List of top Biology Questions

$ABO$ blood groups in human beings are controlled by the gene $I$. has three alleles - $I^A$, $I^B$ and $i$. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur ?

During mitosis, ER and nucleolus begin to disappear at

Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

If for some reason our goblet cells are non- functional, this will adversely affect

If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect ?

A nitrogen fixing blue-green alga is

The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because :

The genotype of a plant showing the dominant phenotype can be determined by

Vasa eflferentia are the ductules leading from

Bovine spongiform encephalopathy is a disease caused by prions in a.....

According to Darwin, evolution is_______

Sporopollenin, a chemical substance is found in________

The following diagrams A, B, C, D and E show the different types of arrangement of stamens based on the cohesion of their parts in different plants. Assign the stamens to their respective plants. Choose the correct answer.

The presence of corollary corona, sagittate anthers and dumb-bell shaped stigma are the characteristic features of_____________

In which of the following situations, is there a risk factor for children of incurring Erythroblastosis foetalis?

Some of the steps involved in the production of Humulin are given below. Choose the correct sequence. i) Synthesis of gene (DNA) for human insulin artificially. ii) Culturing recombinant E.coli in bioreactors. iii) Purification of humulin. iv) Insertion of human insulin gene into plasmid. v) Introduction of recombinant plasmid into E.coli. vi) Extraction of recombinant gene product from E.coli.

In C4 pathway, the CO2 fixation in mesophyll cells is carried out by the enzyme .........

Match the animals listed in Column I with their of nature of blood listed in Column II. Choose the answer which gives the correct combination of alphabets of the two columns

Infectious proteins are present in

In human female the blastocyst

The terminal velocity of a rain drop of radius $r$ is $ 2\,cm\,s^{-1}$ . If eight such identical drops combine to form a single large drop, the terminal velocity would be

Chordae tendineae are found in

One molecule of $NADH_2$ is equivalent to how many $ATP$ molecules?

Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with Components: (i) Cristae of mitochondria (ii) Inner membrane of mitochondria (iii) Cytoplasm (iv) Smooth endoplasmic reticulum (v) Rough endoplasmic reticulum (vi) Mitochondrial matrix (vii) Cell vacuole (viii) Nucleus The correct components are:

	A	B	C	D
(1)	(v)	(iv)	(viii)	(iii)
(2)	(i)	(iv)	(viii)	(vi)
(3)	(vi)	(v)	(iv)	(vii)
(4)	(v)	(i)	(iii)	(ii)