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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3,130 questions · page 141 of 157
- A. Prokaryotes generate sodium gradients across their nuclear membranes
- B. Prokaryotes do not generate energy
- C. Prokaryotes produce energy via photosynthesis
- D. Prokaryotes generate proton gradients across their plasma membranes
Explanation: Although prokaryotes lack mitochondria and other membrane-bound organelles, they are able to generate a proton gradient across their cell…
Correct answer: Prokaryotes generate proton gradients across their plasma membranes- A. Coccus
- B. Vibrio
- C. Spirillum
- D. Bacillus
Explanation: Option C is correct as bacteria classified as "spirillum" are spiral in shape.
Correct answer: Spirillum2803. Which of the following structure primarily helps in attachment of bacteria on various surfaces?
- A. Pilli
- B. Flagella
- C. Both A and B
- D. None of these
Explanation: Flagella help in locomotion whereas pilli help in attachment.
Correct answer: Pilli- A. Gram-positive
- B. Both Gram-positive and Gram-negative
- C. Gram-negative
- D. Capsule
Explanation: If lipopolysaccharides (LPS) did not appear in the wall of bacteria on staining, it would be known as Gram-positive bacteria
Correct answer: Gram-positive- A. Peptidoglycans
- B. Flagellin
- C. Bacteriorhodopsin
- D. Chitin
Explanation: Chitin is found in fungal cell walls 1 arthropod exoskeletons, not in bacteria or archaea, whereas peptidoglycan, flagellin, and…
Correct answer: Chitin- A. Single cell
- B. Chain of bacilli
- C. Pairs of bacilli
- D. All of Above
Explanation: It is a genus of facultatively anaerobic gram-negative rod-shaped bacteria (family Fusobacteriaceae) in which the individual cells are…
Correct answer: Chain of bacilli- A. Plasmid
- B. Nucleotide
- C. Mesosomes
- D. All of these
Explanation: Plasmids often contain drug-resistant, heavy metals, disease, and insect-resistant genes on them.
Correct answer: Plasmid- A. Cell membrane
- B. Chromatin
- C. Ribosome
- D. Capsule
Explanation: Not all bacteria have capsules present. They all have a slime layer but this is only classified as a capsule when visible under the…
Correct answer: Capsule- A. Readily incorporate cloned DNA
- B. Capable of autonomous replication
- C. Capable of being isolated from genomic DNA
- D. All of these
Explanation: All of these characteristics collectively make plasmid DNA a valuable tool for researchers, as they enable the introduction, replication…
Correct answer: All of these- A. Heterotrophic bacteria
- B. Saprotrophic bacteria
- C. Chemosynthetic bacteria
- D. Parasitic bacteria
Explanation: Parasitic bacteria are those which obtain nutrients from the host they live on, they rely on the host for their food.
Correct answer: Parasitic bacteria- A. Bacilli
- B. Strephylobaccilus
- C. Bacillus
- D. Diplobacilli
Explanation: A. Rod shaped bacteria (plural)B. Chain of bacilliD. Pair arrangement
Correct answer: Bacillus- A. Mesosome
- B. Ribosomes
- C. Golgi bodies
- D. Mitochondria
Explanation: The correct answer is 'Ribosomes.' In bacteria, which are prokaryotic organisms, ribosomes are present and essential for protein…
Correct answer: Ribosomes- A. Cocci
- B. Bacilli
- C. Spirilla
- D. Vibrio
Explanation: Bacteria are classified according to their shape, which is an essential characteristic for identification.
Correct answer: Vibrio- A. Cytoplasmic matrix
- B. Cytoplasm
- C. Protoplasm
- D. Cell Structure
Explanation: The correct answer is 'Protoplasm'. In the context of bacteria, the protoplasm is the term used to describe all the living contents within…
Correct answer: Protoplasm- A. Staphylococci
- B. Pseudomonas
- C. Diplococcus pneumoniae
- D. Mycoplasmas
Explanation: The correct option is D: Mycoplasmas. These bacteria are distinctive in lacking a cell wall, which makes them naturally resistant to…
Correct answer: Mycoplasmas- A. Aerotolerant anaerobe
- B. Facultative anaerobe
- C. Obligate aerobe
- D. Obligate anaerobe
Explanation: Obligate anaerobes are organisms that cannot survive in the presence of oxygen as they lack the necessary enzymes to process it, making…
Correct answer: Obligate anaerobe- 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 region called the nucleoid
- D. All of these options are false
Explanation: Option A: All cells including bacteria 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 region called the nucleoid- A. Cilia
- B. Flagella
- C. Pili
- D. Pseudopodia
Explanation: The correct answer is Flagella. Flagella are the main organelles for motility in bacteria, allowing them to swim through liquid…
Correct answer: Flagella- A. Plasmid
- B. Nucleoid
- C. Mesosomes
- D. All of these
Explanation: Plasmids are small, circular, double-stranded DNA molecules that are separate from the bacterial chromosomal DNA, often harboring genes…
Correct answer: Plasmid- A. Gram-positive bacteria
- B. Gram-negative bacteria
- C. Chemo-synthetic bacteria
- D. None of the above
Explanation: Pili are filamentous structures primarily found on gram-negative bacteria.
Correct answer: Gram-negative bacteria