaptation - Adaptation involves genetic changes that enhance an organism's ability to thrive in a specific environment, ensuring its survival and reproduction.

Question 8:

What is the powerhouse of the cell?

Click to see Hint ⬇
Think about the organelle responsible for energy production.
Click to see Answer ⬇
Mitochondria - Mitochondria are double-membraned organelles found in most eukaryotic organisms. They are known as the powerhouse of the cell due to their role in producing ATP through cellular respiration.

Question 9:

What is the process by which plants take in water through their roots and release it as vapor through their leaves?

Click to see Hint ⬇
Think about the process of water movement in plants.
Click to see Answer ⬇
Transpiration - Transpiration is a crucial process in a plant's life cycle, as it helps to transport water and nutrients from the roots to the rest of the plant and also cools the plant.

Question 10:

Which of the following is responsible for carrying genetic information in the form of genes?

Click to see Hint ⬇
Think about the structures that contain genetic information.
Click to see Answer ⬇
Chromosomes - Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. They carry genetic information in the form of genes and play a crucial role in cell division and inheritance.

Question 11:

Which of the following is responsible for carrying out protein synthesis in a cell?

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Think about the organelle involved in protein synthesis.
Click to see Answer ⬇
Ribosomes - Ribosomes are small, spherical organelles that are responsible for the synthesis of proteins in a cell. They can be found in the cytoplasm or attached to the endoplasmic reticulum.

Question 12:

What is the function of the mitochondria in a cell?

Click to see Hint ⬇
Mitochondria are known as the powerhouse of the cell.
Click to see Answer ⬇
Energy production - Mitochondria are double-membrane-bound organelles found in the cytoplasm of eukaryotic cells. They are responsible for producing the energy currency of the cell through cellular respiration.

Question 13:

What is the role of DNA in living organisms?

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DNA carries genetic instructions for living organisms.
Click to see Answer ⬇
Genetic information storage - DNA, or deoxyribonucleic acid, is a molecule that carries most of the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.

Question 14:

What is the process by which plants convert light energy into chemical energy?

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Plants use this process to produce their own food.
Click to see Answer ⬇
Photosynthesis - Photosynthesis is a complex series of reactions that convert light energy, water, and carbon dioxide into the energy-rich molecule glucose and release oxygen as a byproduct.

Question 15:

What is the function of the ribosomes in a cell?

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Ribosomes are the site of protein synthesis in a cell.
Click to see Answer ⬇
Protein synthesis - Ribosomes are cellular structures responsible for protein synthesis by translating genetic information from messenger RNA into functional proteins.

Question 16:

Which of the following organelles is responsible for detoxifying harmful substances in a cell?

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This organelle is involved in the breakdown of fatty acids and detoxification.
Click to see Answer ⬇
Peroxisome - Peroxisomes are single-membrane-bound organelles containing oxidative enzymes involved in lipid metabolism and the detoxification of harmful substances by producing hydrogen peroxide.

Question 17:

Which of the following is not a function of the Golgi apparatus in a cell?

Click to see Hint ⬇
Consider the roles of the Golgi apparatus in cellular processes.
Click to see Answer ⬇
Lipid synthesis - The Golgi apparatus primarily processes and packages proteins and lipids, and it forms vesicles for transportation within the cell.

Question 18:

Which of the following is not a characteristic of prokaryotic cells?

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Consider the defining features of prokaryotic cells.
Click to see Answer ⬇
Complex internal structure - Prokaryotic cells lack a true nucleus and membrane-bound organelles, and they are generally smaller and simpler in structure compared to eukaryotic cells.

Question 19:

Which of the following is not a function of the endoplasmic reticulum (ER) in a cell?

Click to see Hint ⬇
Consider the roles of the endoplasmic reticulum (ER) in cellular functions.
Click to see Answer ⬇
ATP production - The endoplasmic reticulum (ER) is involved in lipid synthesis, protein folding, and calcium ion storage, but it does not produce ATP.

Question 20:

Which of the following is not a component of the cytoskeleton in a cell?

Click to see Hint ⬇
Consider the structural elements of the cytoskeleton.
Click to see Answer ⬇
Golgi bodies - The cytoskeleton is composed of microtubules, microfilaments, and intermediate filaments, providing structural support and facilitating cellular movement, but it does not include Golgi bodies.

Question 21:

Which of the following is not a function of the lysosomes in a cell?

Click to see Hint ⬇
Consider the roles of lysosomes in cellular processes.
Click to see Answer ⬇
Regulation of cell metabolism - Lysosomes primarily function in the digestion of cellular waste, cellular defense, and autophagy, but they do not regulate cell metabolism.

Question 22:

What is the significance of synthetic biology in biotechnology?

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Synthetic biology is focused on creating innovative biotechnological tools and systems.
Click to see Answer ⬇
To develop new biotechnological tools - Synthetic biology aims to engineer biological systems and develop new biotechnological tools, such as biosensors, gene circuits, and metabolic pathways.

Question 23:

What is the scientific term for an organism composed of cells from different zygotes?

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The term is also used in mythology.
Click to see Answer ⬇
Chimera - A chimera is an organism containing two or more populations of genetically distinct cells that originated from different zygotes involved in sexual reproduction.

Question 24:

In genetics, what does 'mosaic' refer to?

Click to see Hint ⬇
Think about genetic variation and different cell populations.
Click to see Answer ⬇
An organism composed of cells from different zygotes - In genetics, a mosaic refers to an organism that contains two or more populations of cells with different genotypes due to genetic mutation or chimerism.

Question 25:

Which of the following is not a type of microorganism?

Click to see Hint ⬇
Think about the size of microorganisms.
Click to see Answer ⬇
Plants - Microorganisms are microscopic organisms such as bacteria, fungi, and viruses. Plants are not included in this category.

Question 26:

Which of the following is a method for sterilizing equipment in a laboratory?

Click to see Hint ⬇
Think about common laboratory practices for sterilization.
Click to see Answer ⬇
Boiling in water - Boiling in water is an effective way to kill microorganisms and sterilize laboratory equipment.

Question 27:

Which of the following is a characteristic of a virus?

Click to see Hint ⬇
Think about the impact of viruses on living organisms.
Click to see Answer ⬇
Can cause diseases - Viruses are infectious agents that can cause a range of diseases in animals, plants, and even bacteria.

Question 28:

Which of the following is a common shape for bacteria?

Click to see Hint ⬇
Think about the different shapes of bacteria.
Click to see Answer ⬇
Spherical - Spherical, or coccus, is a common shape for bacteria, along with other shapes such as rod-shaped (bacillus) and spiral (spirillum).

Question 29:

Which of the following is a common method for identifying bacteria in a laboratory?

Click to see Hint ⬇
Think about staining techniques used in microbiology.
Click to see Answer ⬇
Gram staining - Gram staining is a differential staining technique used to classify bacteria into two groups based on their cell wall composition, aiding in their identification.

Question 30:

What is the primary function of the Golgi apparatus in a eukaryotic cell?

Click to see Hint ⬇
Think about the role of the Golgi apparatus in protein processing.
Click to see Answer ⬇
Post-translational modification and sorting of proteins - The Golgi apparatus receives proteins from the endoplasmic reticulum and modifies them before sorting and packaging them into vesicles for transportation.

Question 31:

Which of the following is a characteristic of gram-negative bacteria?

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Consider the unique structural feature of gram-negative bacteria.
Click to see Answer ⬇
Outer membrane with lipopolysaccharides - The outer membrane of gram-negative bacteria contains lipopolysaccharides, which have important implications for antibiotic resistance and immune response.

Question 32:

Which of the following is a method for the direct measurement of microbial growth in a culture?

Click to see Hint ⬇
Think about methods that directly assess the density of microbial populations.
Click to see Answer ⬇
Turbidity measurement using a spectrophotometer - Turbidity, or cloudiness, of a culture is proportional to the number of microorganisms present, making it a direct measurement of microbial growth.

Question 33:

Which of the following is a characteristic of a plasmid in bacteria?

Click to see Hint ⬇
Consider the unique replication feature of plasmids in bacteria.
Click to see Answer ⬇
Replicates independently of the chromosomal DNA - Plasmids are extrachromosomal DNA elements that replicate independently and often carry non-essential genes, such as antibiotic resistance genes.

Question 34:

What is the primary function of reverse transcriptase in retroviruses?

Click to see Hint ⬇
Think about the process by which retroviruses incorporate their genetic material into the host cell.
Click to see Answer ⬇
Transcription of viral RNA into host DNA - Reverse transcriptase is a unique enzyme in retroviruses that catalyzes the synthesis of DNA from the viral RNA template, enabling integration into the host genome.

Question 35:

Which of the following is a characteristic of atypical bacteria?

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Atypical bacteria exhibit unconventional characteristics.
Click to see Answer ⬇
They do not fit into the typical classification of bacteria - Atypical bacteria exhibit unique characteristics that set them apart from typical bacteria, making their classification challenging.

Question 36:

What is the primary mode of transmission for Legionella pneumophila?

Click to see Hint ⬇
Consider water sources as a transmission route for Legionella pneumophila.
Click to see Answer ⬇
Airborne transmission from water sources - Legionella pneumophila is commonly transmitted through the inhalation of aerosols from contaminated water sources such as cooling towers, hot tubs, and plumbing systems.

Question 37:

Which of the following is a characteristic of methicillin-resistant Staphylococcus aureus (MRSA)?

Click to see Hint ⬇
Consider the specific protein associated with MRSA resistance.
Click to see Answer ⬇
Presence of penicillin-binding protein PBP2a - MRSA strains possess the mecA gene, which encodes penicillin-binding protein PBP2a, leading to resistance against beta-lactam antibiotics such as methicillin.

Question 38:

Which of the following is a characteristic of Pseudomonas aeruginosa biofilms?

Click to see Hint ⬇
Consider the resistance of Pseudomonas aeruginosa biofilms to host immune responses.
Click to see Answer ⬇
Highly resistant to host immune responses - Pseudomonas aeruginosa biofilms are known for their ability to resist host immune responses, making them challenging to eradicate and contributing to chronic infections, particularly in cystic fibrosis patients.

Question 39:

Which of the following is a characteristic of Mycobacterium tuberculosis cell wall composition?

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Consider the unique component of Mycobacterium tuberculosis cell wall.
Click to see Answer ⬇
Contains mycolic acids - The cell wall of Mycobacterium tuberculosis is composed of mycolic acids, which play a crucial role in its resistance to environmental stresses and pathogenicity.

Question 40:

What is the basic unit of life?

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The smallest unit of life.
Click to see Answer ⬇
Cell - Cells are the smallest independently functioning unit in the structure of living organisms.

Question 41:

What is the process by which green plants use sunlight to synthesize food from carbon dioxide and water?

Click to see Hint ⬇
This process involves the use of sunlight to create food for plants.
Click to see Answer ⬇
Photosynthesis - Photosynthesis is the fundamental process by which plants convert light energy into chemical energy, producing their own food.

Question 42:

What is the gestation period of a cow?

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This gestation period is similar to that of humans.
Click to see Answer ⬇
9 months - Similar to humans, cows carry their calves for approximately 9 months before giving birth.

Question 43:

How do homing pigeons navigate their way back home over long distances?

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Consider the natural forces that homing pigeons may use for navigation.
Click to see Answer ⬇
Using the Earth's magnetic field - Homing pigeons are thought to have a biological compass that allows them to sense the Earth's magnetic field and navigate accordingly.

Question 44:

What is the term for the process by which plants respond to increasing day length in spring and summer?

Click to see Hint ⬇
Consider the response of plants to day length.
Click to see Answer ⬇
Photoperiodism - Photoperiodism is the physiological reaction of organisms to the length of day or night.

Question 45:

What is the term for the process by which green plants and some other organisms use sunlight to synthesize foods with the release of oxygen, often associated with the summer season?

Click to see Hint ⬇
It's the process by which plants use sunlight to make food and oxygen.
Click to see Answer ⬇
Photosynthesis - Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods, releasing oxygen as a byproduct. This process is crucial for the production of food and oxygen, particularly during the summer months.