RNA & Transcription Flashcards Preview

Biology 101 > RNA & Transcription > Flashcards

Flashcards in RNA & Transcription Deck (26)
Loading flashcards...
0

Types of RNA are..

mRNA - Messenger RNA ((5% of cellular RNA))
tRNA - Transfer RNA ((21% of cellular RNA))
rRNA - Ribosomal RNA ((72% of cellular RNA))

1

Define Polyribosome..?

Multiple ribosomes using the same blueprint simultaneously.

2

Name the 3 Transcription parts..

1. Initiation
2. Elongation
3. Termination

3

Define Initiation

Proteins that recognize specific DNA sequences & Initiate transcription.
allow cells to pick out which genes will be transcripted

4

What do Enhancers do?

Enhance or promote the transcription.

5

What do Inhibitors do?

Block transcription

6

What is RNA Polymerase?

Similar to DNA Polymerase but requires less help
NO primase, liquase, helicase, gyrase.

7

What is Elongation?

RNA Polymerase create an RNA transcript only uses 1 strand of
DNA -> coding strand.

8

Name the two types of Protein Termination

1. Protein Dependent
2. Protein Independent

9

Protein Dependent is..

Rho protein terminator.
Binds to DNA & physically stops polymerase. "road block"

10

Protein Independant

RNA transcription itself stops transcription
folds up & pulls itself free of polymerase

11

RNA Processing

Bacteria, termination is the end.
often times ribosomes begin translation while the mRNA is still being made.

12

What are Operons ?

Groups of genes transcribed as one giant product, then cut into individual pieces.

13

What are Introns?

Sequences that don't belong in the protein.

14

What are Exons?

Sequences that do belong in the protein.

15

After processing the mRNA is shuttled where?

To the Cytoplasm

16

What is a stop codon?

3 possible codon
no amino acid associated w/ them
terminates translation

17

What is a Anti-Codon?

Part of the tRNA that recognizes the codon of the mRNA

18

What is the A site?

tRNA cells enter.

19

What is the P site

Amino acids link together

20

What is the E site

Empty tRNA's are spit out

21

What happens in termination?

stop codon brings an enzyme called a release factor in
free the protein

22

What are the two types of mutations?

1. Spontaneous Mutations
- Occur randomly

2. Induced Mutations
- Environmentally factors induce.

23

What are Mutagens?

Known to chemically alter nucleotides

24

What are Carcinogens?

Mutagens that typically result in cancer

25

What are Teratogens

Mutagenic to developing organisms