DNA Structure And Replication

Question 0

Who demonstrated DNA acts as the genetic material using T2 bacteriophage?

Answer 0

Hershey and chase

Question 1

Components of chromosomes?

Answer 1

Nuclei acids and proteins

Question 2

The radioactive isotope 32P labeled which component do the T2 bacteriophage

Answer 2

DNA

Question 3

Radioactive isotope 35s labeled which component of the t2 bacteria phage

Answer 3

Protein coat

Question 4

DNA strands running anti parallel is when

Answer 4

When one strand runs 5’-3’ and one runs 3’-5’

Question 5

Because of the 2nM width of the DNA double helix only a ______ base can pair with a _____base

Answer 5

Purine, pyrimidine

Question 6

____NA is double stranded ___NA is single stranded

Answer 6

D, R

Question 7

Difference in sugar of DNA and RNA?

Answer 7

DNA has 2 oxygen atoms in the sugar, RNA has 3 in the sugar

Question 8

Purines?

Answer 8

Guanine, adenine

Question 9

Pyrimidines?

Answer 9

Cytosine, thyamine, uracil.

Question 10

In a nucleotide the nitrogenous base is attached to the sugars____carbon and the phosphate group is attached to the sugars ____carbon?

Answer 10

1’ 5’

Question 11

Nucleic acids are assembled in the ___ to ___direction.

Answer 11

5’ 3’

Question 12

Which enzyme joins short segments (Okazaki fragments) into a continuous strand?

Answer 12

Ligase

Question 13

Product of DNA replication

Answer 13

2 new double helices each consisting one old and one new DNA strand

Question 14

The 1st step in DNA replication is catalyzed by what enzyme?

Answer 14

Helicase

Question 15

The action of helicase creates?

Answer 15

Replication forks and replication bubbles

Question 16

Why is the new DNA strand complementary to the 3’ 5’ strand assembled in short segments?

Answer 16

DNA polymerase can only be assembled in the 5’3’ direction

Question 17

The synthesis of a new DNA strand always begin with the synthesis of

Answer 17

A short RNA primer complementary to a preexisting DNA strand

Question 18

What is responsible to catalyzing the formation of an RNA primer

Answer 18

RNA Pol (primase)

Question 19

What catalyzes synthesis of new DNA strands?

Answer 19

DNA polymerase

Question 20

What stabilizes separated DNA strands during replication

Answer 20

Single-strand binding protein

Question 21

An old DNA strand is used as a ____ for the assembly of a new DNA strand?

Answer 21

Complimentary template.

Question 22

Weakest bonds in a DNA molecule are between?

Answer 22

Base to base

Question 23

What type of bonds hold together the sugar phosphate backbone of DNA

Answer 23

Covalent

Question 24

In DNA replication the leading strand_____

Answer 24

Is replicated into the replication fork in the 5’ 3’ direction

Question 25

The lagging strand is replicated..?

Answer 25

Out from the replication fork

Question 26

The energy required to catalyze nucleotide addition during DNA replication is derived from?

Answer 26

Nucleoside triphosphates

Question 27

Who’s proposed model of DNA is still used?

Answer 27

Watson and crick

Question 28

The enzyme that reduces the stress cause by opening the double helix is called

Answer 28

Gyrase

Question 29

After the formation of a replication bubble, what is he correct sequence of enzyme use for synthesis of the lagging DNA strand?

Answer 29

Helicase, primase, DNA polymerase, ligase