NCERT

Question 1

length of dna

Answer 1

number of nucleotide and number of bp

Question 2

bacteriophage phi*174 length

Answer 2

5386 nucleotides

Question 3

length of bacteriophage lambda

Answer 3

48502 bp

Question 4

E.coli length

Answer 4

4.6 * 10⁶ bp

Question 5

length of haploid human dna

Answer 5

3.3 * 10⁹ bp

Question 6

name all the pentose+nitrogen bases

Answer 6

adenosine deoxyadenosine
guanosine deoxyguanosine
cytidine deoxycytidine
uridine deoxythymidine

Question 7

pentose + phosphate bond

Answer 7

phosphoester linkage

Question 8

another name of thymine

Answer 8

5-methyl uracil

Question 9

acidic substance in dna was named

Answer 9

nuclein

Question 10

ratio of purines and pyrimidines

Answer 10

purines = pyrimidines

Question 11

double helix model of dna was given by

Answer 11

crick and watson

Question 12

length of dna in a mammalian cell

Answer 12

2.2 meters

Question 13

E.coli
length of dna
no. of bp
length btw bp

Answer 13

1.36 mm
4*10⁶ bp
0.34 nm

Question 14

capsule of s strain of streptococcus pnemoniae is made of

Answer 14

smooth polysaccharide

Question 15

prior to the biochemical characterization of transforming principle, the genetic material was thought to be

Answer 15

protien

Question 16

examples for organisms with rna as genetic material

Answer 16

tobacco mosaic virus
QB bacteriophage

Question 17

the protein synthesis machinery has evolved around

Answer 17

rna

Question 18

semi conservative method was first shown in

Answer 18

E.coli

Question 19

how deoxyribonucleoside triphosphate supplies energy for polymerization

Answer 19

the two terminals of the phosphates are high energy ones, same as in atp

Question 20

replication of dna occur in a very small opening of the dna known as

Answer 20

replication fork

Question 21

all the reference point while defining a transcription unit is made with

Answer 21

coding strand

Question 22

it is the presence of the ___ that describes the template and coding strands

Answer 22

promoter

Question 23

why are the genes in eukaryotes split

Answer 23

monosistronic structural genes interrupt coding sequences

Question 24

substrate of rna polymerase in transcription

Answer 24

nucleoside triphosphate

Question 25

___ represents the dominance of rna world

Answer 25

splicing