Why is $Bt$ toxin not toxic to human beings?
- AThe toxin recognises only insect-specific targets.
- B$Bt$ toxin activation requires a temperature above the human body temperature.
- C$Bt$ toxin formation forms a pro-$Bt$ state which requires a $pH$ lower than the one present in the human stomach.
- DConversion of pro-$Bt$ to the active $Bt$ state takes place only in highly alkaline conditions.
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Golden rice
$I$. It is a transgenic variety of rice.
$II$. It contains a good quality of $\beta$-carotene (provitamin-$A$).
$III$. $\beta$-carotene is a principal source of vitamin-$A$.
$IV$. The grains of the rice are yellow in colour due to $\beta$-carotene. The rice is commonly called golden rice.
Which of the statements given above are correct?
$I$. It is a transgenic variety of rice.
$II$. It contains a good quality of $\beta$-carotene (provitamin-$A$).
$III$. $\beta$-carotene is a principal source of vitamin-$A$.
$IV$. The grains of the rice are yellow in colour due to $\beta$-carotene. The rice is commonly called golden rice.
Which of the statements given above are correct?
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