Question
Diphtheria is caused by
(a) Diphtheria is a serious disease caused by bacterium Corynebacterium diphtheriae. It commonly attacks mucous membrane of nose, throat and tonsils. The symptoms include high fever, sore throat, difficulty in breathing due to chocking.
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$R$ -The spermatids are transformed into spermatozoa by the process called spermiogenesis.
$I.$ In the centre of each I-band is an elastic fibre ($Z-$line) which bisects it
$II.$ Thin filament are firmly attached to the $Z-$line
$III.\;M-$line is a fibrous membrane in the middle of $A-$band
$IV.$ A sarcomere comprises one full$-A $ band and two half $I-$bands
