Question

replication
untipped
single strand of dna
complementary strand
of dna
t
g
c
t
a
g
a
c
c
a
build the complementary
strand of dna to this
single strand that has
unzipped during replication...
drag

Explanation:

Step1: Recall DNA base pairing rules

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). So for each base on the single - stranded DNA, we find its complementary base.

• For the base T (on the single strand), the complementary base is A.
• For the base G (on the single strand), the complementary base is C.
• For the base C (on the single strand), the complementary base is G.
• For the base T (on the single strand), the complementary base is A.
• For the base A (on the single strand), the complementary base is T.
• For the base G (on the single strand), the complementary base is C.
• For the base A (on the single strand), the complementary base is T.
• For the base C (on the single strand), the complementary base is G.
• For the base C (on the single strand), the complementary base is G.
• For the base A (on the single strand), the complementary base is T.

Step2: Match the complementary bases with the given options

Looking at the options on the right (the molecules to drag), we need to select the correct base - paired molecules. For example, when the single - strand base is T, we need to drag the molecule with A to pair with it; when the single - strand base is G, we drag the molecule with C, and so on.

Answer:

To build the complementary strand:

• For the T on the single strand, use the molecule with A (the blue - colored A - containing molecule).
• For the G on the single strand, use the molecule with C (the yellow - colored C - containing molecule? Wait, no, correction: G pairs with C, so the molecule with C (yellow) pairs with G (red)? Wait, no, the base - pairing is A - T and C - G. So the red - colored G on the single strand pairs with the yellow - colored C? Wait, the single - strand has bases: T (purple - labeled), G (red - labeled), C (yellow - labeled), T (purple - labeled), A (blue - labeled), G (red - labeled), A (blue - labeled), C (yellow - labeled), C (yellow - labeled), A (blue - labeled).

So the complementary bases should be:

• T (single) → A (blue - A molecule)
• G (single) → C (yellow - C molecule)
• C (single) → G (red - G molecule)
• T (single) → A (blue - A molecule)
• A (single) → T (purple - T molecule)
• G (single) → C (yellow - C molecule)
• A (single) → T (purple - T molecule)
• C (single) → G (red - G molecule)
• C (single) → G (red - G molecule)
• A (single) → T (purple - T molecule)

So the correct way is to drag the appropriate molecules (based on base - pairing) to each position. For example, the first blank (next to T) gets the A - containing molecule (blue A), the second blank (next to G) gets the C - containing molecule (yellow C), the third blank (next to C) gets the G - containing molecule (red G), and so on.