Biology is the primary subject in NEET, which is why your preparations must be perfect for its various topics. Following the important notes of biology for NEET molecular basis of inheritance is crucial when it comes to understanding the basics of DNA and RNA. Basically, this topic highlights how certain characteristics are passed from generation to generation among human beings.
However, before proceeding to the molecular basis of inheritance NEET notes, let us learn a bit more about nucleotide, RNA and DNA, including the basic difference between the latter two.
Biology is the primary subject in NEET, so your preparations for its various topics must be flawless. When it comes to understanding the fundamentals of DNA and RNA, it is critical to follow the important notes of biology for NEET molecular basis of inheritance. Essentially, this topic focuses on how certain characteristics are passed down from generation to generation among humans.
However, before we move on to the molecular basis of inheritance NEET notes, let us first learn a little more about nucleotides, RNA, and DNA, as well as the fundamental difference between the latter two.
What are RNA and DNA?
RNA (Ribonucleic Acid) and DNA (Deoxyribonucleic Acid) are the two primary building blocks. Both of these act as a store for genetic materials, although DNA is more common. Listed below are some of the differences between DNA and RNA, which can promote better understanding of them.
The two primary building blocks are RNA (ribonucleic acid) and DNA (deoxyribonucleic acid). Both of these serve as a repository for genetic materials, with DNA being the most common. Some of the differences between DNA and RNA are listed below to help you understand them better.
DNA’s Double Helix Structure
The Important notes of biology for NEET molecular basis of inheritance are incomplete without a reference to the characteristics of the double-helix model for DNA. Here is what you need to know about it.
Crick and Watson were the two scientists who proposed this revolutionary double helix model for DNA in 1953.
Later, scientist Ervin Chagraff postulated that the ratio of Cytosine and Guanine to Thymine and Adenine is always constant, and is equal to one.
DNA contains two polypeptide chains, with opposing polarity.
The nitrogen base of each chain combines with hydrogen to form the base pair or bp.
Pyrimidine base of one nucleotide chain always maintains a connection with the purine base chain of another nucleotide.
Similarly, Thymine always links with Adenine only.
Molecular basis of inheritance class 12 notes rightly explains that DNA replication is a process by which genetic materials from nucleic acid compounds are transferred into proteins. The amount of genetic data through such replication remains constant between the parent and progeny cells after mitosis.
The class 12 notes on the molecular basis of inheritance correctly explain that DNA replication is a process by which genetic materials are replicated.
Some of its Features Include
Replication origin is the source from which this process begins.
Deoxyribonucleoside triphosphate performs two vital functions here, namely, it acts as a substrate and it provides energy for the polymerisation to occur.
The DNA structure undergoes a mild change, leading to the formation of a replication fork. This acts as a site for replication.
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The above diagram shows the process of replication occurring in DNA. Studying the same should help you understand this procedure easily.
Transcription is the process during which information from the DNA is transferred to the RNA. However, only a single segment from the former is transferred. Here are some salient features of transcription –
DNA transcription involves three regions, namely, a terminator, a structural gene and a promoter.
Keep in mind that in RNA, Adenine cannot pair with Thymine, but instead links with Uracil.
Transcription process in bacteria is quite distinct from transcription in other living organisms. For bacteria, mRNA cytosol and nucleus are fused together, which means that there is no need for further processing.
Differences Between RNA Transcription and DNA Replication
The distinction between DNA replication and RNA transcription is one of the important biology notes for the NEET molecular basis of inheritance. The table below contains all of the pertinent information in this regard.
Aside from replication and transcription, cells also translate. Translation is the method by which amino acid polymerisation takes place. All three RNAs, tRNA, mRNA, and rRNA, play critical roles in the translation process.