NAME:______________________PERIOD:_____DATE:________
Transcription
Directions: Fill in the blanks below with the correct term to complete the
statements.
Transcription is the process of making a _______________ strand from a portion of a
_______________ strand. RNA is _______________ _______________ and there
are 3 different types that help to build proteins. _______________ RNA brings
information from the DNA in the nucleus to the cytoplasm. _______________ RNA is
what ribosomes are made of and they clamp onto the mRNA and use its information to
assemble acids. _______________ RNA transports the _______________
_______________ to the ribosome to be assembled into a protein. RNA is different
from DNA in the following four ways:
1. RNA exists as a _______________ strand, where DNA is _______________
stranded
2. RNA contains the nitrogen base _______________ instead of
_______________ like in DNA.
3. RNA is made up of the sugar _______________, where DNA is made up of
the sugar _______________.
4. ________ can leave the nucleus and ________ can’t leave the nucleus.
Transcription begins when the enzyme _______________ _______________ “unzips”
the DNA. Free RNA nitrogen bases pair with complementary ________ nitrogen bases.
This new strand of RNA is called _______________ RNA. This strand breaks away
from the DNA and leaves the _______________ and enters the _______________.
Directions: For each DNA sequence below, write the complimentary mRNA
strand.
1.
T–A–C–A–C–A–A–C–A–C–C–A–T–A–A–T–T–T–A–T–C
mRNA
2.
T–A–C–A–C–A–C–C–A–T–A–A–C–G–A–A–A–A–A–T–T
mRNA
3.
T -A -C - G - T - A - C - C - G - T - T - A - G - G - C - A - T - T - G - A - C
mRNA
4.
T–A–C–G–C–A–A–T–G–C–C–A–T–T–C–A–T–G–G–T–C
mRNA
Directions: Answer the following questions completely.
5. What is the role of RNA polymerase in the transcription process?
6. In what 3 ways does the structure of RNA differ from the structure of DNA?
7. Why is the term transcription appropriate for describing the process of making RNA?
8. Why does transcription have to take place?