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 108 of 157
- A. Positive bacteria
- B. Negative bacteria
- C. Gram-negative
- D. Gram-positive
Explanation: Gram-positive bacteria have a thick peptidoglycan layer and no outer lipid membrane which gives a positive result in the gram stain test…
Correct answer: Gram-positive- A. O2
- B. CO2
- C. NO2
- D. NO3
Explanation: Nitrogen fixing bacteria contain an enzyme complex known as Nitrogenase which catalyses the conversion of nitrogen gas to ammonia.
Correct answer: O2- A. Beta-proteo bacteria
- B. Alpha-proteobacteria
- C. Gamma-proteo bacteria
- D. Delta proteo bacteria
Explanation: Sulfur bacteria belongs to gamma-proteo bacteria which take part in nitrogen and sulfur cycling processes
Correct answer: Gamma-proteo bacteria- A. Log phase
- B. Lag phase
- C. Growth phase
- D. Decline phase
Explanation: Bacterial cells divide at exponential rate during log phase, hence disease symptoms become prominent during this phase.
Correct answer: Log phase- A. Antibiotic resistance gene
- B. Origin of replication
- C. Cloning site
- D. Ligases enzymes
Explanation: An essential feature of bacterial plasmids is their ability to replicate as autonomous genetic elements in a controlled way within the…
Correct answer: Origin of replication- A. Induction
- B. Transformation
- C. Transduction
- D. Conjugation
Explanation: Transduction is the process by which a virus transfers genetic material from one bacterium to another.
Correct answer: Transduction- A. Oxidation of bacterial compounds
- B. Coagulation of bacterial proteins
- C. Separate the bacteria from their media
- D. Decrease in bacterial growth
Explanation: Is correct as During the sterilization process, oxidation of bacterial compounds can occur due to the exposure of bacteria to various…
Correct answer: Oxidation of bacterial compounds- A. Sulphur
- B. Oxygen
- C. Hydrogen
- D. Carbon dioxide
Explanation: The following are the chemical equations of photosynthesis in photosynthetic bacteria;
Correct answer: Sulphur- A. Mutation in bacterial genome
- B. Denaturation of bacterial proteins
- C. Activation of bacteria
- D. Bacteria to become pathogen
Explanation: A is the most suitable option since X-rays do cause mutations in bacterial genomes and prevent them from dividing.
Correct answer: Mutation in bacterial genome- A. Steroid
- B. Respiratory enzymes
- C. Cholesterol
- D. Phospholipids
Explanation: Cholesterol (or other higher sterols such as ergosterol and phytosterols) is universally present in large amounts (20-40 mol%) in…
Correct answer: Cholesterol2151. Pili are hollow, non helical, filamentous appendages in bacteria. Which one is not true for pili:
- A. They are involved in mating process
- B. They are the means of attachments of bacteria to various surfaces
- C. They are made up of protein
- D. These are present in gram-positive bacteria
Explanation: Pili are a characteristic of Gram-negative bacteria.
Correct answer: These are present in gram-positive bacteria- A. Diplococcus
- B. Tetrad
- C. Sarcina
- D. Staphylococcus
Explanation: This option is correct because when Bacteria appear in pairs, then it is named as diplococci.
Correct answer: Diplococcus- A. Cocci
- B. Streptobaccilus
- C. Bacillus
- D. Diplobacilli
Explanation: A single rod-shaped bacterium is called a Bacillus.
Correct answer: Bacillus- A. Cocci
- B. Vibrio
- C. Spirillum
- D. Bacilli
Explanation: This option is correct because Spirilla (singular, Spirillum) are a group of bacteria characterized by a corkscrew (spiral) appearance.
Correct answer: Spirillum- A. Flagellated bacteria can detect chemicals
- B. The flagellated bacteria moves in response to a chemical signal
- C. Help in motility
- D. On some bacteria, flagella have a role in immunity
Explanation: The primary function of flagella is to aid in the motility of bacteria, allowing them to move through liquid environments.
Correct answer: Help in motility- A. Heterotrophs
- B. Saprotrophic
- C. Parasitic
- D. Autotrophic
Explanation: This option is correct because Saprotrophic bacteria. known as saprophytic bacteria, are a subset of heterotrophic. bacteria.
Correct answer: Saprotrophic- A. Anaerobes
- B. Molds
- C. Aerobes
- D. Yeasts
Explanation: This option is correct because Anaerobic bacteria are microorganisms that can grow and thrive in the absence of oxygen.
Correct answer: Anaerobes- A. Immunization
- B. Sterilization process
- C. Vaccination
- D. Chemical methods
Explanation: This option is correct because Sterilization is the process of using physical or chemical methods to completely eliminate or kill all…
Correct answer: Sterilization process- A. Cell membrane
- B. Capsule
- C. Cell wall
- D. Slime
Explanation: The cell wall is the structure responsible for giving shape to bacterial cells is a rigid layer that surrounds the cell membrane and…
Correct answer: Cell wall- A. Peptidoglycan
- B. rRNA
- C. Histones
- D. Teichoic acid
Explanation: This option is correct because bacteria do not have histones. In contrast to sukaryotic cells, bacterial DNA is not wrapped around…
Correct answer: Histones