MIC | MCQs

Explanation

Explanation

 Gram-positive bacteria stain purple or blue with the Gram stain.

This is due to their thick peptidoglycan cell wall, which retains the primary stain (crystal violet) even after decolorization. 

Explanation

Bacteriophages are viruses that infect bacteria and are typically much smaller than other viruses like adenoviruses.

While adenoviruses range in size from 70-90nm, bacteriophages can be as small as 20nm. 

Explanation

Bacteria are single-celled microorganisms that can exist in various environments, including the human body.

They can be both beneficial (like in digestion) or harmful (causing infections).

Explanation

Cholera is caused by the bacterium Vibrio cholerae, which affects the small intestine and leads to severe diarrhea and dehydration.

The disease is primarily transmitted through contaminated water or food.

It can cause outbreaks in areas with poor sanitation.

Explanation

Explanation

Explanation

Cilia and flagella have a characteristic "9+2" arrangement of microtubules: nine outer pairs and two central single tubules.

Explanation

Sir Alexander Fleming noticed that a mold called Penicillium notatum accidentally grew in one of his petri dishes and killed the surrounding Staphylococcus bacteria

Penicillin was discovered by Alexander Flaming In 1928.

Penicillin was the first true antibiotic.

The first patient Albert Alexander, a 43-year-old policeman, was treated with penicillin on 12 February 1941.

Alexander Flaming determined that penicillin had an antibacterial effect and published his findings in 1929.

Explanation

During infection, fungi typically penetrate plant tissues through Stomata

Fungi often enter plant tissues through natural openings like stomata, which are small pores on the surface of leaves.