True or false: in the sequence aggcct, an available phosphate group would be found at the 5' end of the nucleotide labeled "t."

The answer is false.

an available phosphate group would be found at the 5' end of the nucleotide labeled A. The 5′-end of a DNA contains a phosphate group that is  attached to the 5′ carbon of the ribose ring and that A phosphate group  permits ligation of two nucleotides ( phosphodiester bond).

your answer should be c) enjoy!