Question

t always pairs with a in dna. when making mrna, a in dna pairs with ____ in rna
a a
b c
c g
d u
question 7
if the dna sequence is att gca, then the complementary sequence in mrna is _______________. blank 1
blank 1 add your answer
question 8
why does a cell need both mrna and trna in order to synthesize a protein.
a mrna is the ingredients that make up dna nucleotides and trna is the ingredients that make up rna nucleotides
b mrna is the recipe for a protein and trna brings the amino acids to the ribosome for assembly
c mrna is in dna and trna is in rrna
d because amino acids are the building blocks for dna

Explanation:

1. In transcription from DNA to mRNA, adenine (A) in DNA pairs with uracil (U) in RNA since RNA has uracil instead of thymine (T) which pairs with A in DNA. So for the first - multiple - choice question, the answer is U.
2. For the DNA sequence ATTGCA, following the base - pairing rules of transcription (A - U, T - A, G - C, C - G), the complementary mRNA sequence is UAACGU.
3. mRNA carries the genetic code (the "recipe") for making a protein from DNA to the ribosome. tRNA brings the appropriate amino acids to the ribosome for protein assembly.

Answer:

1. D. U
2. UAACGU
3. B. mRNA is the recipe for a protein and tRNA brings the amino acids to the ribosome for assembly