111.

A person affected with phenylketonuria, lacks an enzyme that converts the amino acid phenylalanine into

• Valine

• Proline

• Histidine

• Tyrosine

• Tyrosine

Identify the wrong statement about DNA

• The length of DNA is defined as the number of base pairs present in it

• Cytosine is common to both DNA and RNA

• In a nucleotide, the nitrogenous base is linked to a phosphate group

• Thymine is chemically 5-methyl uracil

• Thymine is chemically 5-methyl uracil

Choose the wrong statement

• In grasshopper, besides autosomes males have only one X-chromosome, whereas females have a pair of X-chromosomes.

• In XY type of sex determination, both males and females have same number of chromosomes.

• In Drosophila, males have one X and one Y chromosome, whereas females have a pair of Xchromosome besides autosomes

• In birds, females have one Z and one W chromosomes, whereas males have a pair of Z chromosomes besides autosomes

• In birds, females have one Z and one W chromosomes, whereas males have a pair of Z chromosomes besides autosomes

Which property among these listed below is not a criteria for a molecule to act as a genetic material?

• Generate its replica

• Chemically and structurally stable

• Mutate slowly to facilitate evolution

• Express itself in the form of Mendelian characters

• Express itself in the form of Mendelian characters

Match Column I with Column II and choose the correct option.

• I - B; II - E; III - A; IV - C

• I - C; II - D; III - B; IV - A

• I - B; II - D; III - C; IV - A

• I - A; II - E; III - D; IV - B

• I - A; II - E; III - D; IV - B

In sickle cell anemia, the sequence of amino acids from the first to the seventh position of the b-chain of haemoglobin S(HbS) is

• His, Leu, Thr, Pro, Glu, Val, Val

• Val, His, Leu, Thr, Pro, Glu, Glu

• Thr, His, Pro, Val, Pro, Val, Glu

• Glu, His, Leu, Pro, Val, Glu, Glu

• Glu, His, Leu, Pro, Val, Glu, Glu

Which triplet codon does not have a tRNA associated with
it?

• UAA

• UUA

• UUU

• AUU

• AUU

Read the following statements and choose the correct option:

I. RNA polymerase associates transiently with 'Rho' factor to initiate transcription.

II. In bacteria, transcription and translation takes place in the same compartment.

III. RNA polymerase I is responsible for transcription of tRNA.

IV. When hnRNA undergoes capping process, adenlyte residues are added at 3' end in a template independent manner.

V. hRNA is the precursor of mRNA.

• II only is correct

• II, III and V only are correct

• III and IV only are correct

• I and IV only are correct

• I and IV only are correct

Choose the correct statement.

• Haploid content of human DNA is 4.6 × 10⁶ bp.

• A nitrogenous base is linked to pentose sugar through phosphodiester linkage

• X-ray diffraction data of Maurice Wilkins and Rosalind Franklin was the basis of Watson and Crick's DNA model

• DNA is an acidic substance was first identified by Watson and Crick

• DNA is an acidic substance was first identified by Watson and Crick

Aminoacylation of tRNA is essential for

• replication of RNA

• formation of peptide bond

• splicing

• initiation of transcription

• initiation of transcription