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Ask QuestionPosted by Mani Varman 8 years, 3 months ago
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Posted by Arsi Garima 8 years, 3 months ago
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Shrawan Kashyap 7 years, 11 months ago
The male cytoplasm migrates through the conjugation canal, fusing with the female. The rest of the process proceeds as in scalariform conjugation. The essential difference is that scalariform conjugation occurs between two filaments and lateral conjugation occurs between two adjacent cells on the same filament.
Chlamydomonas
Chlamydomonas is a genus of green algae consisting of unicellular flagellates, found in stagnant water and on damp soil, in freshwater, seawater, and even in snow as "snow algae". Chlamydomonas is used as a model organism for molecular biology, especially studies of flagellar motility and chloroplast dynamics, biogeneses, and genetics. One of the many striking features of Chlamydomonas is that it contains ion channels, (channelrhodopsins), that are directly activated by light. Some regulatory systems of Chlamydomonas are more complex than their homologs in Gymnosperms, with evolutionarily related regulatory proteins being larger and containing additional domains.
Posted by Fardeen Khan 8 years, 3 months ago
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Posted by Akarsh Kumar 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Platyhelminthes: Triploblastic, acoelomate, unsegmented and bilaterally symmetrical metazoans, without ****, circulatory system, but with a mouth, protonephridial system, parenchyma tissues within the space between the body wall and the gut, and spiral cleavage development.
Characteristic Features of Phylum Platyhelminthes:
1. Phylum Platyhelminthes are triploblastic, acoelomate (without a body cavity) and bilaterally symmetrical animals.
2. Body is soft, un-segmented and dorsoventrally flattened.
3. Metameric segmentation and skeletal structures, in any form, are absent. Pseudometamerism is seen in some members (e.g., Eucestoda).
4. Anterior end of the body is differentiated into a head.
Posted by Bishwajit Singh 8 years, 3 months ago
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Sneha S 8 years, 3 months ago
Posted by Reshav Singh 8 years, 3 months ago
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Posted by Muskan Pandey 8 years, 3 months ago
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Posted by Rajat Aggarwal 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Chloroplasts:The small organelles inside the cells of plants and algae are called Chloroplasts. They absorb light to make sugar in photosynthesis. The sugar is stored in the form of starch. Chloroplasts contain chlorophyll which absorbs sunlight for photosynthesis.
Posted by Aneri Patel 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Granule Cell of the Cerebellum is the smallest cell of the human body it is approximately 4um to 4.5um in size.
Posted by Swatantra Pratap 8 years, 3 months ago
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Posted by Swatantra Pratap 8 years, 3 months ago
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Posted by Swatantra Pratap 8 years, 3 months ago
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Posted by Kanishk Khurana 4 years, 6 months ago
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Sia ? 4 years, 6 months ago
| Mitosis | Meiosis |
| Interphase | |
| Each chromosome replicates. The result is two genetically identical sister chromatids (However, do note that interphase is technically not a part of mitosis because it takes place between one mitotic phase and the next) | Chromosomes not yet visible but DNA has been duplicated or replicated |
| Prophase | |
| Prophase –Each of the duplicated chromosomes appears as two identical or equal sister chromatids, The mitotic spindle begins to form. Chromosomes condense and thicken | Prophase I – crossing-over recombination – Homologous chromosomes (each consists of two sister chromatids) appear together as pairs. Tetrad is the structure that is formed. Segments of chromosomes are exchanged between non-sister chromatids at crossover points known as chiasmata (crossing-over) |
| Metaphase | |
| Metaphase -The chromosomes assemble at the equator at the metaphase plate | Metaphase I Chromosomes adjust on the metaphase plate. Chromosomes are still intact and arranged as pairs of homologues |
| Anaphase | |
| Anaphase – The spindle fibres begin to contract. This starts to pull the sister chromatids apart. At the end of anaphase, a complete set of daughter chromosomes is found each pole | Anaphase I Sister chromatids stay intact. However, homologous chromosomes drift to the opposite or reverse poles |
| Mode of Reproduction | |
| Asexual Reproduction | Sexual Reproduction |
| Occurrence | |
| All the cells | Reproductive cells |
| Function | |
| General growth and repair, Cell reproduction | Genetic diversity through sexual reproduction |
| Cytokinesis | |
| Occurs in Telophase | Occurs in Telophase I and in Telophase II |
| Discovered by | |
| Walther Flemming | Oscar Hertwig |
Posted by Swatantra Pratap 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Every organism can be classified at 7 different levels -
- kingdom
- phylum
- class
- order
- family
- genus
- species.
Each level contains organisms with similar characteristics. The kingdom is the largest group and very broad.
Posted by Shadab Anwer 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Biomolecules are molecules that occur naturally in living organisms. Biomolecules include macromolecules like proteins, carbohydrates, lipids and nucleic acids. It also includes small molecules like primary and secondary metabolites and natural products.
Posted by Komal Kumari 8 years, 3 months ago
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Posted by Anurag Pandey 8 years, 3 months ago
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Posted by Krishna Pandey 8 years, 3 months ago
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Posted by Tushita Sangwan 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
Claspers are an external appendage found on male sharks, skates, and rays that are designed to deliver sperm inside of a female. However, they are dissimilar to a ***** in that they are not an independent appendage, but rather a deeply grooved cartilaginous extension of the sharks pelvic fins.
Posted by Dileep Ramesh 8 years, 3 months ago
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Anjali Sharma 8 years, 3 months ago
As a building is made up of numbers of bricks basically
similarly the living organisms are made up of a very fundamental structure called CELL
- defined as ,, the fundamental structural and functional unit of life
- discovered by Robert Hook's in 1665
- by using simple microscope ?
- a typical cell consist of a nucleus, cytoplasm and cell membrane.
- there are two types of cells on the basis of level of development of membranes of cell organelles as
- PROKARYOTIC CELLS
- EUKARYOTIC CELLS
Posted by Rima Kashyap 8 years, 3 months ago
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Anjali Sharma 8 years, 3 months ago
The egg laying organisms are known as oviparous like frogs
and the other term is viviparous used for the organisms which give birth to young once like human beings
Posted by Gurleen Kaur 8 years, 3 months ago
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Posted by Gurleen Kaur 8 years, 3 months ago
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Tanvi Dwivedi 8 years, 3 months ago
Posted by Tanvi Dwivedi 8 years, 3 months ago
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Posted by Gurleen Kaur 8 years, 3 months ago
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Amar Kumar 8 years, 3 months ago
The International Union for Conservation of Nature (IUCN), officially International Union for Conservation of Nature and Natural Resources is an international organization working in the field of nature conservation and sustainable use of natural resources.
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