Question

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Q. Which one of the following is the correct matching of three items and their grouping category ?





Items



Group



(1) Cytosine, uracil, thiamine

-

Pyrimidines



(2) Malleus, incus, cochlea

-

Ear ossicles



(3) Ilium, ischium, pubis

-

Coxal bones of
pelvic girdle



(4) Actin, myosin, rhodopsin

-

Muscle proteins

Answer 1

Answer:

1. The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan.

2. The middle ear contains three tiny bones known as the ossicles: malleus, incus, and stapes. ... The ossicles are classically supposed to mechanically convert the vibrations of the eardrum, into amplified pressure waves in the fluid of the cochlea (or inner ear) with a lever arm factor of 1.3.

3.