How many recombinant therapeutics have been approved for human use the world over ?

How many junctions does a transistor have?

There are 10 books in a shelf with different titles:five or these have red cover and others have green cover. In how many ways can these be arranged so that the red books are placed together ?

A bacterial cell was transformed with a recombinant DNA that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reason could be (a) Human gene may have intron which bacteria cannot process (b) Amino acid codons for humans and bacteria are different (c) Human protein is formed but degraded by bacteria (d) all of the above

Many attempts to improve livestock in the tropics have been made by 'upgrading ' through crossbreeding them with temperate breeds. The major problems faced during the failed cattle breeding are

How many different four letter words can be formed by using the four letters a,b, c, d, while the letter can be repeated ?

How many autosomes are present in a mature human sperm ?

How many varieties of rice has been estimated to be present in India ?

How many exrta embryonic membranes surround the human embryo ?

How many autosomes present in human sperm ?

How many pairs of autosomes are present in human cell ?