A microbiologist used Gram staining method in a laboratory to identify different types of infectious bacteria in four different samples (I, II, III and IV). The given table shows the results.Based on given results, gram positive bacteria are found in samples:
Correct answer: D. II and III
- A. I
- B. IV
- C. I and IV
- D. II and III
Explanation
Gram staining is a method used to differentiate bacterial species into two groups based on the chemical and physical properties of their cell walls. Gram-positive bacteria retain the crystal violet stain and appear purple under a microscope. In this question, to identify which samples contain gram-positive bacteria, you must refer to the staining results. Samples II and III exhibit the characteristics of gram-positive bacteria, while Samples I and IV do not, as they are gram-negative, which shows a red-pink colour. Therefore, the correct answer is Sample II and III.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Kingdom Prokaryotae
Kingdom Prokaryotae includes bacteria and cyanobacteria, organisms with no membrane-bound nucleus or membrane-bound organelles. It covers their cell wall, capsule, flagella, plasmids, forms of nutrition, binary fission, useful and harmful roles, and the differences between prokaryotic cells and eukaryotic cells.
Practise Biodiversity and Variety of Life
3,130 free Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Kingdom Prokaryotae questions
Which of the following statements CORRECTLY describes the obligate anaerobic bacteria?
Escherichia coli is a facultative anaerobic bacterium because it can
The type of locomotion shown by bacteria towards carbon and energy sources is
A microbiologist used Gram staining method in a laboratory to identify different types of infectious bacteria in four different samples (I, II, III and IV). The given table shows the results.Based on the results of sample I and IV, he infers that the cell walls of Escherichia coli and Salmonella typhi have
The given diagram shows a phenomenon in bacteria.
Different methods of sterilisation are used to kill microorganisms.The method which kills the microorganisms by disrupting their DNA is