Biology questions
20584 published questions with worked solutions.
- Collagen is : -
- Which of the following enzymes are used to join bits of DNA : -
- Manipulation of DNA in genetic engineering became possible due to the discovery of : -
- There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What...
- Introduction of food plants developed by genetic engineering is not desirable because -
- Nucleus of a donor embryonal cell/somatic cell is transferred to an enucleated egg cell. Then after the formation of organism,...
- Viruses are no more "alive" than isolated chromosomes because :-
- Given below are four matchings of an animal and its kind of respiratory organ : A. Silver fish – trachea B. Scorpion – book lung...
- Convergent evolution is illustrated by : -
- Which one of the following sequences was proposed by Darwin and Wallace for organic evolution : -
- Random genetic drift in a population probably results from : -
- If Henle's loop were absent from mammalian nephron, which of the following is to be expected : -
- Which group of vertebrates comprises the highest number of endangered species : -
- Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at...
- Which one of the following bacteria has found extensive use in genetic engineering work in plants : -
- Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother...
- Maximum application of animal cell culture technology today is in the production of : -
- Escherichia coli is used as an indicator organism to determine pollution of water with ;-
- Which one of the following pairs correctly matches a hormone with a disease resulting from its deficiency : -
- Short-lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is categorised as :-