List of top Biology Questions

Which of the following statement(s) about plasmid is/are correct?

[I)] It can replicate by itself
[II)] Hybrid plasmid is introduced into bacteria by transformation
[III)] Other than bacteria, plasmid can also be found in bacteriophage
Depolarization of the T-tubule membrane activates the sarcoplasmic reticulum via the:
The alveoli of the lungs do not contain ``air'' because
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Consider the following statements:

[(a)] The banded appearance of the sarcomere is due to difference in the size and density of thick and thin filaments.
[(b)] The A band is the area containing thick filaments.
[(c)] A band includes the M line, the H band and the zone of overlap (thick and thin filaments).
[(d)] A band and I band are anisotropic and isotropic, respectively.
The incorrect statements are:
Out of the total sunlight energy reaching the atmosphere, the fraction utilized in photosynthesis is approximately:
The two amino acids having R groups with a negative net charge at pH 7.0 are
One of the following is the correct sequence to make a transgenic animal.
The major electron transport chain complexes of mitochondria that are involved in the generation of Reactive Oxygen Species (ROS) are
Which is not an example of transmembrane transport between different subcellular compartments?
In which organ of the digestive tract does hydrolysis of starch into maltose take place?
Name the state where never dividing cells of neurons and skeletal muscle are present?
Electrons from the excited chlorophyll molecules of PS-II are first accepted by
Which of these bioactive compounds is used as an immunosuppressive agent in organ-transplant patients?
During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?
Acromegaly is the result of
During the propagation of a nerve impulse, the action potential results from the movement of
Explain any three examples of biopiracy.
What is ecological succession? Name various seral stages from pioneer species to climax community with suitable example in hydrarch succession.
How many pairs of autosomal chromosomes are there in normal humans?
In a denaturing polyacrylamide gel electrophoresis experiment, pure intact adult human hemoglobin will yield (number) bands.
In a randomly mating population, the frequency of 'A' allele is 0.7. What is the frequency of An" genotype in the next generation according to Hardy- Weinberg's law? (up to two decimal places)
In an actively growing population from a single bacterium, 1,048,576 cells are present after 20th generation. How many cells were there in 5th generation?
How many GTP molecules are required for the translocation of tRNA from P site to E site during translation elongation process in bacteria?
Which of the following is involved in innate immune response in higher mammals?