If a DNA strand has the base sequence TCAGTA, what would its complementary DNA sequence be?

If a DNA strand has the base sequence TCAGTA, what would its complementary DNA sequence be?

• A. AGTCAT
• B. CGTACA
• C. TGACAT
• D. TCAGTA

Answer: (A)

The complementary DNA sequence is determined by pairing each base with its specific counterpart according to the base pairing rules: adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). In the given DNA strand with the base sequence TCAGTA, each base is paired as follows: - T (thymine) pairs with A (adenine) - C (cytosine) pairs with G (guanine) - A (adenine) pairs with T (thymine) - G (guanine) pairs with C (cytosine) - T (thymine) pairs with A (adenine) - A (adenine) pairs with T (thymine) Thus, the complementary sequence to TCAGTA would be: - T -> A - C -> G - A -> T - G -> C - T -> A - A -> T Putting it all together, you get AGTCAT as the complementary DNA sequence. This demonstrates how the rules of base pairing are fundamental to understanding DNA replication and sequencing.

The complementary DNA sequence is determined by pairing each base with its specific counterpart according to the base pairing rules: adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).

In the given DNA strand with the base sequence TCAGTA, each base is paired as follows:

• T (thymine) pairs with A (adenine)

• C (cytosine) pairs with G (guanine)

• A (adenine) pairs with T (thymine)

• G (guanine) pairs with C (cytosine)

• T (thymine) pairs with A (adenine)

• A (adenine) pairs with T (thymine)

Thus, the complementary sequence to TCAGTA would be:

• T -> A

• C -> G

• A -> T

• G -> C

• T -> A

• A -> T

Putting it all together, you get AGTCAT as the complementary DNA sequence. This demonstrates how the rules of base pairing are fundamental to understanding DNA replication and sequencing.