Ask questions, doubts, problems and we will help you..
Ask questions which are clear, concise and easy to understand.
Ask Question
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Ayush Thakur 5 years, 2 months ago (8209486)
- 2 answers
Posted by Ayush Thakur 5 years, 2 months ago (8209486)
- 2 answers
Posted by Mohd Farhan 5 years, 2 months ago (9871430)
- 0 answers
Posted by Sunayana Panigrahi 5 years, 2 months ago (9135124)
- 3 answers
Om Parakash 5 years, 2 months ago (9216221)
Suranjana Panigrahi 5 years, 2 months ago (9125157)
Avni Sreeram 5 years, 2 months ago (9020723)
Posted by Mohit Chauhan 5 years, 2 months ago (9243476)
- 5 answers
Kartik Gupta 5 years, 2 months ago (9910429)
Posted by Mohd Farhan 5 years, 2 months ago (9871430)
- 3 answers
Posted by Vanshika Xxxx 5 years, 2 months ago (8714248)
- 1 answers
Yogita Ingle 5 years, 2 months ago (2577571)
The DNA structure can be thought of like a twisted ladder. This structure is described as a double-helix, as illustrated in the figure above. It is a nucleic acid, and all nucleic acids are made up of nucleotides. The DNA molecule is composed of units called nucleotides, and each nucleotide is composed of three different components, such as sugar, phosphate groups, and nitrogen bases.
The basic building blocks of DNA are nucleotides, which are composed of a sugar group, a phosphate group, and a nitrogen base. The sugar and phosphate groups link the nucleotides together to form each strand of DNA. Adenine (A), Thymine (T), Guanine (G) and Cytosine (C) are four types of nitrogen bases.
These 4 Nitrogenous bases pair together in the following way: A with T, and C with G. These base pairs are essential for the DNA’s double helix structure, which resembles a twisted ladder.
The order of the nitrogenous bases determines the genetic code or the DNA’s instructions.
Among the three components of DNA structure, sugar is the one which forms the backbone of the DNA molecule. It is also called deoxyribose. The nitrogenous bases of the opposite strands form hydrogen bonds, forming a ladder-like structure.
The DNA molecule consists of 4 nitrogen bases, namely adenine (A), thymine (T), cytosine (C) and Guanine (G) which ultimately forms the structure of a nucleotide. The A and G are purines and the C and T are pyrimidines.
The two strands of DNA run in opposite directions. These strands are held together by the hydrogen bond that is present between the two complementary bases. The strands are helically twisted, where each strand forms a right-handed coil and ten nucleotides make up a single turn.
The pitch of each helix is 3.4 nm. Hence, the distance between two consecutive base pairs (i.e., hydrogen-bonded bases of the opposite strands) is 0.34 nm.
Posted by Ritika Morya 5 years, 2 months ago (9905039)
- 3 answers
Har Har Mahadev 🙏 5 years, 2 months ago (5614857)
Posted by Ritika Morya 5 years, 2 months ago (9905039)
- 0 answers
Posted by Pk ⚔️ 5 years, 2 months ago (9588571)
- 2 answers
Yogita Ingle 5 years, 2 months ago (2577571)
Enthalpy is the measurement of energy in a thermodynamic system. The quantity of enthalpy equals to the total content of heat of a system, equivalent to the system’s internal energy plus the product of volume and pressure.
Posted by Pritam Debnath 5 years, 2 months ago (9192455)
- 1 answers
Posted by Abaad Shaikh Shaikh 5 years, 2 months ago (9432060)
- 0 answers
Posted by Shalbatstone Marweiñ 5 years, 2 months ago (9921152)
- 1 answers
Geet Garg 5 years, 2 months ago (917530)
Posted by Abaad Shaikh Shaikh 5 years, 2 months ago (9432060)
- 1 answers
Yogita Ingle 5 years, 2 months ago (2577571)
1. Arab's Contribution in the Field of Science :
(i) The Arabs produced great physicians like Al-Razi and Ibn-Sina who respectively discovered the true nature of smallpox and tuberculosis. They organised hospitals, for the treatment of the infectious diseases.
ii). In Mathematics the Arabs spread the knowledge of numbers and trigonometry in the other regions of the world Omar-Khayyam a great Mathematicians of Arab devised a calendar which is more accurate than the present Christian Calendar.
iii). The Arab astronomers believed that the earth revolves round the sun.
iv). In Chemistry, the Arbs discovered many new compounds like sodium carbonate, silver nitrate, Nitric and sulphuric acids.
2. Arab's Contribution in the Field of Culture :
i). In literature, the Arab classic "The Arabian Nights" a collection of 1001 stories "Rubaiyat" by Omar Khayyam, "Shahnama" by Al-Firdausi are famous all over the world.
ii). The buildings of the Arabs and bulb like domes, small minarets, horse shoe arches and twisted columns.
3. Arab's Contribution in other Fields :
i). The Arabs propounded the ideal of equality and brotherhood.
ii). Arab carpets, leather work, metal work, beautiful, swords and enamelled glass.
Posted by Pk ⚔️ 5 years, 2 months ago (9588571)
- 1 answers
Sia ? 4 years, 6 months ago (6945213)
Posted by Abaad Shaikh Shaikh 5 years, 2 months ago (9432060)
- 1 answers
Yogita Ingle 5 years, 2 months ago (2577571)
The Crisis of the Fourteenth Century
In Europe economic expansion slowed down. This was due to three factors:
- In Northern Europe, by the end of the thirteenth century the warm summers of the previous 300 years had given way to bitterly cold summers. Seasons for growing crops were reduced by a month.
- Trade was hit by a severe shortage of metal money because of a shortfall in the output of silver mines in Austria and Serbia. This forced government to reduce the silver content of the currency and to mix it with cheaper metals.
- Ships carrying goods from distant countries had started arriving in European ports. The ships came with rats carrying deadly bubonic plague infection (the Black Death).
Posted by Pk ⚔️ 5 years, 2 months ago (9588571)
- 1 answers
Posted by Abaad Shaikh Shaikh 5 years, 2 months ago (9432060)
- 1 answers
Yogita Ingle 5 years, 2 months ago (2577571)
- Education spread in Italy by the 13th and 14th centuries.
- Humanism as a subject was first taught in Italian schools, colleges and universities. Italian people were made aware of humanist views and ideas.
- Universities were first of all developed here to spread education.
- A number of classical books were composed by Roman and Greek scholars.
Posted by Abaad Shaikh Shaikh 5 years, 2 months ago (9432060)
- 0 answers
Posted by Andeson Gaming 5 years, 2 months ago (9921182)
- 1 answers
Yogita Ingle 5 years, 2 months ago (2577571)
The social division takes place when some social difference overlaps with other differences. Situations of the kind when one kind of social difference becomes more important than the other and people start feeling that they belong to different communities, gives rise to the social divisions.
Posted by Har Har Mahadev 🙏 5 years, 2 months ago (5614857)
- 5 answers
Sahil Singh 5 years, 2 months ago (9869880)
Posted by Pk ⚔️ 5 years, 2 months ago (9588571)
- 0 answers
Posted by Pk ⚔️ 5 years, 2 months ago (9588571)
- 0 answers
Posted by Sm .. 5 years, 2 months ago (7808438)
- 0 answers
Posted by Anmol Singh Chhabra 5 years, 2 months ago (9864817)
- 1 answers
Yogita Ingle 5 years, 2 months ago (2577571)
The resistance of an ammeter should be very small so that it may not change the value of the current flowing in the circuit.
Posted by Bhumika Garg 5 years, 2 months ago (2274797)
- 1 answers
Posted by Rupinder Kaur Sandhu 5 years, 2 months ago (9034425)
- 0 answers
Posted by Sm .. 5 years, 2 months ago (7808438)
- 1 answers
Posted by Pk ⚔️ 5 years, 2 months ago (9588571)
- 0 answers
Posted by മുഹമ്മദ് Aqsin Manu 5 years, 2 months ago (9918747)
- 5 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Sayukta Singh 5 years, 2 months ago (11153050)
0 Thank You