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NEET MDS Quiz - Practice Test
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Practice Test

All Subjects - 3 Questions

1
Biochemistry
The biochemical defect in Osteogenesis Imperfecta, type II is:
1. a mutation in the alpha 1 chain of Type I collagen.
2. a deficiency in collagenase.
3.a deficiency in lysyl oxidase.
4.a deficiency in lysyl hydroxylase.

📝 Explanation:

The biochemical defect in Osteogenesis Imperfecta, type II is a deficiency in lysyl hydroxylase.

2
Oral Pathology
Thistle-tube appearance of pulp chamber is a feature of
1) Coronal dentin dysplasia
2) Regional odontodysplasia
3) Dentinogenesis imperfecta
4) Amelogenesis imperfecta

📝 Explanation:

Coronal dentin dysplasia is a genetic condition that affects the development of dentin, leading to abnormal pulp chamber morphology. The "thistle-tube" appearance refers to the shape of the pulp chamber, which resembles a thistle tube due to the constricted and elongated form of the pulp space. This condition is characterized by a normal crown appearance but with significant alterations in the pulp chamber and root canal system, making it distinct from other dental dysplasias.

3
Anatomy

Bell's palsy is:
1). UMN lesion of CN VII
2). LMN lesion of CN VII at stylomastoid foramen
3). Lesion of CN V
4). Lesion of CN IX

📝 Explanation:

Bell's palsy is an idiopathic LMN palsy of CN VII. The entire hemiface is affected, including the forehead.

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