CBSE Class-12 Exam 2018 : Marking Scheme

Question Paper, Biotechnology

CBSE Class-12 Exam 2018 : Biotechnology

BIOTECHNOLOGY-045

Marking Scheme/99

Q1. Cell growth inhibited when in contact with other cells/wall of the container. (1)

Q2. Van der Waals forces are important in macromolecules such as proteins because the large surface areas involved can result in reasonably large total forces/Several Van der Waals forces together give rise to stronger force. (1)

Q3. Bacterial cells scatter light in proportion to their concentration giving rise to high turbidity/absorbance/optical density. (1)

Q4. Reverse transcriptase is required to convert unstable m RNA to stable c DNA. (1)

Q5. Growth retardant. (1)

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Courtesy: CBSE