DNA Replication

Question 1

Stop Codons

Answer 1

UAA
UGA
UAG

Question 2

Features of Virus

Answer 2

DNA or RNA

Capsid/protein coat

Envelope (surrounds capsid)

Question 3

Episome

Answer 3

Found in some plasmids

Can be incorporated into bacterial chromosome

Question 4

F Plamsmid

Answer 4

Has genes that allow bacteria to make pilus (to connect to other bacteria)

Question 5

R Plasmid

Answer 5

Provide bacteria resistance againnst Ab

Question 6

Conjugation

Answer 6

DNA exchange between bacteria through pilus

Question 7

Transduction

Answer 7

New DNA introduced into genome by virus

Question 8

Transformation

Answer 8

Bacteria absorbs DNA from surrounding

Question 9

Operon

Answer 9

If bound by repressor protein, transcription stops

Question 10

Lac Operon

Answer 10

Controls breakdown of lactose (catabolic)

Lactose present- binds to active repressor

Repressor leaves operon

Transcription starts
Need lactose, no glucose

Question 11

Trp Operon

Answer 11

Controls synthesis of Trp (anabolic)

Repressor normally inactive and unbound

Trp present, acts as co-repressor and binds and activates repressor

Stops synthesis of Trp

Question 12

Methylation of histones

Answer 12

DNA tightly packed

Reduces transcription

Question 13

Acetylation of Histones

Answer 13

Uncoils DNA

Question 14

siRNA

Answer 14

Block transcription/translation or degrade mRNA