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Ask QuestionPosted by Tarini Sahu 4 years, 2 months ago
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Anushka Singh 4 years, 2 months ago
Md Sainul Islam 4 years, 2 months ago
Posted by Tarini Sahu 4 years, 2 months ago
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Anushka Singh 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Antibiotics are useless against viral infections. This is because viruses are so simple that they use their host cells to perform their activities for them. So antiviral drugs work differently to antibiotics, by interfering with the viral enzymes instead.
Posted by Ankita Chawla 4 years, 2 months ago
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Prabhat Patel 4 years, 2 months ago
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Posted by Sneha Kumari 4 years, 2 months ago
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Meghna Thapar 4 years, 2 months ago
Cholera, bubonic plague, smallpox, and influenza are some of the most brutal killers in human history. And outbreaks of these diseases across international borders, are properly defined as pandemic, especially smallpox, which throughout history, has killed between 300-500 million people in its 12,000 year existence. Researchers have solved a fundamental mystery about smallpox that has puzzled scientists long after the natural disease was eradicated by vaccination: they know how it kills us. Scientists can now describe how the virus cripples immune systems by attacking molecules made by our bodies to block viral replication.
Posted by Manjeet Kaur 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
The smallest cell is the sperm cell and the largest cell is ovum in the human body.
Posted by Ramesh Bhasker 4 years, 2 months ago
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Prabhat Patel 4 years, 2 months ago
Gaurav Seth 4 years, 2 months ago
Elements :
- Elements are pure substances which are the basic unit of matter and cannot be broken down into two or more simpler substances by any means.
(1) Elements are the simplest form of a pure substance i.e made up of the same atoms, whereas mixture is a mix of different elements.
(2) Elements can not be broken into anything else by any physical or chemical means, whereas mixtures are not chemically combined and can be separated by chemical means.
(3) The atom or atoms of an element (they also have fixed atomic mass) are in fixed ratio, whereas substances in a mixture can be added in any ratio.
(4)An element has its fixed properties, whereas the different substances in a mixture show their different properties.
(5)Examples of element are hydrogen, oxygen, etc and examples of mixture are mixture of sand and salt, mixture of iron fillings and sulfur, etc.
Posted by Ravindra Singh 4 years, 2 months ago
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Posted by Lucky Sharma 4 years, 2 months ago
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Gaurav Seth 4 years, 2 months ago
A semi-permeable membrane is also called a selectively permeable memebrane or partially permeable membrane. Semi-permeable membranes allow only certain molecules or ions to pass through it through the process of diffussion.
An example of biological semi-permeable is the lipid bilayer of plasma membrane in cells.
Posted by Vishal Ray 4 years, 2 months ago
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Hareah Jadav 4 years, 2 months ago
Md Sainul Islam 4 years, 2 months ago
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Posted by Nur Narjina Ahmed 4 years, 2 months ago
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Sunny Kumar Chaudhary Chaudhary 4 years, 2 months ago
Sunitha Anil 4 years, 2 months ago
Gaurav Seth 4 years, 2 months ago
Compounds
Compound is a pure substance made up of two or more elements combined chemically in a definite ratio.
Characteristics:
1. The properties of compound differ from those of its constituents.
2. Compound has fixed melting point and boiling point.
3. Compound is a homogeneous substance.
4. Constituent elements can be separated by chemical process.
Posted by Swajay Takale 9Thb 4 years, 2 months ago
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Gaurav Seth 4 years, 2 months ago
Atom
Atoms are the smallest particles of an element which can take reaction.
Size of an atom: Atomic radius is measured in nanometres.
Atomic radii of hydrogen atom = 1 × 10–10 m.
Posted by Richa Singh 4 years, 2 months ago
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Gaurav Seth 4 years, 2 months ago
The mixture of two miscible liquids such as kerosene and petrol whose boiling points differ by more than 25°C can be easily separated by the technique of simple distillation. The separation is based upon the principle that the boiling point of more volatile (low building liquid of the mixture. The vapour almost exclusively consists of the more volatile liquid Likewise at the boiling of the less volatile (high boiling) liquid, vapours almost entirely consists of the less volatile liquid since the more volatile liquid has already distilled over.
Posted by Simran Dumra 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
The fluid mosaic model of the plasma membrane. Protein, lipid, and carbohydrate components of the membrane.
Posted by Hanshika (Honey) 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
The reason is that at the moment the ball was thrown, the ball was in motion along with the person and the train, due to the inertia of motion. So during the time ball remains in air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
Posted by Harleen Kaur 4 years, 2 months ago
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Posted by Jiya Pasare 4 years, 2 months ago
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Sunitha Anil 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Plant cells are known to have bigger vacuoles than that of animal cells as they need to store food and water. This is because the plant don't possess the ability to move freely like that of animals. Thus, they possess alrge vacuoles as a reservoir in unfavourable conditions.
Posted by Maitri Gohel 4 years, 2 months ago
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Posted by Jiya Pasare 4 years, 2 months ago
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Lucky Girl Lucky 4 years, 2 months ago
Posted by Jiya Pasare 4 years, 2 months ago
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Deepanshu Vats 4 years, 2 months ago
Posted by Jiya Pasare 4 years, 2 months ago
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Soumya Phattepur 4 years, 2 months ago
Divya Gupta 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Proteins are produced in RER (Rough Endoplasmic Reticulum). Proteins are produced in the RER by the ribosomes attached to it.
Ribosomes are produced in cytoplasm and mitochondria’s chloroplast. RNA present in ribosomes plays a significant role in the synthesis of proteins. This synthesis is called translation as the protein compound is formed from amino acid and the amino acid structure is decoded from genes.
Posted by Jiya Pasare 4 years, 2 months ago
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Soumya Phattepur 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Lysosomes are known as suicide bags of the cell because they contain lytic enzymes capable of digesting cells and unwanted materials.
When lysosomes burst, the lytic enzymes within the organelle spill all over the cell, rupturing the cell membrane or cell wall and inducing the death of the cell.
Posted by Jiya Pasare 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
Circular flow of income.
Circular flow of income refers to continuous circular flow of money income and flow of goods among major sectors of an economy. Flow of money is the aggregate value of goods and services either as factor payments or as expenditure on goods and services. It is circular in nature because it moves in a circle coming back to the starting point. Again it is circular becuase it has neither any beginning nor an end. How? Suppose in an economy, there are two sectors, namely, Household sector and Firm sector. Households supply factor services and spend their income on consumption. The firms hire/purchase factor services from households and produce goods and services. The households as owners of factors of production (land, labour, capital and enterprise) receive the payments in terms of money as reward for rendering productive services. The recipients of these incomes (i.e., households), in turn, spend their incomes on purchase of goods and services (produced by firms) to satisfy their wants. Expenditure by households implies income going back to firms (producers of goods and services) making the circular flow of income complete. In short, income is first generated by production units, then distributed among households for rendering productive services and ultimately comes back to production units by way of expenditure by the households. In this way there is circular flow of income as depicted by outer arrows in Fig(a). (An economy has two types of markets — (i) Product market which is for goods and services, and (ii) Factor market which is for factors of production.)
Posted by Jiya Pasare 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
The major differences between bacterial cell (prokaryotic) and onion peel (eukaryotic) are tabulated below
| Bacterial cell | Onion peel |
| 1. Size of a cell is generally small (1-10 mm) | 1. Size of a cell is generally large (5-100 mm). |
| 2. Nucleus is absent (nuclear region or nucleoid is not surrounded by a nuclear membrane.) | 2. Nucleus is present (nuclear material is surrounded by a nuclear membrane). |
| 3. ft contains a single chromosome. | 3. It contains more than one ' chromosome. |
| 4. Nucleolus is absent | 4. Nucleolus is present. |
| 5. Membrane bound cell organelles are absent. | 5. Membrane bound cell organelles such as mitochondria, plastids, endoplasmic eticulum, Golgi apparatus, lysosomes, peroxisomes, etc., are present. |
| 6. Cell division takes place by fission or budding (no mitosis). | 6. Cell division occurs by mitotic of meiotic cell division. |
Posted by Pankaj Parmar Parmar 4 years, 2 months ago
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Damini Umarvaishy 4 years, 2 months ago
Posted by Anvesha Baranwal 4 years, 2 months ago
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Gaurav Seth 4 years, 2 months ago
Cardiac muscles are involuntary muscles which are mainly controlled by the autonomic nervous system. It has certain peculiar characteristics like they are cylindrical in shape. They are branched and have striations of contractile protein like actin and myosin. These are majorly involved in involuntary contraction of cardiac muscle. They are generally multinucleate.
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Kajal Sharma 4 years, 2 months ago
1Thank You