List of top Biology Questions

From the given combinations of steps in PCR, identify the enzyme dependent step/s.
Identify the event in meiosis mediated by the enzyme recombinase.
The element whose percentage weight is highest in both earth's crust and human body is
Ruminant animals can digest cellulose in their food, where as human beings are unable to do so. This is because
In sewage treatment, secondary treatment is considered highly significant, because
A chilly plant was severely infected with Chilly Mosaic Virus (CMV). Identify the technique that helps to raise virus free plants in the next generation from the above virus infected plant.
The hybridisation between naturally incompatible plants like Potato and Tomato can be achieved through
Which of the following plants tissues cannot be used as explant in tissue culture?
White rust resistant variety of Brassica is
In the life cycle of plasmodium, fertilisation takes place in
The transport of which neurotransmitter is interfered by cocaine?
Certain tumours are called malignant, because
Injection of an antidote against snakebite is an example of
In a population of plants, some were extremely tall and the remaining were extremely dwarf. No plants of the population showed intermediate height. The type of operation of natural selection in the above case is
Which among the following was the biggest land dinosaur?
For the given sequence of DNA, identify the complementary sequence of bases on its mRNA from the options given below:
DNA 3'-ATGCATGCATGC-5'
When Escherichia coli cells are cultured in a medium where Lactose is absent, the 'i' gene of Lac Operon continues to produce repressor mRNA, because it is
Suppose DNA samples collected for DNA fingerprinting analysis are less than the required quantity. Which of the following techniques is helpful to make the samples sufficient for above analysis?
In eukaryotes, the entire base sequence of a gene do not appear in mature RNA because
Which of the following types of RNA carries amino acids towards ribosome during translation ?
The length of DNA helix in a typical nucleosome is
A man with blood group $A$ marries a woman having blood group $B$. The maximum possible blood groups among their progenies are
A pure breeding pea plant with round yellow seeds was crossed with pea plant having wrinkled green seeds. On selfing of $F_1$ hybrid of his cross $64$ progenies were obtained in $F_2$ generation. Find out the number of $F_2$ progenies showing non-parental characters.
In an Organism, mutation in a single gene exhibits multiple phenotypic expressions. Identify the underlying genetic mechanism in the above instance.
Which of the following characters was not studied by Mendel in his Pea plant experiments?