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Ask QuestionPosted by Milky Laishram 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Definition
Prokaryotic ribosomes refer to free ribosomes in prokaryotes while eukaryotic ribosomes refer to large ribosomes that facilitate translation in eukaryotes.
Found in
Prokaryotic ribosomes are found inside bacteria and archaea while eukaryotic ribosomes are found in animals, plants, fungi, and other unicellular eukaryotes with a nucleus.
Size
Prokaryotic ribosomes are small while eukaryotic ribosomes are larger. Further, the mass of a prokaryotic ribosome is 27000 kd while the mass of eukaryotic ribosomes is 42000 kd.
Sedimentation Coefficient
The sedimentation coefficient of prokaryotic ribosomes is 70S while the sedimentation coefficient of eukaryotic ribosomes is 80S.
Diameter
The diameter of a prokaryotic ribosome is ~200 Å while the diameter of a eukaryotic ribosome is ~250-300 Å
Subunits
Prokaryotic ribosomes are made up of 50S and 30S subunits while eukaryotic ribosomes are made up of 60S and 40S subunits.
Posted by Anjali Kumawat 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
On July 7, HRD Minister Ramesh Pokhriyal announced a major CBSE syllabus reduction with 30% of the syllabus slashed for the year 2020-21 for classes 9 to 12 because of the reduction in classroom teaching time due to the Covid-19 pandemic and lockdown.
CBSE has rationalized the syllabus with the help of suggestions from NCERT and the same has been notified by a new CBSE notification as well.
Deleted syllabus of CBSE Class 12 Biology
For revised syllabus click on the link:
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/SrSecondary/REVISEDBiology_2020-21.pdf" target="_blank">REVISED - Biology</a>
Posted by Kavita Chaudhary 4 years, 11 months ago
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Posted by Priyanshi Bisht 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
- Autosomal disorders – cystic fibrosis, sickle cell anaemia, myotonic dystrophy
- ***-linked – haemophilia, colour blindness
- HAEMOPHILIA – ***-linked recessive disease
- A single protein that is a part of the cascade of proteins involved in the clotting of blood is affected.
- In affected individual, a simple cut will result in non-stop bleeding.
- Heterozygous female (carrier) can transmit the disease to son.
- Possibility of female becoming a haemophilic is extremely rare.
Posted by Anshika Shrivastava 4 years, 11 months ago
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Meghna Thapar 4 years, 11 months ago
Bulbils are a small bulb-like structure which may be removed to form a new plant. Agave can sexually reproduce by seeds and vegetatively by aerial bulbils and ground level based shoots and rhizomes. Colocasia reproduces sexually by seeds and vegetatively by corms, tubers and root suckers. Zingiber reproduces vegetatively by aromatic articulated rhizomes. Vallisneria reproduces vegetatively through runners.
Posted by Anshika Shrivastava 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Micropropagation is the artificial process of producing plants vegetatively through tissue culture or cell culture techniques. In this artificial process of propagation, plants are produced invitro by asexual means of reproduction or by vegetative propagation.
Posted by Nidhi Kashyap ☺☺ 4 years, 11 months ago
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Devil ? 4 years, 11 months ago
Tanya ?? 4 years, 11 months ago
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Nidhi Kashyap ☺☺ 4 years, 11 months ago
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Tanya ?? 4 years, 11 months ago
Posted by Lokesh Rajput 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
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Posted by Anmol ? 4 years, 11 months ago
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Posted by Disha Prajapat . 4 years, 11 months ago
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Posted by Laxman Singh 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
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Infectious diseases |
Non-infectious diseases |
| Diseases that spread from one person to another are called communicable diseases. | They do not spread to others and they restrain within a person who has contracted them |
| They are caused by microorganisms called pathogens such as bacteria, protozoans, viruses, etc. | These diseases are caused by pathogens, but other factors such as age, nutritional deficiency, the gender of an individual, and lifestyle also influence the disease |
| Examples: Cholera, chickenpox, malaria |
Examples: Diabetes, cancer, asthma, etc. |
Posted by Nidhi Maurya 4 years, 11 months ago
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Meghna Thapar 4 years, 11 months ago
a. Cancer cells differ from normal cells in many ways that allow them to grow out of control and become invasive. One important difference is that cancer cells are less specialized than normal cells. That is, whereas normal cells mature into very distinct cell types with specific functions, cancer cells do not.
b. When the cells in the tumor are normal, it is benign. Something just went wrong, and they overgrew and produced a lump. When the cells are abnormal and can grow uncontrollably, they are cancerous cells, and the tumor is malignant. A malignant tumor has the ability to spread to other tissues and to initiate tumors at secondary sites, whereas a benign tumor does not spread.
c. The exact cause of a benign tumor is often unknown. It develops when cells in the body divide and grow at an excessive rate. Typically, the body is able to balance cell growth and division.
Posted by Md Sanjana Nachiyar 4 years, 11 months ago
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Posted by Pranali Mehendale 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
The group of methane-producing anaerobic bacteria is called as methanogens. Biogas is a mixture of methane and carbon dioxide. Methanogens produce methane, carbon dioxide and hydrogen gas by the anaerobic digestion of cellulosic plant part. Thus, methanogens helps in producing biogas.
Posted by Shivam Kumar 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
A n s w e r
The Two functions of the codon AUG are as follows:
(i) It acts as a start codon during protein synthesis.
(ii) It codes for the amino acid methionine.
Posted by Usha Dixit 4 years, 11 months ago
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Posted by Simran Jeet 4 years, 11 months ago
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Posted by Laxmi Yadav 4 years, 11 months ago
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Posted by Tachang Tallang 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
A typical angiosperm anther is bilobed with each lobe having two theca, thus they are called dithecous.
Microsporangium is nearly circular in outline. It is surrounded by four wall layers that is the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen. The innermost wall layer is the tapetum which nourishes the developing pollen grains. Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. When the anther is young, a group of compactly arranged homogenous cells called the sporogenous tissue occupies the centre of each microsporangium.
Posted by Yogesh Gothwal 4 years, 11 months ago
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Noor Alam 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
- In genetics, Pleiotropy is defined as the expression of multiple traits by a single gene.
- Pleiotropy is derived from a Greek word meaning more ways.
- A simple example of a Pleiotropy is phenylketonuria is a disease. It is a genetic disorder caused by the low metabolism of the amino acid phenylalanine in the body cells.
Posted by Shrihari Subbu 4 years, 11 months ago
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Posted by Akanksha Uikey 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Cyclosporin A is produced by the fungus Trichoderma polysporum. It is used as an immunosuppressive agent in organ transplant patients.
Posted by Keshav Joshi 4 years, 11 months ago
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Yangzee Sherpa 4 years, 11 months ago
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