Class switch recombination of B-cell that is generated upon recognition of protein antigens and requires the participation of_____

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#Question id: 11299

#XL - R Botany

Carbon is initially incorporated into the food chain by _____________

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#Question id: 567

#XL - Q Biochemistry

Penicillin and related drugs inhibit the enzyme; this enzyme is produced by 

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#Question id: 416

#XL - R Botany

The immediate precursors of DNA and RNA synthesis in the cell all contain:

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#Question id: 19642

#XL - P Chemistry

Molecular mass of volatile substance is determined by

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#Question id: 11557

#XL - T Zoology

Which of the following has both endocrine and exocrine activity?