MCQ
$PCR$ is used to
- ADetect $HIV$ in suspended $AIDS$ patients
- BDetect mutations in the genes in suspended cancer patients
- CDiagnose many genetic disorders
- ✓All of the above
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Assertion $A$ : Late wood has fewer xylary elements with narrow vessels.
Reason $R$ : Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below :

Statement $I$:The primary $CO _{2}$ acceptor in $C _{4}$ plants is phosphoenolpyruvate and is found in the mesophyll cells.
Statement $II:$Mesophyll cells of $C _{4}$ plants lack RuBisCo enzyme.
In the light of the above statements, choose the correct answer from the options given below: