MCQ
The letter 'T' in T-lymphocyte refers to:
- AThyroid
- BThalamus
- CTonsil
- DThymus
Explanation:
T- cell (also called T lymphocyte), is a type of leukocyte that is an essential part of the immune system. 'T' cells originate in the bone marrow and mature in the thymus. In the thymus, T cells multiply and differentiate into helper, regulatory, or cytotoxic T cells. They are then circulated in the blood or lymphatic system. Hence, the letter 'T' means thymus gland.
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$(i)$ Mesosome is formed by the extensions of plasma membrane into the cell.
$(ii)$ The pili are elongated tubular structures made up of a protein.
$(iii)$ Flagellum is composed of filament, hook and basal body.
$(iv)$ Ribosomes are about $30\; nm$ by $50\; nm$ in size.