8.4: Protein Synthesis, transcription+splicing Flashcards

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1
Q

Transcription

A

Process of making pre-mRNA using part of the DNA as a template

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2
Q

How are nucleotide bases exposed

step 1

A

An enzyme acts on the specific region of the DNA causing the two strands to separate = nucelotide bases exposed

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3
Q

Template strand

step 2

A

(The nucleotide bases on one of the two DNA strands)

pair with complementory nucleotides from the pool in the nucleus

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4
Q

Role of RNA polymerase

step 3

A

joins the nucleotides together - pre mRNA molecule

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5
Q

pre-mRNA

step 4

A

as pre-mRNA strand is made

the DNA rejoins behind it

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6
Q

stop triplet code

step 5

A

When the RNA polymerase reaches the stop triplet code, it detaches = pre mRNA complete

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7
Q

Splicing

of pre-mRNA

A

the removal of intervening introns and the joining exons
= mRNA
mRNA molecules leave through nuclear pores

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8
Q

Exons

A

code for protein

useful

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9
Q

Introns

A

prevent synthesis of a polypeptide and intervene

not useful

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10
Q

No splicing occurs in …

why

A

prokaryotes as there are no introns in prokaryotic DNA

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