DNA4

Question 1

What transcribes DNA into mRNA?

Answer 1

RNA polymerase

Question 2

What is the ‘D-loop’?

Answer 2

The loop formed during transcription in which a ssDNA strand and its complimentary mRNA strand form a double helix

Question 3

Why do TATA regions unwind first for replication?

Answer 3

the TA is easier to unstack and unstacking preceeds unpairing

Question 4

Name the 5 shapes of DNA minicircles you can get when you apply negative twist.

Answer 4

Curved, Racquet, Handcuff, Needle, Rod

Question 5

Name the two shapes of DNA minicircles you can get when you apply positive twist

Answer 5

Curved, “8” shape

Question 6

Redundancies in the genetic code can be ….. specific.

Answer 6

species

Question 7

What cuts introns (mRNA) at specific splice sites?

Answer 7

Ribozymes

Question 8

What are lariats?

Answer 8

circular mRNA introns that were cut out

Question 9

What are self-complementary regions of RNA that form secondary structures called?

Answer 9

stem-loops

Question 10

What two nucleosides are unique to RNA?

Answer 10

Ribothymidine and pseudouridine

Question 11

Draw ribothyminidine

Answer 11

Slide 30, DNA4

Question 12

Draw pseudouridine

Answer 12

slide 30, DNA4

Question 13

What types of things form at domain junctions in t-RNA?

Answer 13

uncommon nucleotide parings and triplets

Question 14

Inosine is a very versatile ….. ……

Answer 14

hydrogen bonder

Question 15

What is required for tRNA to fold?

Answer 15

Mg2+

Question 16

Where do mRNA’s hold onto the tRNA’s?

Answer 16

the anticodon triplet

Question 17

For synthesis to occur in tRNA’s what does the ribosome have to hold?

Answer 17

an activated amino acid

Question 18

What RNA is in charge of gene silencing; silencing RNA?

Answer 18

RNAi (RNA interference)

Question 19

What does RNAi intiate?

Answer 19

Chromatin silencing