Find the correctly matched enzyme with the rRNAs they transcribe
I. RNA polymerase — I 28S, 18S and 5.85 rRNAs
II. RNA polymerase — III 28 S, 18S and 5.85 rRNAs
III. RNA polymerase — II tRNA, 5srRNA and Sn(1c)RNAs
IV. RNA polymerase — II hnRNA
I and II only
III and III only
II only
III and IV only
III and IV only
If the total amount of adenine and thymine in a double stranded DNA is 55%, the amount of guanine in this DNA will be
45%
27.5%
25%
22.5%
22.5%
When mendel self-hybridised the F1 plants of genotype RrYy, in the F2 generation they yellow and green colour segregated in the ratio
1 : 2 : 1
3 : 1
9 : 3 : 3 : 1
1 : 1
1 : 1
Structure of a polynucleotide chain of DNA is given below. Identify the locations (numbered 1 to 5) that show errors in the structure
1 and 3
1 and 4
3 and 5
2 and 4
2 and 4
Which of the following disorder is caused by autosomal aneuploidy?
Down's syndrome
Haemophilia
Sickle cell anemia
Phenylketonuria
Phenylketonuria
Identify the scientists from the hints given below
Morgan and Correns
De Vries and Boveri
Brides and Correns
Bridges and Sutton
Bridges and Sutton
The 'terminator/stop codons UGA, UAG and UAA
Initiate translation
Do not code for any; amino acids
Code for only one amino acid
Code for more than one amino acid
Code for more than one amino acid
B.
Do not code for any; amino acids
Termination codon UGA, UAG and UAA does not code for any amino acid.
The variable number of tandem repeats' used as a probe in DNA fingerprinting is
Expressed sequence tag
Satellite DNA
Bacterial artificial chromosome
Restriction enzyme
Restriction enzyme
Assertion (a) In Eukaryotes, replication and transcription occur in the nucleus but translation occurs in the cytoplasm
Reasoning (R): mRNA is transferred from the nucleus to the cytoplasm where ribosomes and amino acids are available for protein synthesis
A is true but R is false
A is false but R is true
Both A and R are false
Both A and R are true but R is not the correct explanation for A
Both A and R are true but R is not the correct explanation for A
Consider the statements regarding lac operon and choose the correct option
(i) lactose is the substrate for the enzyme beta-galactosidase and regulates switching on and off of the operon
(ii) lac operon consists of three regulatory genes
(iii) lac operon consists of one structural gene
(iv) regulation of lac operon by repressor is referred to as positive regulation.
(i) and (ii) only are correct
(iii) and (iv) only are correct
(i) only is correct
(iv) only is correct
(iv) only is correct