List of top Biology Questions

Biosphere is consist of:

Plasmids are single-stranded extra-chromosomal DNA. Plasmids are possessed by eukaryotic cells.

In the descending limb of loops of Henle, the urine is hypertonic, while in ascending limb of loops of Henle, the urine is hypotonic. Descending limb is impermeable to Na , while ascending limb is impermeable to HO.

Chloragogen cells of earthworm are similar to the vertebrate organ

Ora serrata is

There is an irregular mating population. If the frequency of an autosomal recessive lethal gene is 0.4, then the frequency of the carriers in a population of 200 individuals is

The disorders such as alkaptonuria and phenylketonuria are refered to as

The branch of biology dealing with the process of improvement of human race by selective breeding is called

The lining of bone marrow cavity is called

In morula stage, the cells divide without any increase in size. Zona pellucida remains undivided till cleavage is complete.

Which proteolytic enzyme induces lysis of fibrin during fibrinolysis?

Which of the following is an example of sex-linked inheritance?

The disease, in which thick cough, stops the passage of throat and form a layer of mucous membrane, is called

Which of the following plants keeps its stomata open during the night and closed during the day?

Which of the following is not a genetic vector ?

MAB stands for

In frog, 'fenestra ovalis' is

In frog, the surface of attachment of tongue is

In an animal cell, protein synthesis takes place

Genes are packaged into a bacterial chromosome by

Cold-blooded animals have no fat layer. Cold-blooded animals use their fat for metabolic process during hibernation.

The endocrine gland of insects, which secretes the juvenile hormone, is

Quill feathers at the base of quill wings are called

First restriction endonuclease enzyme was discovered in

Among the following sets of fruits, those that belong to the same category, from the point of view of classification, are