The bacterium that converts milk into yogurt is: MCQ with Answer and Explanation

The bacterium that converts milk into yogurt is:
A. Escherichia coli
B. Streptococcus thermophilus
C. Bacillus cereus
D. Salmonella enterica
Answer: Option B
Solution (By JKSSB Mock Tests)
Streptococcus thermophilus and Lactobacillus bulgaricus are used as starter cultures in yogurt production. They ferment lactose to lactic acid, causing milk proteins to coagulate, giving yogurt its thick texture and tangy taste. Bacillus cereus causes food poisoning, E. coli can be pathogenic, Salmonella causes typhoid.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
The type of tissue that supports and binds other tissues is:
A. Epithelial tissue
B. Nervous tissue
C. Connective tissue
D. Muscle tissue

Correct Answer: Option C


Explanation:
Connective tissues (bone, cartilage, blood, adipose) provide structural framework, support, and bind organs. Epithelial covers surfaces, muscle enables movement, nervous conducts impulses.

This question belongs to: Science Biology
Question #2
The type of muscle tissue that is voluntary and striated is:
A. Visceral muscle
B. Cardiac muscle
C. Smooth muscle
D. Skeletal muscle

Correct Answer: Option D


Explanation:
Skeletal muscle is attached to bones, is under voluntary control, and has a striated appearance due to the arrangement of actin and myosin filaments. Smooth muscle (visceral) is non-striated and involuntary, found in internal organs. Cardiac muscle is striated but involuntary, found only in the heart. Skeletal muscles are multinucleated.

This question belongs to: Science Biology
Question #3
During which phase of the cell cycle does the centrosome duplicate?
A. G2 phase
B. M phase
C. G1 phase
D. S phase

Correct Answer: Option D


Explanation:
The centrosome, which contains two centrioles, duplicates during the S phase of the cell cycle, concurrent with DNA replication. This ensures that by the time the cell enters mitosis, it has two fully formed centrosomes to organize the mitotic spindle. G1 is for growth, G2 is for preparation for M phase, and M phase is for actual division.

This question belongs to: Science Biology