NEET UG Botany MCQ-107

Question No:1

Three major types of RNA are physically brought together during

(A) Replication of DNA
(B) Autocatalysis of DNA
(C) Translation
(D) Transcription

Question No:2

What is the ratio of non sense codons to sense codons respectively ?

(A) 3:1
(B) 1:3
(C) 1:20
(D) 20:1

Question No:3

According to recent concept the number of types of t – RNA is equal to

(A) No. of sense codons
(B) No. of non sense codons
(C) Total no. of triplet codons
(D) No. of termination codons

Question No:4

If the DNA of a zygote has 20% Adenine, Thymine in the gametic DNA is

(A) 40%
(B) 20%
(C) 30%
(D) 15%

Question No:5

Length of DNA with 200 nucleotides is

(A) 680A 0
(B) 68A 0
(C) 34A 0
(D) 340A0

Question No:6

Number of phosphodiester bonds in one coil length of DNA

(A) 14
(B) 16
(C) 18
(D) 20

Question No:7

The t RNA molecules with the following anti codons do not exist in cells


Question No:8

A fragment of DNA has 480 nucleotides out of which 110 are those of adenine. The number of cytosine nucleotides is

(A) 110
(B) 130
(C) 220
(D) 240

Question No:9

How many H-bonds are formed between the two strands of dsDNA of 170A 0 length if the cytosine is 20%

(A) 130
(B) 110
(C) 120
(D) 180

Question No:10

If the DNA fragment of length 102A 0 has 8 adenines, what is the number of G=C pairs in that DNA fragment ?

(A) 8
(B) 16
(C) 44
(D) 22

Question No:11

How many hydrogen bonds are present between complementary nitrogen bases of a DNA with 5 turns and 20 Adenines?

(A) 130
(B) 90
(C) 100
(D) 80

Question No:12

The length of DNA in one chromosome is 510 A 0. It has 20% of 6 -aminopurines. The total number of nucleotides and hydrogen bonds in that chromosome respectively, are

(A) 300 & 390
(B) 150 & 390
(C) 150 & 190
(D) 120 & 156

Question No:13

How many coded nitrogen bases are present in m-RNA from which a polypeptide chain with 60 amino acids is fromed in bacteria cells, (including nonsense codon) ?

(A) 200
(B) 60
(C) 180
(D) 183

Question No:14

How many nucleotides are present in 170 A 0 length of DNA ?

(A) 100
(B) 120
(C) 150
(D) 200

Question No:15

A scientist isolated a piece of DNA whose length is 136 A0 by using chemical knives. He removed one complete turn from it. What will be the number of nucleotides present in it?

(A) 200
(B) 100
(C) 80
(D) 60

Question No:16

A DNA segment in which both strands are labelled with 15N is transferred to 14N medium & allowed it to replicate 3 times. How many daughter molecules show both the strands with 14N?

(A) 6
(B) 4
(C) 2
(D) 1

Question No:17

An organism exclusively with 70S type of ribosomes contains one of the following

(A) DNA enclosed with in a nuclear membrane
(B) Circular naked DNA
(C) Double stranded DNA with protein coat
(D) Single stranded DNA with protein coat

Question No:18

The arrangement of atoms and molecular groups in DNA and RNA can be studied using

(A) Centrifugation
(B) Spectrophotometer
(C) X- ray diffraction
(D) Histochemistry

Question No:19

Arrange the following in ascending order based upon their molecular weights
A) Nucleotide
B) Phosphate
C) Nucleoside
D) Sugar

(A) A – B – C -D
(B) A – C – D – B
(C) A – C – B -D
(D) B – D – C – A

Question No:20

In DNA the oxygen atom is lost from the pentose sugar molecule at this carbon

(A) 5
(B) 4
(C) 2
(D) 1