DNA lecture 3

Question 1

When was initial DNA discovery

Answer 1

1869

Question 2

How many strands coil around each other

Answer 2

2

Question 3

What does that those strands form

Answer 3

Double helix

Question 4

What is between the pairs

Answer 4

Bonds

Question 5

How many bases does dna have

Answer 5

4

Question 6

Function of DNA

Answer 6

responsible for passing genetic information
Larger molecule carries lots of information
Stable - due to many hydrogen bonds
Base sequence -allows information to be stored and base sequence code for amino acids
Weak hydrogen bonds
Double stranded- replication can occur semi conservatively
Compact - helix
Double helix -provides stability , protect bases , hydrogen bonds

Question 7

What is semi conservative replication

Answer 7

2 dna molecules consists of one original strand and one newly synthesised strand

Question 8

What type of molecule is it

Answer 8

Large

Question 9

Shape

Answer 9

Helixed /coiled and compact

Question 10

What does base sequence allow

Answer 10

Information to be stored and base sequence code for amino acids

Question 11

What type of hydrogen bonds

Answer 11

Weak

Question 12

Shape of prokaryotes

Answer 12

Small ,circular , not associated with proteins

Question 13

Shape of eukaryotes

Answer 13

Long
Thin
Associated with proteins (histones)

Question 14

In eukaryotic cells what is DNA stored as

Answer 14

Chromosomes in nucleus

Question 15

How many pairings do humans have

Answer 15

23

Question 16

What are homologous pairs

Answer 16

Same gene and same size

Question 17

What are DNA and RNA

Answer 17

Nucleic acids

Question 18

What do they have in them

Answer 18

Pentose sugar
Phosphate group
And nitrogenous base

Question 19

What is a nitrogenous base

Answer 19

Purines and pyrimidines

Question 20

What is the double helix held by

Answer 20

Hydrogen bases

Question 21

Is the hydrogen bases parallel or anti parallel

Answer 21

Anti parallel

Question 22

Is the hydrogen bases parallel or anti parallel

Answer 22

Anti parallel

Question 23

What are the pairs

Answer 23

Adenine -thymine
Cytosine -guanine

Question 24

What are bases pyrimidines

Answer 24

Cytosine
Thymine
Uracil

Question 25

What bases are purines

Answer 25

Adenine Guanine

Question 26

What reaction is between a polynucleotide

Answer 26

Condensation

Question 27

What reaction is between a polynucleotide

Answer 27

Condensation

Question 28

What is the chain of phosphate and sugar known as

Answer 28

Sugar phosphate backbone

Question 29

How many nucleotide bases Paris in turn of dna helix

Answer 29

10

Question 30

Structure of dna

Answer 30

RNA and DNA are nucleic acids Store genetic information Have a pentose sugar , nitrogenous base and phosphate group Double helix - antiparallel

Question 31

what is RNA

Answer 31

single sugar - phosphate backbone Has ribose sugar Has uracil Shorter

Question 32

The structure of polynucleotide

Answer 32

Condensation reaction Phosphate and sugar Phosphodiester bond 10 nucleotide base pairs in turn of DNA helix

Question 33

How many strands does dna or rna have

Answer 33

DNA - two strands / double RNA - has single strand