Question

match the dna --> mrna nitrogenous base sequence:
column a \t\t\t\t\tcolumn b

1. \tif dna has a t... \t\ta. mrna gets an a
2. \tif dna has a c... \t\tb. mrna gets a g
3. \tif dna has a g... \t\tc. mrna gets a u
4. \tif dna has a a... \t\td. mrna gets a c

Explanation:

To solve this, we use the base - pairing rules for transcription (DNA to mRNA). In transcription, adenine (A) in DNA pairs with uracil (U) in mRNA, thymine (T) in DNA pairs with adenine (A) in mRNA, cytosine (C) in DNA pairs with guanine (G) in mRNA, and guanine (G) in DNA pairs with cytosine (C) in mRNA.

1. For "If DNA has a T...", according to the rule, T pairs with A in mRNA. So it matches with option a.
2. For "If DNA has a C...", C pairs with G in mRNA. So it matches with option b.
3. For "If DNA has a G...", G pairs with C in mRNA. So it matches with option d.
4. For "If DNA has a A...", A pairs with U in mRNA. So it matches with option c.

Answer:

1. a. mRNA gets an A
2. b. mRNA gets a G
3. d. mRNA gets a C
4. c. mRNA gets a U