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messenger rna (mrna) molecules are long strands of rna nucleotides that are formed complementary to one strand of dna. they travel from the nucleus to the ribosome to direct the synthesis of a specific protein. ribosomal rna (rrna) is the type of rna that associates with proteins to form ribosomes in the cytoplasm. the third type of rna, transfer rna (trna) are smaller segments of rna nucleotides that transport amino acids to the ribosome.
transcription
the first step of the central dogma involves the synthesis of mrna from dna in a process called transcription (trans krihp shun). through transcription, the dna code is transferred from a strand of dna to mrna in the nucleus. the mrna then can take the code into the cytoplasm for protein synthesis. follow along with the process of transcription in figure 12. the dna is unzipped in the nucleus and rna polymerase, an enzyme that regulates rna synthesis, binds to a specific section where an mrna will be synthesized. as the dna strand unwinds, the rna polymerase initiates mrna synthesis and moves along one of the dna strands in the 3 to 5 direction. the strand of dna that is read by rna polymerase is called the template strand, and mrna is synthesized as a complement to the dna nucleotides. the dna strand not used as the template strand is called the nontemplate strand. the mrna transcript is manufactured in a 5 to 3 direction, adding each new rna nucleotide to the 3 end. uracil is incorporated instead of thymine as the mrna molecule is made. eventually, the mrna is released, and the rna polymerase detaches from the dna. the new mrna then moves out of the nucleus through nuclear pores into the cytoplasm.
get it?
explain the direction in which the mrna transcript is manufactured.
figure 12: rna is grown in the 5 to 3 direction.
identify which enzyme adds nucleotides to the growing rna.
crosscutting concept
structure and function our knowledge of protein synthesis has been gathered through extensive ongoing biochemical research. the evidence obtained from this research is the source of the information presented in this lesson. use this evidence to create a chart or table summarizing the functions of the main cellular structures involved in protein synthesis.
academic vocabulary
transfer
to pass from one thing or place to another
the process of transcription transfers the dna code to mrna in the nucleus.

Explanation:

The text states that the mRNA transcript is manufactured in a 5' to 3' direction, with each new RNA nucleotide added to the 3' end.

Answer:

The mRNA transcript is manufactured in a 5' to 3' direction.