Question

which of the following are correct regarding dna probes?
choose all that apply
a they are used in pcr reactions to copy the dna.
b they are complementary to the sequence of nucleotides in the gene of interest.
c they help researchers clone dna in bacterial cells.
d they are used in dna microarrays.

Explanation:

• Option a: PCR uses primers, not DNA probes, to copy DNA.
• Option b: DNA probes are designed to be complementary to the target gene sequence to bind specifically.
• Option c: DNA cloning in bacteria uses vectors like plasmids, not DNA probes.
• Option d: DNA microarrays use fixed DNA probes to hybridize with sample DNA/RNA for gene expression analysis.

Answer:

b. They are complementary to the sequence of nucleotides in the gene of interest.
d. They are used in DNA microarrays.