Question

select the correct answer.

a scientist isolated dna from a particular bacterium and decided to analyze it. the sequence of the bacterial dna is atggggctagtctt. what will the complementary strand be?

tacccgatcagtta
tacccgatcagaag
tacccgaggcgaa
tacaagatcagaag

Explanation:

Identify the given DNA sequence

The problem provides a single-stranded bacterial DNA sequence:
ATGGGCTAGTCTT

Apply complementary base pairing rules

Using our understanding of Nucleic Acids and Nucleotides, DNA bases pair specifically:

• Adenine (A) pairs with Thymine (T)
• Thymine (T) pairs with Adenine (A)
• Guanine (G) pairs with Cytosine (C)
• Cytosine (C) pairs with Guanine (G)

Determine the complementary sequence

We translate each base of the original sequence ATGGGCTAGTCTT one by one:

• A $

ightarrow$ T

• T $

ightarrow$ A

• G $

ightarrow$ C

• G $

ightarrow$ C

• G $

ightarrow$ C

• C $

ightarrow$ G

• T $

ightarrow$ A

• A $

ightarrow$ T

• G $

ightarrow$ C

• T $

ightarrow$ A

• C $

ightarrow$ G

• T $

ightarrow$ A

• T $

ightarrow$ A

Combining these gives: TACCCGATCAGAA

Match with the given options

Let's compare our result TACCCGATCAGAA with the choices:

• Option 1: TACCCGATCAGTTA (Incorrect)
• Option 2: TACCCGATCAGAA (Correct)
• Option 3: TACCCGAGGCGAA (Incorrect)
• Option 4: TACAAGATCAGAA (Incorrect)

Answer:

• TACCCGATCAGTTA
• TACCCGATCAGAA (Correct answer)
• TACCCGAGGCGAA
• TACAAGATCAGAA