Question

QUESTION 11 Meselson and Stahl had obtained the resuk below, what would have been there conclusion First Generation Replication Replication N4 14 NINIS NAS N15 DNA replication is conservative DNA replication is semi-conservative DNA replication is dispersive None of the above QUESTION 12 If one strand of DNA Is CGGTAC in the 5-3 direction, what is the corresponding complementary strand of DNA in the 53' direction? GCCTAG ©GTACG TAACGT GCCATG CATGGA QUESTION 13 Which of the following statements regarding the flow of genetic information is false? Ribosomes function as factories that coordinate the functioning of mRNA and RNA Transcription occurs in the cytoplasm of eukaryotic cells. Polypeptides form proteins that determine the appearance and function of the cell and organism. Eukaryotic mRNA is transported from the nucleus to the cytoplasm The sequence of nucleotides in an mRNA determines the sequence of amino acids in a protein QUESTION 14 In the genetic code. some codons specify more than one amino acid. some codons consist of two nucleotides some amino acids are not specified by any codons. many amino acids are specified by more than one codon codons are ambiguous.

Answer 1

Q 11 ans-DNA replication is semi conservative.

because in first generation both strand contains N15 so it has more density so it will sedemented at above bottom.in second generation cells are grown in N14 so in replication process each DNA molecule has one N15 and another is N14.so it will sedements level above first generation because it is lighter than firat generation DNA. In third generation again DNA is grown in N14 medium it will replicated and sedimented at just above second generation.hence this results explains that this is semiconservative replication.

Q 12 ans- 5'-GTACCG-3'

because DNA strands are antiparallel that is one runs in 5' to 3' and another complimentary strand runs in 3' to 5' direction.

A pairs with T , G pairs with C and vice versa.

Q 13 ans-False statememnt is- Transcription occurs in cytoplasm of eukaryotic cell.

this statement should like this-Transcription occurs in Nucleus of the eukaryotic cell.because DNA is present in nucleus and tranacription occure on DNA of chromosomes.

all other statements are true regarding flow of genetic information.

Q 14 ans- True statement is-many amino acids are specified by the more than one codon.

other statements are wrong because it should be like

One codon specifies only one amono acids.

all codons made up of three nucleotides.

All amino acids are specified by minimum one codon.

Codons are non ambiguous.