ICSE Class 10 Molecular Basis of Inheritance — Mock Test

Free online mock test for Molecular Basis of Inheritance (ICSE Class 10 Botany) — 87 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.In the Hershey-Chase experiment, after blending and centrifugation, radioactivity was found inside bacteria infected with 32P-labelled phages but not with 35S-labelled phages. This shows that:
   • A.DNA, not protein, enters the bacterium and is the genetic material
   • B.Protein enters the bacterium and is the genetic material
   • C.Both DNA and protein enter the bacterium
   • D.Neither DNA nor protein enters the bacterium
2. 2.A transcription unit in DNA is primarily defined by three regions: a promoter, a structural gene, and a:
   • A.Terminator
   • B.Operator
   • C.Replicon
   • D.Centromere
3. 3.Which set represents the three stop (terminator) codons?
   • A.UAA, UAG, UGA
   • B.AUG, GUG, UUG
   • C.UUU, UUC, UUA
   • D.AAA, GGG, CCC
4. 4.If a double-stranded DNA has 20 per cent cytosine, what is the percentage of adenine in the DNA?
   • A.30 per cent
   • B.20 per cent
   • C.40 per cent
   • D.60 per cent
5. 5.If E. coli (dividing every 20 minutes) labelled with 15N is grown in 14N medium for 80 minutes, the proportion of light to hybrid density DNA would be:
   • A.7 light : 1 hybrid
   • B.1 light : 1 hybrid
   • C.3 light : 1 hybrid
   • D.All hybrid