The mineral element essential for the synthesis of thyroid hormones is: MCQ with Answer and Explanation

The mineral element essential for the synthesis of thyroid hormones is:
A. Calcium
B. Zinc
C. Iron
D. Iodine
Answer: Option D
Solution (By JKExamLibrary)
Iodine is a key constituent of the thyroid hormones thyroxine (T₄) and triiodothyronine (T₃). Deficiency leads to goiter and hypothyroidism. Iron is for hemoglobin, calcium for bones, zinc for enzyme function. Iodized salt is a public health measure to ensure adequate iodine intake.

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Practice More Biology Questions

Question #1
The type of joint between the teeth and the jawbone is:
A. Synovial joint
B. Fibrous joint (gomphosis)
C. Cartilaginous joint
D. Suture

Correct Answer: Option B


Explanation:
A gomphosis is a specialized fibrous joint where a peg-like tooth fits into a socket in the jawbone, connected by the periodontal ligament. Sutures are between skull bones, synovial are movable, cartilaginous slightly movable.

This question belongs to: Science Biology
Question #2
In the human body, the 'Basal ganglia' are a group of subcortical nuclei located deep within the cerebral hemispheres. They are primarily involved in:
A. Processing visual information
B. Controlling the endocrine system
C. Regulating voluntary motor movements, procedural learning, and habit formation
D. Regulating the sleep-wake cycle

Correct Answer: Option C


Explanation:
The basal ganglia are a group of interconnected subcortical nuclei (including the caudate nucleus, putamen, globus pallidus, substantia nigra, and subthalamic nucleus) located deep within the white matter of the cerebral hemispheres. They are crucial components of the extrapyramidal motor system. Their primary functions are to regulate voluntary motor movements (by facilitating desired movements and inhibiting unwanted ones), procedural learning (learning by repetition), routine behaviors, and habit formation. Dysfunction of the basal ganglia leads to movement disorders like Parkinson's disease and Huntington's disease.

This question belongs to: Science Biology
Question #3
Which of the following microorganisms is used in the production of curd from milk?
A. Clostridium botulinum
B. Streptococcus pneumoniae
C. Salmonella typhi
D. Lactobacillus

Correct Answer: Option D


Explanation:
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This question belongs to: Science Biology