| A | B |
|---|
| Transcription requires that a pool of ___ ___ be available in the cell. | RNA nucleotides |
| The enzyme ___ ___ will catalyze the steps in transcription. | RNA polymerase |
| Somewhere in the DNA, the ___ for the needed protein is located. | Gene |
| As transcription begins, the DNA helix ____ and the 2 strands ____, just in the area of the gene. | Unwinds / separate (hydrogen bonds holding them together are broken) |
| The strand of DNA that contains the gene is called the ____ strand; the strand of DNA complementary to the gene is called the ___ strand. | Sense / antisense |
| RNA polymerase binds to the sense strand at a special site called the ____. | Promoter |
| Using the DNA as a ___, the enzyme links together one nucleotide at a time to form a strand of ____ complementary to the gene. | Template or pattern / mRNA |
| mRNA synthesis ends when the enzyme reaches a site at the end of the gene called the ___. | Terminator |
| The mRNA as it is synthesized directly from DNA can be called ____, because it contains both good information and "junk." | Pre-mRNA |
| Before mRNA leaves the nucleus, the "junk" sections, which are called ____, must be deleted and the good information, called ____, are spliced together. | Introns / exons |
| Removal of "junk" and splicing of good information is carried out by ____. | snRNP's (snurps) |
| When mRNA synthesis is complete, the complementary DNA strands ____ and the helix ____. | Reattach / rewinds |
| mRNA is synthesized in the ____ of the cell, but it must leave and go to a ___ to carry out its job. | Nucleus / ribosome |
| The first step in gene expression is called ____. | Transcription |
| In transcription, a strand of ____ is synthesized. | mRNA |
| Transcription occurs in the ___ of the cell. | Nucleus |
