Biochemistry · MU Sofia

5. Nucleic Acids – Types and Biological Role.

Covers the biological roles of DNA and RNA, their nucleotide composition and base pairing, and the purine and pyrimidine distinction. It also touches on free nucleotides such as ATP and GTP, non-coding RNAs, and the use of purine and pyrimidine analogs as anticancer and antimicrobial agents. A short set of multiple-choice questions with answers closes the note.

Inside: 15 sections · 4 labelled pictures · 15 flashcards · 7 min

Topic 5 of 70 in the MU Sofia syllabus for Biochemistry (Medicine, Year 2). The free AceMed note covers it in 14 sections, about 923 words (7 min of reading), with 15 flashcards.

In this note

  1. DNA & RNA - Biological Roles
  2. DNA and RNA: Fundamental Molecules of Life
  3. Chemical Composition
  4. Chemical Bonds Within Nucleotides and Between Them
  5. Non-Coding RNA (ncRNA)
  6. Hydrogen Bonding and Base Pairing
  7. PURINES VS PYRIMIDINES:
  8. Free Nucleotides and Their Biological Action
  9. Free Nucleotides with Important Biological Action
  10. Characteristics of Polynucleotide Chains
  11. Purine and Pyrimidine Analogs: Anticancer and Antimicrobial Agents
  12. Antimicrobial Agents
  13. MCQ ☺
  14. ANSWERS:

DNA & RNA - Biological Roles

  • Genetic Information Storage: DNA holds the instructions necessary for an organism's development and functioning.
  • Genetic Information Translation: RNA translates genetic information from DNA into proteins, the workhorses of the cell.
  • Regulation and Signaling: Certain forms of RNA act as regulators of gene expression, while nucleotides like ATP and GTP play critical roles in cell signaling and energy transfer.

DNA and RNA: Fundamental Molecules of Life

  • DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) are the two types of nucleic acids, essential for the coding, decoding, regulation, and expression of genes.
  • DNA is the carrier of genetic information in most living organisms, playing a crucial role in storing long-term information.
  • RNA is primarily involved in the synthesis of proteins, acting as the messenger between DNA and ribosomes to produce proteins, and has roles in gene regulation and the expression of genes.

Chemical Composition

  1. 1. DNA (Deoxyribonucleic Acid):
  2. 1. DNA consists of nucleotides composed of three main components: a phosphate group, a deoxyribose sugar molecule, and a nitrogenous base.
  3. 2. Nitrogenous bases include adenine (A), guanine (G), cytosine (C), and thymine (T).
  4. 3. The sugar-phosphate backbone provides structural stability to the DNA molecule.
  5. 2. RNA (Ribonucleic Acid):
  6. 1. RNA also comprises nucleotides with three components: a phosphate group, a ribose sugar molecule, and a nitrogenous base.
  7. 2. Nitrogenous bases in RNA include adenine (A), guanine (G), cytosine (C), and uracil (U).

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