All Free Biology MCQs with Answers

• A. Mesosomes and cell membrane
• B. Cell membraneand ribosome
• C. Mesosomes and ribosomes
• D. All of Above

Explanation: The cell membrane regulates the transport of proteins, nutrients, sugar, and electrons or other metabolites.

• A. Purple spheres
• B. Clear rods
• C. Pink rods
• D. Purple spirals

Explanation: Methicillin-resistant Staphylococcus aureus (MRSA) is a type of Gram-positive bacterium that is resistant to multiple antibiotics…

• A. Gram-positive bacteria
• B. Gram-negative bacteria
• C. Chemosynthetic bacteria
• D. None of above

Explanation: Pili, are more commonly found in Gram-negative bacteria. While some Gram-positive bacteria may have surface appendages or structures that…

• A. Motility
• B. Conjugation
• C. Chemical detection
• D. None of above

Explanation: Based on the explanations provided, the correct answer to the question is option B) Conjugation.

• A. Staphylococci
• B. Pseudomonas
• C. Diplococcus pneumonia
• D. Mycoplasmas

Explanation: Based on the explanations provided, the correct answer to the question is option D) Mycoplasmas.

• A. Cell membrane
• B. Chromatin
• C. Ribosome
• D. Capsule

Explanation: Based on the explanations provided, the correct answer to the question is option D) Capsule.

• A. Conjugation
• B. Transformation
• C. Transduction
• D. Binary Fission

Explanation: Based on the explanations provided, the correct answer to the question is option D) Binary Fission.

• A. Cocci
• B. Bacilli
• C. Streptobacillus
• D. Vibrio

Explanation: Based on the explanations provided, the correct answer to the question is option A) Cocci. Cocci bacteria do not commonly have flagella.

• A. The bacteria is anaerobic
• B. The bacterial sample was pretreated with 3% ethanol
• C. The bacteria's periplasmic space
• D. The bacteria's thick peptidoglycan cell walls

Explanation: Based on the explanations provided, the correct answer to the question is option D) The bacteria's thick peptidoglycan cell walls.

• A. Protein
• B. Enzyme
• C. Chemical
• D. None of above

Explanation: Flagella is composed of protein flagellin.

• A. Absence of membrane bound cell organelles
• B. Absence of nucleus
• C. Presence of 70S ribosomes
• D. All of these

Explanation: Prokaryotes lack membrane-bound organelles such as mitochondria. They do not contain a nucleus as there is no membrane separating the…

• A. To give cells rigidity
• B. To give specific shape
• C. To protect from osmotic lysis
• D. All of the above

Explanation: The cell wall provides structural support to the cell, preventing it from collapsing under its internal pressure.

• A. Eubacteria
• B. Archaeobacteria
• C. Cyanobacteria
• D. None of above

Explanation: Eubacteria, also known as true bacteria or bacteria, are a major group of prokaryotic microorganisms.

• A. Diplococcus
• B. Tetrad
• C. Peritriehous
• D. Monotrichous

Explanation: A type of bacterial cell that is completely surrounded by flagella is called peritrichous.

• A. Spores
• B. Cysts
• C. Granules
• D. All of Above

Explanation: Spores are the most heat resistant form of bacteria. They are formed by some bacteria when environmental conditions become very harsh.

• A. It forms a bridge between two bacterial cells
• B. It involves transport of genetic material via vectors
• C. It is a form of sexual reproduction
• D. Both B and C

Explanation: The answer is Both B and C.Bacterial conjugation is a form of horizontal gene transfer, which is the transfer of genetic material between…

• A. Proteins
• B. Lipids
• C. Enzymes
• D. Chemicals

Explanation: ATP synthase: This enzyme is responsible for the synthesis of ATP from ADP and phosphate.

• A. Binary fission and mitosis
• B. Binary fission and meiosis
• C. Binary fission and transformation
• D. Binary fission

Explanation: Prokaryotic cells divide through a form of asexual reproduction called binary fission.

• A. Glycoproteins
• B. Polysaccharides
• C. Proteins
• D. Peptidoglycan

Explanation: Archaebacteria doesn't contain peptidoglycan.

• A. Cilia
• B. Flagella
• C. Pili
• D. Pseudopodia

Explanation: Flagella are long thread like structures which are used for locomotion.