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$R$ : This enzyme remain active during the high temperature including denaturation of double stranded $DNA$.

$I.$ Primary and secondary phloem gets crushed during secondary growth
$II.$ During secondary growth, primary xylem remains more or less intact
$(i)$ Neurospora, which is used in biochemical and genetic work is a member of this class.
$(ii)$ They are mostly multicellular, e.g., Yeast, or rarely unicellular, e.g., Penicillium.
$(iii)$ They are saprophytic, decomposers, parasitic or coprophilous.
$(iv)$ Some examples are Aspergillus, Claviceps and Neurospora.
$I$. water souble
$II$.water insoluble
$III$. some lipids have phosphorous
$IV$. found in only cell membrane
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