Download App

STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
A $DNA$ molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of $DNA$ molecules that contain some radioactive thymidine after three duplications
  • A
    There will be four such molecules
  • B
    There will be eight such molecules
  • C
    There will be only one such molecule
  • ✓
    There will be two such molecules
✓

Answer

Correct option: D.
There will be two such molecules
d
(d)Because of semiconservative method of $DNA$ replication only $2$ molecules of $DNA$ will have some radioactive thymidine.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from STD 12 - 5. molecular basis of inheritance→STD 12 - 5. molecular basis of inheritance — all question types→Biology STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Both husband and wife have normal vision though their fathers were colourblind and mothers did not have any gene for colour blindness. The probability of their daughter becoming colourblind is
→
The $LH$ surge from the anterior pituitary gland:
→
Regulatory proteins are the accessory proteins that interact with $\text{RNA}$ polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein?
→
In angiosperms pollen tubes liberate their male gametes into the.
→
Statins, a bioactive molecule, inhibits the enzyme responsible for synthesis of:
→
Seminiferous tubules are composed of:
→
Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.
→
Bamboo plant is growing in a far forest then what will be the trophic level of it?
→
The father has blood group $AB$ and mother $‘O'$. The child is supposed to have which of the following bloodgroups
→
$A$ - amp$^R$ has recognition sites for Pvu $I$.

$R$ - tet$^R$ gene has not recognition site for Hind $III$.

→