The bacterium used in the production of Swiss cheese (for holes) is: MCQ with Answer and Explanation

The bacterium used in the production of Swiss cheese (for holes) is:
A. Lactobacillus acidophilus
B. Penicillium roqueforti
C. Propionibacterium shermanii
D. Streptococcus thermophilus
Answer: Option C
Solution (By JKSSB Mock Tests)
Propionibacterium shermanii ferments lactate to propionic acid, acetic acid, and CO₂ during cheese ripening; the CO₂ forms the characteristic holes (eyes) in Swiss cheese. Lactobacillus and Streptococcus are starter cultures for acid production, Penicillium roqueforti is used for blue cheese.

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Practice More Biology Questions

Question #1
The disease 'pellagra' is caused by the deficiency of:
A. Vitamin B₃ (Niacin)
B. Vitamin B₆ (Pyridoxine)
C. Vitamin B₂ (Riboflavin)
D. Vitamin B₁ (Thiamine)

Correct Answer: Option A


Explanation:
Pellagra, characterized by dermatitis, diarrhea, and dementia (3 Ds), is caused by a deficiency of niacin (vitamin B₃) or its precursor tryptophan. It is common in populations with corn-based diets lacking tryptophan. Beriberi is due to B₁ deficiency, cheilosis to B₂, peripheral neuropathy to B₆. Niacin is a component of coenzymes NAD and NADP.

This question belongs to: Science Biology
Question #2
Which organelle is primarily responsible for the detoxification of lipid-soluble drugs and toxins in liver cells?
A. Lysosome
B. Smooth Endoplasmic Reticulum
C. Golgi Apparatus
D. Rough Endoplasmic Reticulum

Correct Answer: Option B


Explanation:
The Smooth Endoplasmic Reticulum (SER) in liver hepatocytes contains enzymes like cytochrome P450 that detoxify lipid-soluble drugs, metabolic waste, and toxins by making them water-soluble for excretion. Rough ER is involved in protein synthesis, the Golgi apparatus in packaging and secretion, and lysosomes in intracellular digestion. Exam tip: SER is abundant in liver and adrenal cortex cells.

This question belongs to: Science Biology
Question #3
Which of the following is an example of a unicellular organism?
A. Paramecium
B. Earthworm
C. Hydra
D. Mushroom

Correct Answer: Option A


Explanation:
Paramecium is a unicellular ciliated protozoan found in freshwater. Earthworm and Hydra are multicellular animals, mushroom is a multicellular fungus. Unicellular organisms carry out all life processes within a single cell.

This question belongs to: Science Biology