Bacteria | MCQs

Explanation

Penicillin works best on gram-positive bacteria by inhibiting peptidoglycan production, making the cells leaky and fragile

The cells burst open and are much easier for the immune system to break down, which helps the sick person heal more quickly.

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Related Question

Penicillin was discovered by Alexander Flaming In 1928

Penicillin was the first true antibiotic

Explanation

Lipid-rich components of bacterial cells present in the bacterial membrane.

Bacterial membranes present a large diversity of amphiphilic lipids.

Explanation

In June 2022, researchers discovered largest bacteria on the Caribbean island of Guadeloupe and is big enough to be seen with the human eye

Explanation

• In bacterial cells, the DNA is found floating in the cytoplasm, rather than being enclosed in a membrane-bound nucleus like in eukaryotic cells.
• This region of the cytoplasm where the DNA is found is called the nucleoid.

Explanation

Diarrhea and typhoid are caused by bacterial infections:

• Diarrhea can be caused by various bacteria, such as E. coli, Salmonella, Shigella, and Campylobacter.
• Typhoid is caused by the bacterium Salmonella Typhi (S. Typhi).

Explanation

• Yogurt is made by adding a bacterial culture, typically Lactobacillus bulgaricus and Streptococcus thermophilus, to milk.
• These bacteria ferment the lactose (milk sugar) in the milk.
• It producing lactic acid and causing the milk to curdle and thicken, resulting in yogurt.

Explanation

• Escherichia coli (E. coli) is a type of bacterium.
• It is commonly found in the gut of humans and animals.
• It plays a important role in the digestive process.