Practice free Molecular Basis of Inheritance (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Polysome is formed by (AIPMT - 2008)
A polysome, or polyribosome, is a complex formed by multiple ribosomes simultaneously translating a single mRNA strand. This arrangement allows for the production of multiple copies of a protein from a single mRNA molecule, thereby increasing the efficiency of protein synthesis.
Semiconservative replication of DNA was first demonstrated in (AIPMT - 2009)
The semiconservative replication of DNA, which means that each of the two new DNA molecules contains one original and one new strand, was first demonstrated in Escherichia coli by Matthew Meselson and Franklin Stahl in 1958. This experiment provided strong evidence for the semiconservative model of DNA replication.
Ribosomal RNA is actively synthesized by
Ribosomal RNA (rRNA) is actively synthesized in the nucleolus. The nucleolus is a region within the nucleus where rRNA is transcribed and assembled into ribosomal subunits. This makes the nucleolus the main site for rRNA synthesis.
Intiation codon of protein synthesis (in eukaryotes) is (AIIMS - 1986)
AUG has dual purpose-
1.it codes for methionine
2. it is the start codon
Semiconservative DNA replication using d15d N was demonstrated by (AIIMS -1994)
The semiconservative model of DNA replication using extsuperscript{15}N (heavy nitrogen) was demonstrated by Matthew Meselson and Franklin Stahl. In their famous experiment, they used density gradient centrifugation to show that DNA replication involves each of the two parent strands serving as a template for a new strand, resulting in two daughter DNA molecules, each with one old and one new strand.
In operan concept, the operator gene combines with (AIIMS -1986)
In the operon model, the operator gene binds with the repressor protein (produced by the regulator gene) to switch off the transcription of structural genes. When the repressor is bound to the operator, RNA polymerase is blocked from transcribing the genes within the operon. This is a key regulatory mechanism in prokaryotic gene expression.
Termination of polypeptide chain is brought about by
Termination of chain growth in protein synthesis is brought about by UAA, UAG, UGA. Translation starts with a chain initiation codon or start codon and terminates with a stop codon.
The three stop codons have been given names : UAG is amber, UGA is opal, and UAA is ochre. Stop codons are also called "termination" or "nonsense" codons.
RNA that picks up specific amino acid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is
Transfer RNAs (tRNAs) decipher the mRNA information and transfer the appropriate amino acid to a growing polypeptide chain during protein synthesis.
Correct sequence of code transfer during polypeptide formation is (AIIMS -1999)
The correct sequence of code transfer during polypeptide formation is: DNA -> mRNA -> tRNA -> amino acids. This is the central dogma of molecular biology. The genetic information is transcribed from DNA to mRNA, which then travels to the ribosome. At the ribosome, tRNA brings the appropriate amino acids in sequence to form a polypeptide chain.
Best method to determine paternity is
The best method to determine paternity is DNA fingerprinting. DNA fingerprinting analyzes the unique patterns in an individual's DNA, making it highly reliable for identifying biological relationships, including paternity.
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