NEET PG/NEXT (MCQs)

2021-02-05 18:00:04 Explanation

Meningitis is the commonest intracranial complication of otitis media

In infants and children, otogenic meningitis usually follows acute otitis media while in adults, it is due to chronic middle ear infection

Most common organisms in infants and children are Streptococcus pneumonia(30%), H. infulenza (20%) and Moraxella catarrhalis (12%).

Streptococcus pneumoniae is also the most common cause of pyogenic meningitis in adults. Open / Comment

2021-02-04 18:00:04 Explanation

Rheumatoid arthritis leads to development of anemia of chronic disease

A more common presentation of anemia of chronic disease is normocytic normochromic anemia. In late presentation microcytic hypochormatic anemia is noted. Open / Comment

2021-02-03 18:00:04 Explanation

Creatinine is formed in muscle from creatinine phosphate by irreversible, non enzymatic dehydration and loss of phosphate

Glycine, arginine and methionine all participate in creatine biosynthesis

Synthesis of creatine is completed by methylation of guanidionoacetate by S-adenosylmethionine. Open / Comment

2021-02-02 18:00:04 Explanation

While still in the ovary, the ovum is in the primary oocyte stage

Right before it is released from the ovarian follicle, its nucleaus divides by meiosis and a first polar body is expelled from the nucleus of the oocyte

The primary oocyte then become the secondary oocyte

In this process, each of the 23 pairs of chromosomes loses one of its partners, which becomes incorporated in a polar body that is expelled

This leaves 23 unpaired chromosomes in the secondary oocyte. It is at this time that the ovum, still in the secondary oocyte stage, is ovulated into the abdominal cavity. Open / Comment

2021-02-01 18:00:04 Explanation

Notochord is formed by epiblast cells and it provides central axis to the embryonic disc.

It induces the overlying ectodermal cells to become neuro-ectodermal cells and form the neural tube. Open / Comment