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. Slime
- B. Capsule
- C. Cell wall
- D. Cell membrane
Explanation: Mollicutes is a class of bacteria which does not contain cell wall in its cell envelope.While in most of the bacteria the cell envelope…
Correct answer: Cell wall- A. Robert Koch
- B. Louis Pasteur
- C. Alexander Fleming
- D. Leeuwenhoek
Explanation: Animalcule ('little animal', from Latin animal + the diminutive suffix -culum) is an old term for microscopic organisms that included…
Correct answer: Leeuwenhoek- A. Cytoplasmic matrix
- B. Cytoplasm
- C. Protoplast
- D. Cell Structure
Explanation: The protoplasm consists of two major divisions in eukaryotes: the cytoplasm, and the nucleoplasm (cell nucleus).
Correct answer: Protoplast- A. To give cells rigidity
- B. To give specific shape
- C. To protect from osmotic lysis
- D. All of Above
Explanation: All prokaryotic cells have a stiff cell wall located underneath the capsule (if there is one).
Correct answer: All of Above- A. Archea Bacteria
- B. Cyano Bacteria
- C. Eu-bacteria
- D. Both B and C
Explanation: Eubacteria, on the other hand, encompass a wide range of bacteria that can be found in various habitats, including soil, water, and the…
Correct answer: Eu-bacteria- A. Heterotrophic bacteria
- B. Saprotrophic bacteria
- C. Chemosynthetic bacteria
- D. Photosynthetic bacteria
Explanation: Option A: Heterotrophic bacteria is incorrect because heterotrophic bacteria are bacteria that obtain their energy from organic compounds…
Correct answer: Photosynthetic bacteria- A. Transduction
- B. Transformation
- C. Binary fission
- D. Conjugation
Explanation: Option A: Transduction is the process by which genetic material is transferred from one bacterium to another by a bacteriophage (a virus…
Correct answer: Binary fission- A. Slime
- B. Cell Wall
- C. Cell Membrane
- D. Capsule
Explanation: In the question, you need to identify the structure that provides greater pathogenicity to the bacteria.
Correct answer: Slime- A. 40% of dry weight
- B. 50% of dry weight
- C. 10% of dry weight
- D. 80% of dry weight
Explanation: Gram-positive bacteria have a thick peptidoglycan layer, which comprises 50% of their dry weight.
Correct answer: 50% of dry weight- A. Gram-negative bacteria are more likely to cause systemic effects because they lack an outer membrane, which means they can more quickly infect host cells
- B. Gram-negative bacteria are more likely to cause systemic effects because their outer membrane protects them from antibiotics
- C. Both Options A and B are correct
- D. None of these options are correct
Explanation: gram-negative bacteria have thinner membranes, which allows them to resist many antibacterial medicines.
Correct answer: Gram-negative bacteria are more likely to cause systemic effects because their outer membrane protects them from antibiotics- A. Gram-negative
- B. Gram-positive
- C. Capsule
- D. Both Gram positive & negative
Explanation: The Gram stain procedure distinguishes between Gram positive and Gram negative groups by coloring these cells red or violet.
Correct answer: Gram-positive- A. Cube of 8 cocci
- B. Square of 4 cocci
- C. Irregular structure
- D. Triangular 6 cocci
Explanation: Sarcina is a genus of gram-positive cocci bacteria in the family Clostridiaceae.
Correct answer: Cube of 8 cocci- A. Bacillus anthracis
- B. Escherichia coli
- C. Spirillum minus
- D. Staphylococcus aureus
Explanation: Staphylococcus aureus (cocci) is a round shaped bacteria. Since it is spherical in shape therefore it is the right choice here.
Correct answer: Staphylococcus aureus- A. Proteins
- B. Lipids
- C. Enzymes
- D. Chemicals
Explanation: Bacterial cells lack membrane-bound organelles such as mitochondria. Therefore, the enzymes needed for respiration are present in…
Correct answer: Enzymes- A. Radiation
- B. Filtration
- C. High temperature
- D. Antiseptic
Explanation: Option A:Sterilization by ionizing radiation, primarily by cobalt 60 gamma rays or electron accelerators, is a low-temperature…
Correct answer: Antiseptic- A. Diplococcus
- B. Tetrad
- C. Peritrichous
- D. Monotrichous
Explanation: Diplococcus and Tetrad are some of the shapes of bacteria and are not related to flagella. Monotrichous means 1 flagella.
Correct answer: Peritrichous- A. Sexual reproduction
- B. Binary fission
- C. Mitosis
- D. Conjugation
Explanation: The following diagram shows reproduction by conjugation and it can be seen that the recipient forms a pilus at the end.
Correct answer: Conjugation- A. Helix
- B. Around
- C. Rod
- D. Rigid helix
Explanation: c) Rod: The correct answer is option (c) "Rod." Rod-shaped bacteria are also known as bacilli. They have a cylindrical or rod-like shape.
Correct answer: Rod- A. Facultative anaerobes
- B. Obligate aerobes
- C. Obligate anaerobes
- D. Facultative aerobes
Explanation: Obligate aerobes are bacteria that need oxygen to grow and multiply but cannot do so in the absence of oxygen.
Correct answer: Obligate aerobes- A. Vibrio
- B. Cocci
- C. Spirilla
- D. Bacilli
Explanation: Menaquinones are the naturally occurring form of vitamin K identified in bacteria. Bacilli in intestine produce vitamin K.
Correct answer: Bacilli