All of the following are found in a prokaryotic cell, except:

Observe the figure and answer the questions:

What is the function of 'A'?

Observe the figure and answer the questions:

Identify the parts A and B.

DNA ${\mathrm{C}}_{\mathrm{o}}\mathrm{t}$ analysis is based upon the principles of DNA renaturation kinetics. The rate at which heat-denatured DNA sequences in solution will renature is dependent on DNA concentration, re-association temperature, cation concentration, and viscosity (usually not a factor if the DNA is free of contaminants). Upon heat-denaturation of an entire genomic DNA, the rate at which a particular sequence will re-associate in a given buffer solution is proportional to the number of times the sequence is found in the genome. Given enough time, nearly all of the DNA in a heat-denatured sample will re-associate. Highly repetitive, moderately repetitive and non-repetitive are the three types of DNA sequences found normally in all genomes giving them different levels of complexity. Typical ${\mathrm{C}}_{\mathrm{o}}\mathrm{t}$ curves (see graph) were obtained for genomic DNA from three organisms $(\mathrm{P},\mathrm{Q}$ and $\mathrm{R})$.

Based on this information, select the correct option(s) from the following:

Identify P and Q in the following figure?

Khorana performed experiments to decipher the codons that code for a particular amino acid. The results of these experiments using synthetic mRNAs and the corresponding polypeptide repeats that were generated are given in the table below.

Based on the results, the correct combination(s) of codons and amino acids is/are

In biological systems, proteins (repressors and activators) control gene expression. Repressors bind to promoters and inhibit gene expression. Some promoters require activators for gene expression. These constitute a genetic circuit and are analogous to logic gates in digital electronics. A schematic diagram of a genetic circuit in a cell is shown below. Binding of IPTG to LacI activates transcription from $P_{\mathrm{lac}}$. Binding of arabinose (Ara) to AraC activates transcription from $P_{\mathrm{ara}}$.

 The correct statement(s) regarding the given genetic circuit is/are

Proteins $\mathrm{P}1$ and $\mathrm{P}2$  bind to each other to form a complex. This complex has a high binding affinity to a specific element on the promoter sequence of a gene $\mathrm{X}$, thus transcribing it. The product of gene $\mathrm{X}$is responsible for the accumulation of red pigment in some plants. Under drought stress, another protein $\mathrm{P}3$ binds to $\mathrm{P}2$ and prevents its binding to $\mathrm{P}1$ and the plants appear pale. The following table depicts a representation of phenotypes of wild-type and mutant  plants.

Choose the correct statement(s).