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Ask QuestionPosted by Manish Yadav 6 years, 10 months ago
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Meghna Thapar 5 years, 4 months ago
Cytokinesis is the physical process of cell division, which divides the cytoplasm of a parental cell into two daughter cells. It occurs concurrently with two types of nuclear division called mitosis and meiosis, which occur in animal cells.
During cytokinesis in plants, a cell plate is formed by the plant cells in the middle part of the cells.
Then vesicles containing cell wall matter are released that from the cell plates by fusing at the equatorial region.
The plate starts as a network of fusion tubes, which then turns into a tubule vesicular network after additional component join it during the process.
Posted by Anand S 6 years, 10 months ago
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Gaurav Seth 6 years, 10 months ago
Cuboidal epithellium : 1) cell forms like cuboidal shape
2)located in lining of kidney, ducts of salivary gland
3) function: for mechanical support, strength & secretions
columnar epithellium: 1)cell forms like pillar or column like
2) located in lining of intestine
3) function : for absorption
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Sheikh Hisba 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Rennin also called as chymosin is an enzyme (act similarly as pepsin) which is synthesized by chief cells (gastric mucosa) of stomach in some ruminant animals like calves. It is required for digestion of milk.
Renin is a enzyme produced by human kidneys that participates in the body's renin-angiotensin-aldosterone system (RAAS), a hormone system that regulates blood pressure and fluid balance. It acts on angiotensinogen (a protein) and cleaves to produce angiotensin I (a decapeptide) which regulated arterial blood pressure.
Posted by Aniket Ojha 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
In brain, the surface is highly folded to forn ridgrs and depressions. The ridges are called as 'Gyri' while depression are called as 'Sulci'
The sulci (or fissures) are the grooves and the gyri are the "bumps" that can be seen on the surface of the brain. The folding created by the sulci and gyri increases the amount of cerebral cortex that can fit in the skull.
Posted by Aman Kumar 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Cell theory is a theory which introduce the properties of cell.Cell theory says that:
- Cell is the structural and functional unit of life.
- All organisms are made up of two or more cells.
- All cells develop from pre-existing cells
The Cell theory proposed in 1838 by Matthias Schleiden and by Theodor Schwann.
Posted by Divyansh Srivastava 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
A neuron is itself in a salt solution with higher concentration of Na+ ions . Inside the neuron there is a high concentration of K+ ions and negatively charged proteins. This is why the neuron is polarised.This allows the transfer of impulse to take place.
Posted by Shubham Garg 6 years, 10 months ago
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Aniket Ojha 6 years, 10 months ago
Yogita Ingle 6 years, 10 months ago
Salivary amylase would not be able to digest starch or sugars. If saliva is not secred the starch prsent in our food will not be digested in the mouth as there would be no enzyme (salivary amylase/tyalin) to act on it
Posted by Isha Gurav 6 years, 10 months ago
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Anuj Maurya 6 years, 10 months ago
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Aniket Ojha 6 years, 10 months ago
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Gaurav Seth 6 years, 10 months ago
S.N. |
DNA |
RNA |
| 1. | DNA stands for Deoxyribonucleic Acid. The sugar portion of DNA is 2-Deoxyribose. | RNA stands for Ribonucleic Acid. The sugar portion of RNA is Ribose. |
| 2. | The helix geometry of DNA is of B-Form (A or Z also present). | The helix geometry of RNA is of A-Form. |
| 3. | DNA is a double-stranded molecule consisting of a long chain of nucleotides. | RNA usually is a single-strand helix consisting of shorter chains of nucleotides. |
| 4. | The bases present in DNA are adenine, guanine, cytosine and thymine. | The bases present in RNA are adenine, guanine, cytosine and uracil. |
| 5. | DNA is self-replicating. | RNA is synthesized from DNA on an as-needed basis. |
| 6. | Base Pairing :AT (adenine-thymine)GC (guanine-cytosine). | Base Pairing :AU (adenine-uracil)GC (guanine-cytosine). |
| 7. | Purine and Pyrimidine bases are equal in number. | There is no proportionality in between the number of Purine and Pyrimidine bases. |
| 8. | DNA is susceptible to UV damage. | Compared with DNA, RNA is relatively resistant to UV damage. |
| 9. | Hydrogen bonds are formed between complementary nitrogen bases of the opposite strands (A-T, C-G). | Base pairing through hydrogen bonds, occurs in the coiled parts. |
| 10. | DNA is found in the nucleus of a cell and in mitochondria. | Depending on the type of RNA, this molecule is found in a cell’s nucleus, its cytoplasm, and its ribosome. |
| 11. | DNA can’t leave the nucleus. | RNA leaves the nucleus (mRNA). |
| 12. | The C-H bonds in DNA make it fairly stable, plus the body destroys enzymes that would attack DNA. The small grooves in the helix also serve as protection, providing minimal space for enzymes to attach. | The O-H bond in the ribose of RNA makes the molecule more reactive, compared with DNA. RNA is not stable under alkaline conditions, plus the large grooves in the molecule make it susceptible to enzyme attack. |
| 13. | Renaturation after melting is slow. | It is quite fast. |
| 14. | DNA is only two types: intra nuclear and extra nuclear. | Three different types of RNA: m-RNA, t-RNA and r-RNA. |
| 15. | Its quantity is fixed for cell. | The quantity of RNA of a cell is variable. |
| 16. | It is long lived. | Some RNAs are very short lived while others have somewhat longer life. |
| 17. | Functions:Long-term storage of genetic information; transmission of genetic information to make other cells and new organisms. | Functions:Used to transfer the genetic code from the nucleus to the ribosomes to make proteins. RNA is used to transmit genetic information in some organisms and may have been the molecule used to store genetic blueprints in primitive organisms. |
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Sheikh Hisba 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Totipotency is the ability of a cell to divide and differentiate into a complete body. In plants, the meristematic cells divide continuously and give rise new cells of the plant body. At maturity, the meristematic cells are fully developed and functional and develop the capacity of totipotency. This implies that when they provided with all the necessary conditions of temperature, humidity and nutrients at any stage of life, they can grow and develop into new plant tissue. These totipotent cells are used in plant tissue culture to generate a new plant from an explant.
Posted by R G 6 years, 10 months ago
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Meghna Thapar 5 years, 4 months ago
On the basis of their functions, animal tissues are classified into four major types – epithelial tissues, muscular tissues, connective tissues and nervous tissue.
- Epithelial Tissue:
It is the simplest tissue and protective in nature. The cells of this tissue are tightly packed and they form a continuous sheet. They contain a very little or no intercellular space. It covers most organs and cavities within the body. The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue. Anything entering or leaving the body crosses at least one layer of epithelium. As a result, the permeability of the cells of various epithelia plays an important role in regulating the exchange of materials between the body and the external environment and also between different parts of the body. All the epithelium is usually separated from the underlying tissue by an extracellular fibrous basement membrane.
ii. Connective Tissue:
Connective tissue is the binding and supporting tissue of the animal body. Matrix forms the main bulk of this tissue. The cells are loosely spaced and less in number. The matrix may be jelly like, fluid, dense or rigid. The nature of matrix differs in concordance with the function of the particular connective tissue.
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Aniket Ojha 6 years, 10 months ago
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