Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

While an mRNA strand is being translated in the ribosome subunit, the triplets in sequence were UAC and UAG. One of them codes for tyrosine. What is the significance of the other? Pick out the codon and specify.

What are called those segments of a hn-RNA which do not take part in protein synthesis?

It was confirmed by a doctor that the immune system of a person's body has been blocked. Which disease does the person have and what is its cause?

The transgenic animals are those which have __________________:

1. Foreign DNA in some of its cells
2. Foreign DNA in all its cells
3. Foreign DNA and RNA in some of its cells
4. Foreign DNA and RNA in all its cells

All terminater codons begin with nucleotide of which base?

Expand PAR.

Write the two specific codons that a translational unit of mRNA is flanked by, one on its either sides.

Directions: In the following questions, the Assertions (A) and Reason(s) (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: PCR can detect very low amounts of DNA and is now routinely used to defect HIV in suspected AIDS patient.
Reason: PCR is a powerful technique to identify many other genetic disorders.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

If the sequence of one stand of DNA is as follow:
5'-AAGTTACTAGAC-3
Write the sequence of mRNA framed from this DNA.

What is the linkage between nitrogenous base and pentose sugar called?