(1). Action of topoisomerase leads to changes in a. Linking number of single-stranded linear DNA b. Lining number of double stranded linear DNA c. Linking number of closed circular single stranded DNA d. Linking number of closed circular double stranded DNA (2). Sarcomas are cancers originating from: a. Spleen b. Lymph node c. Skin d. Connective tissue (3). Receptor mediated […]
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Similarities and Difference between RNA and DNA- A Comparison Table
We wish to suggest a structure for the salt of deoxyribose nucleic acid (DNA). This structure has novel features which are of considerable biological interest. Watson & Crick, 1953 DNA and RNA are the two types of nucleic acids (a class of macromolecules in the cells) present in all prokaryotic and eukaryotic organisms. Both are essentially the polymers of nucleotides […]
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Difference between Necrosis and Apoptosis: A Comparison Table
Apoptosis vs Necrosis Apoptosis and Necrosis Apoptosis and Necrosis are two types of cell death occur in organisms. The cells undergo death when the cell death becomes necessary as a part of developmental process or they fail to adapt to injuries. Both these types of cell deaths differ in their initial cause and progression of the cell death pathway. Apoptosis […]
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Nucleosome Model of Chromosomes in Eukaryotes (Short Notes)
Does the DNA really need to FOLD inside the nucleus? A diploid human cell contains approximately 6.4 billion base pairs. These 6.4 billion base pairs are distributed in our 23 pairs (2n = 46) of chromosomes. We know that each chromosome contain a single linear segment of DNA. According to Watson and Crick model, the distance between each base pair in […]
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Classification of Chromosomes based on Position of Centromere and Length of Chromosomal Arms
The size and shape of the chromosomes are variable in the different phases of cell cycle. Chromosomes in the interphase of cell appear as thin, coiled, elastic and thread-like structures. This thread-like stainable interphase chromosome is called chromatin. During the mitotic or meiotic cell division, the chromatin materials become thicker in their width and shorter in their length. Chromosomes in […]
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