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Molecular Basis of Inheritance

Multiple Choice Questions

281.

The Okazaki fragments in DNA chain growth

Results in transcription
Polymerise in the 3' to 5' direction and forms replication fork
Prove semi-conservative nature of DNA replication
Polymerise in the 5' to 3' direction and explain 3' to 5 DNA replication

282.

One gene-one enzyme relationship was established for the first time in

Neurospora crassa
Salmonella typhimurium
Escherichia coli
Diplococcus pneumoniae

283.

Balbiani rings are the structural features of

allosomes
polytene chromosomes
autosomes
lampbrush chromosomes

284.

Jumping genes in maize were discovered by

Hugo de Vries
Barbara McClintock
T H Morgan
Mendel

285.

DNA element with ability to change position is called

cistron
transposon
intron
recon

286.
Initiation codon is

UUU

UGA

AUG

UAG

AUG

AUG codes for Methionine (Met) that is used as a start signal in protein syntheis. Hence, it is an initiation codon.

Also, in prokaryotes, codons GUG and UUG are the start codons.

UAA (ochre), UAG (amber) and UGA (opal) are the non- sense codons as they do not code for any amino acid. Their main function is to terminate the message for gene controlling protein synthesis. Therefore, termed as chain termination or stop codons.

UUU (uracil) codes for phenylalanine.