Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
Last updated
3,130 questions · page 105 of 157
- A. Gram-positive bacteria
- B. Both gram-positive and gram-negative bacteria
- C. Gram-negative bacteria
- D. All bacteria
Explanation: The nucleoid is the region of cytoplasm where the bacterial genetic material is found.
Correct answer: All bacteria- A. All bacteria
- B. Gram-negative bacteria
- C. Both gram-positive and gram-negative bacteria
- D. Gram-positive bacteria
Explanation: Pili can be found evenly around the surface of the cell, or localized to one or both of the poles.
Correct answer: Gram-negative bacteria- A. PS-I
- B. None of these
- C. PS-I and PS-II both
- D. PS-II
Explanation: Cyanobacteria have two photosystems (PSI and PSII), and anoxygenic phototrophs have either PSI or PSII-like photosystems.
Correct answer: PS-I and PS-II both- A. Cell wall
- B. Slime
- C. Capsule
- D. Cell membrane
Explanation: The cell membrane of bacteria is very delicate and any damage to it can kill the bacteria.
Correct answer: Cell membrane- A. Gram-negative
- B. Gram-positive
- C. None of these
- D. E. coli
Explanation: Neisseria gonorrhoeae, the causative agent of gonorrhoea, is a Gram negative, coffee-bean shaped facultative intracellular diplococcus…
Correct answer: Gram-negative- A. Sodium channels
- B. Heterocysts
- C. Hormogonia
- D. Nitrogenase
Explanation: Cyanobacteria have specialized nitrogen-fixing cells called heterocysts which play a vital role in nitrogen fixation.
Correct answer: Heterocysts- A. Tetracycline
- B. Streptomycin
- C. Azythromycin
- D. Penicillin
Explanation: Tetracycline antibiotic has been found to cause permanent discoloration of teeth in kids below 8 years.
Correct answer: Tetracycline- A. Phosphorus Cycle
- B. Nitrogen Cycle
- C. Carbon Cycle
- D. All of the above
Explanation: In nitrogen cycle :Nitrogen-fixing bacteria convert N2 to ammonia Nitrifying bacteria convert ammonia to nitrates and nitrites…
Correct answer: All of the above2089. E. coli is
- A. Anaerobic
- B. Gram negative
- C. Facultative
- D. All of the above
Explanation: E coli is a gram negative (Stains pink with Gram's stain), facultative and anaerobic microbe.
Correct answer: All of the above- A. Amphitrichous
- B. Atrichous
- C. Lophotrichous
- D. Peritrichous
Explanation: Based on their flagella, bacteria can be classified as follows: Atrichous have no flagella (the suffix 'a' usually implies an absence of…
Correct answer: Atrichous- A. Rod
- B. Egg
- C. Ball
- D. None of these
Explanation: d) None of these: If none of the options accurately describes the shape of Coccobacillus, then this would be the correct answer.
Correct answer: None of these- A. Sporulation
- B. Fission
- C. Apomixis
- D. All of these options are correct
Explanation: Sporulation: Leads to spore formation asexually. Fission: Mechanism of asexual reproduction in prokaryotes.
Correct answer: All of these options are correct- A. Absence of membrane bound cell organelles
- B. Presence of 70S ribosomes
- C. Both Options A and B are correct
- D. None of these
Explanation: Prokaryotic cells lack a nucleus, have no membrane-bound organelles, and have 70S ribosomes.
Correct answer: Both Options A and B are correct- A. Coccus
- B. Spirochete
- C. Vibrio
- D. Bacillus
Explanation: Bacillus, (genus Bacillus), any of a genus of rod-shaped, gram-positive, aerobic or (under some conditions) anaerobic bacteria widely…
Correct answer: Bacillus- A. Tuberculosis and typhoid
- B. Tuberculosis and measels
- C. Tuberculosis and cholera
- D. All of the above
Explanation: Robert Koch discovered the anthrax disease cycle and the bacteria responsible for "tuberculosis and cholera".Option A,B and D are incorrect
Correct answer: Tuberculosis and cholera- A. Bacteria and Protista
- B. Archaea and Eukarya
- C. Eukarya and Monera
- D. Eubacteria and archaea
Explanation: d) Eubacteria and Archaea: This option is correct. Eubacteria, also known as true bacteria, is a group of prokaryotes that are common and…
Correct answer: Eubacteria and archaea- A. Protein
- B. Chemical
- C. Enzyme
- D. None of the above options are correct
Explanation: Flagella are made up of a protein called flagellin, which forms long filaments that are the structural backbone of the flagellum.
Correct answer: Protein- A. Protection from enviroment
- B. Protection from engulfment
- C. Protection from osmotic lysis
- D. All of the above
Explanation: The capsule is tightly bound to the bacterial cell. It is a part of the cell envelope.
Correct answer: Protection from engulfment- A. Archaebacteria and vibrio bacteria
- B. Eubacteria and Streptococus
- C. Eubacteria and Archaebacteria
- D. Cyanobacteria and Archaebacteria
Explanation: Eubacteria and Archaebacteria are the two main domains of prokaryotic organisms.Eubacteria are the most familiar type of bacteria that…
Correct answer: Eubacteria and Archaebacteria- A. Both are same in size
- B. Both help in movement
- C. Both are composed of proteins
- D. All of the above options are correct
Explanation: Option A: This is not the correct option because pili are smaller than flagella.Option B: Flagella help in locomotion while pili are used…
Correct answer: Both are composed of proteins