List of top Questions asked in IISER

Which one of the following statements is correct?
A population with $N = 400$ individuals increases in numbers till it reaches an asymptote at $K = 500$ individuals, $K$ being the carrying capacity. Assuming the intrinsic rate of natural increase ($r$) to be 0.01, what would be the population growth rate ($dN/dt$)?
Polymerase chain reaction (PCR) is used to amplify a gene of interest (GOI). If, after 30 cycles of PCR, 1 billion copies of GOI are produced, approximately how many copies of GOI were present at the end of the $20^{\text{th}$ cycle?
Which of the following plasmid vectors can be used for cloning of a gene, with restriction enzymes BamHI and EcoRI, and ampicillin-containing nutrient agar for selection?
[Ori and $\text{Amp}^R$ represent origin of replication and gene for ampicillin resistance, respectively.]
Which of the following is routinely performed to detect typhoid?
Two species of a flowering plant, P ($2n = 20$ chromosomes) and Q ($2n = 30$ chromosomes) are reciprocally crossed with each other as male or female as shown below to produce F1 seeds.
Which of the following seed tissues from both the F1 seeds (R and S) will have the same chromosome numbers?
Match the enzymes in Column I with the cellular compartments in Column II.
Which of the following combinations is correct?
Which of the following graphs represents the correct relationship between light intensity (X-axis) and the rate of photosynthesis (Y-axis)?
Which of the following statements about meiosis in sexually reproducing plants is INCORRECT?
Which of the following is NOT derived from the epidermal cell layer in plants?
Which of the following proteins plays a direct role in muscle contraction?
Match the list of conditions (Column I) with the list of affected physiological processes (Column II).
Which of the following combinations is correct?
The following pedigree diagram shows the inheritance of a rare genetic disorder (filled shapes depict affected individuals).
Which of the following is the most likely pattern of inheritance of the disorder?
What will be the sequence of RNA synthesized using the following DNA template strand?
5'-GTCTAGGCTTCTC-3'