The discovery of DNA | History

How was DNA first discovered and who discovered it? Read on to find out… 

It is a common misconception that James Watson and Francis Crick discovered DNA in the 1950s. In reality, DNA was discovered decades before. It was by following the work of the pioneers before them that James and Francis were able to come to their ground-breaking conclusion about the structure of DNA in 1953.

The story of the discovery of DNA begins in the 1800s… Continue reading

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NCERT Exercise Solutions | Class XI & XII

The following pages contain chapter-wise solutions to all the NCERT Exercise questions in Biology.

NCERT Exercise Solutions | Biology |Class-XI

NCERT Exercise Solutions | Biology | Class-XII 

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What is DNA Replication?

DNA replication is the process by which DNA makes a copy of itself during cell division.

  1. The first step in DNA replication is to ‘unzip’ the double-helix structure of the DNA
  2. This is carried out by an enzyme called helicase which breaks the hydrogen bonds holding the complementary bases of DNA together (A with T, C with G).
  3. The separation of the two single strands of DNA creates a ‘Y’ shape called a replication ‘fork’. The two separated strands will act as templates for making the new strands of DNA.
  4. One of the strands is oriented in the 3’ to 5’ direction (towards the replication fork), this is the leading strand. The other strand is oriented in the 5’ to 3’ direction (away from the replication fork), this is the lagging strand. As a result of their different orientations, the two strands are replicated differently:

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Do we really use only 10% of our brain?

Most of us believe in the fact that we use only 10% of our brain. In an average, an adult spends 20% of the total glucose burnt to sustain the brain’s energy requirement, while in children the value goes up to 50% and in infants, it is 60%. As a matter of fact the brain requires a lot of energy to function properly, why has the 90% of the supposedly used fragment of the brain didn’t vanish in due course of evolution? Why is it present till now? Watch the video below to get an answer to the question.

 

What is DNA?

DNA or deoxyribonucleic acid is a long molecule that contains our unique genetic code. Like a recipe book, it holds the instructions for making all the proteins in our bodies.  

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What is a genome?

A genome is an organism’s complete set of genetic instructions. Each genome contains all of the information needed to build that organism and allow it to grow and develop. 

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Branches of Biology and their Fathers​

Here is list of various fields of biology and scientists who are regarded as father or founder of each of the field.

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