The site on the ribosome where the peptide bond is formed is the?
While the growing peptide chain is held at the P site, the new amino acid enters at the A (Aminoacyl) site. The peptide bond forms between the chain on the P site and the amino acid on the A site, effectively transferring the chain to the A site.
Question 62 of 668
📘 CLASS XII
Untranslated regions (UTRs) are found on?
UTRs are sequences on messenger RNA (mRNA) located before the start codon (5-prime UTR) and after the stop codon (3-prime UTR). They are not translated into protein but are crucial for efficient translation and stability.
Question 63 of 668
📘 CLASS XII
Lactose acts as an inducer in the Lac operon by binding to?
Lactose (specifically allolactose) acts as an inducer by binding to the repressor protein. This binding causes a conformational change in the repressor, preventing it from binding to the operator and allowing transcription to proceed.
Question 64 of 668
📘 CLASS XII
Which gene in the Lac operon codes for Permease?
The lacY gene encodes the enzyme Permease. This enzyme acts on the cell membrane to increase its permeability to beta-galactosides (like lactose), allowing entry into the cell.
Question 65 of 668
📘 CLASS XII
Regulation of the Lac operon by the repressor is referred to as?
The regulation is called negative because the binding of the regulatory protein (repressor) prevents transcription. Positive regulation also occurs (via CAP-cAMP), but the repressor mechanism specifically is negative control.
Question 66 of 668
📘 CLASS XII
A method of sequencing genomes that involves sequencing coding and non-coding regions and then assigning functions is?
Sequence Annotation involves sequencing the whole genome (both coding and non-coding regions) and then using analytical tools to assign functions to the different regions. ESTs, in contrast, focus only on expressed (coding) genes.
Question 67 of 668
📘 CLASS XII
BACs and YACs are used in HGP as?
BAC (Bacterial Artificial Chromosome) and YAC (Yeast Artificial Chromosome) are cloning vectors used to handle large DNA fragments. They were essential in the Human Genome Project for cloning and amplifying DNA segments for sequencing.
Question 68 of 668
📘 CLASS XII
Single Nucleotide Polymorphisms (SNPs) were identified at approximately how many locations in the human genome?
The Human Genome Project found that single nucleotide differences (SNPs) occur at about 1.4 million locations in the human genome. These are important for understanding disease susceptibility and evolutionary history.
Question 69 of 668
📘 CLASS XII
The blotting technique used in DNA fingerprinting is?
DNA fingerprinting uses Southern Blotting. In this technique, DNA fragments separated by electrophoresis are transferred to a membrane (nitrocellulose or nylon) and hybridized with radioactive probes.
Question 70 of 668
📘 CLASS XII
Which chromosome has the fewest number of genes?
Chromosome Y contains the fewest genes (231), while Chromosome 1 contains the most (2968), according to the findings of the Human Genome Project.
