Question

. In a double-stranded DNA molecule, one of the chains has the sequence CCCATTCTA when read from the 5′ to the 3′ end. Indicate true (T) and false (F) statements below regarding this chain. Your answer would be a four-letter string composed of letters T and F only, e.g. TTFT.

( T ) The other chain is heavier, i.e. it has a greater mass.
( T ) There are no C residues in the other chain.
( F ) The 5′-terminal residue of the other chain is G.
( F ) The other chain is pyrimidine-rich.

Answer 1

The complementary strand to the given DNA sequence CCCATTCTA is GGTAAGATG. The other chain is not pyrimidine-rich and contains C residues. The statement that the other chain is heavier is true.

Step-by-step explanation:

The complementary strand to the given DNA sequence CCCATTCTA is GGTAAGATG. Therefore, the 5'-terminal residue of the other chain is G, which makes the statement false. Additionally, the other chain is not pyrimidine-rich as it contains both adenine (A) and guanine (G) bases, which are purines. Therefore, the statement that the other chain is pyrimidine-rich is false. However, the statement that the other chain is heavier, i.e., it has a greater mass, is true as the bases in DNA have different molecular weights. Finally, the statement that there are no C residues in the other chain is false because the complementary strand will contain C residues where the original strand has G residues and vice versa.