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.
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- A. Nucleus
- B. Plasmid
- C. Mitochondria
- D. Both Options A and B are correct
Explanation: Prokaryotes can also contain plasmids, which are much smaller circular pieces of DNA that often have genes that give antibiotic…
Correct answer: Plasmid- A. Bacteria contain plasma membranes that are made up of triglycerides
- B. Gram staining reveals that bacteria contain cell walls, but no cell membranes
- C. Bacteria do not contain a membrane-bound nucleus, but they contain an non membrane-bound structure called the nucleoid
- D. All of these options are false
Explanation: Option A; All cells including bactria contain cell membrane but it is not made up of triglycerides.Option B: Gram staining tells us about…
Correct answer: Bacteria do not contain a membrane-bound nucleus, but they contain an non membrane-bound structure called the nucleoid- A. Nucleus
- B. DNA
- C. Cell membrane
- D. Mitochondria
Explanation: Although blood is an excellent source of DNA, the DNA does not come from the red blood cells, as these cells have no nuclei.
Correct answer: DNA- A. Aerobic
- B. Facultative
- C. Anaerobic
- D. Both Options A and B are correct
Explanation: Spirochaeta are free-living nonpathogenic inhabitants of mud and water, typically thriving in anaerobic (oxygen-deprived) environments
Correct answer: Anaerobic2105. In prokaryotes, the hair-like outgrowths which attach to the surface of other bacterial cells are _.
- A. Flagella
- B. Pili
- C. Capsules
- D. Plasmids
Explanation: Fimbriae and pili are hair-like appendages present on the bacterial cell wall similar to flagella.
Correct answer: Pili- A. Heterotrophic bacteria
- B. Saprotrophic bacteria
- C. Chemosynthetic bacteria
- D. Parasitic bacteria
Explanation: Chemosynthetic bacteria oxidise inorganic compounds like ammonia, nitrate, nitrite, sulphur or ferrous ions and use the energy thus…
Correct answer: Chemosynthetic bacteria- 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: Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which allows them to take up the crystal violet colour of…
Correct answer: The bacteria's thick peptidoglycan cell walls- A. A bacterium
- B. A virus
- C. A parasite
- D. Protozoa
Explanation: Epulopiscium fishelsoni is a very large bacterium that only lives in the gut of a brown surgeonfish found in the Red Sea.
Correct answer: A bacterium- A. Cillia
- B. Flagella
- C. Pili
- D. Pseudopodia
Explanation: The bacterial flagellum is a motile organelle composed of thousands of protein subunits.
Correct answer: Flagella- A. Lophotrichous
- B. Peritrichous
- C. Monotrichous
- D. Amphitrichous
Explanation: OPTION A: A lophotrichous bacterium has a group of two or more flagella inserted at one pole of the cell.
Correct answer: Amphitrichous- A. Cell wall
- B. Genetic material
- C. Cytoplasm
- D. Mitochondria
Explanation: OPTION A: The cell wall is present in both prokaryotes and eukaryotes. OPTION B: DNA is the genetic material present in both prokaryotes…
Correct answer: Mitochondria- A. Motality
- B. Conjugation
- C. Chemical detection
- D. None of above options are correct
Explanation: Option A : Pilli is not involved in motility. Motility is the function of flagella.
Correct answer: Conjugation- A. Constitutive anaerobe
- B. Facultative anaerobe
- C. Constitutive aerobe
- D. Obligate anaerobe
Explanation: A facultative anaerobe is any organism that is able to produce energy aerobically and ''switch to anaerobic respiration depending on the…
Correct answer: Facultative anaerobe- A. Long chain of cells
- B. Planes of division
- C. Grape like clusture shape
- D. All of Above
Explanation: The coccus shape can appear in different arrangements depending upon the plane of division.
Correct answer: Planes of division- A. Gram-positive bacteria
- B. Gram-negative bacteria
- C. Both A and B
- D. Mycoplasmas
Explanation: Since Gram-positive bacteria have a single-layered wall, the movement of particles is easier than that of gram-negative bacteria, which…
Correct answer: Gram-positive bacteria2116. Chemical substances used on living tissues that inhibit the growth of microorganisms are called
- A. Disinfectant
- B. Sanitizer
- C. Antibiotic
- D. Antiseptics
Explanation: Antiseptics prevent the growth of disease-causing microorganisms.
Correct answer: Antiseptics- A. Facultative anaerobe
- B. Aerotolerant anaerobe
- C. Obligate aerobe
- D. Obligate anaerobe
Explanation: Obligate anaerobes are microorganisms killed by normal atmospheric concentrations of oxygen.
Correct answer: Obligate anaerobe- A. Cocci
- B. Filamentous
- C. Spiral
- D. Bacilli
Explanation: Option B is correct.On the basis of general shape, bacteria are classified into three categories.
Correct answer: Filamentous- A. Cytoplasmic matrix
- B. Cytoplasm
- C. Protoplast
- D. Cell Structure
Explanation: Protoplasm is referred to as the living part of the cell which includes the cytoplasm, nucleus, excluding the cell wall.
Correct answer: Protoplast- A. Protist
- B. Cyanobacteria
- C. Archaea
- D. Bacteria
Explanation: This question requires the candidate to make use of his/her analytical skills, by co-relating the concepts studied in Kingdom Prokaryote.
Correct answer: Archaea