Arrange the following in the proper sequence in which they occur during a single PCR cycle. 1. Addition of DNA nucleotides by Taq polymerase 2. Complementary base pairing between primers and target DNA 3. Heat separation of strands of target DNA

Explanation:

PCR is the process of DNA duplication in vitro. We can make millions of copies of DNA in a very short period.

PCR completed in three steps;  as in question these are

Step 1: Denaturation; Heat separation of strands of target DNA.

Step 2: Annealing; as complementary base pairing between primers and target DNA.

Step 3: Extension; Addition of DNA nucleotides by Taq DNA polymerase.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]