Question

In an experiment, a scientist makes a radioactively labeled probe using human DNA. She then discovers that the probe hybridizes to a small segment of DNA isolated from a plant. What can she conclude from her results? A.The plant might have a gene that is similar to a human gene. B.The wrong method was used to detect radioactively labeled DNA. C.A plant cell has a cell wall, whereas a human cell does not. D.Plant DNA was accidentally used as a template to make the probe.

Answer 1

Answer: The correct answer is- A.The plant might have a gene that is similar to a human gene.

Probe can be described as the segment of DNA or RNA (generally 100-1000bp in length) that is designed and radioactively labelled to detect the presence of nucleotide sequences, which are complementary to it.

In this question, the probe is synthesised using sample of human DNA but it also hybridizes with the plant DNA.

This indicates that plant genome has certain DNA sequence or gene that is similar to the gene in the human DNA.

Thus, option A) is the right answer.

Answer 2

I believe the possible correct choice is A.