Watson and Crick had prepared a scheme for replication of DNA when they proposed the double helical structure of DNA. The scheme suggested that the two strands would separate and each act as a template for synthesis of new complementary strand. After complete replication each DNA molecule would have one parental and one newly synthesized […]
Replication of DNA Read More »
Palaeontology: The study of fossils is known as Palaeontology. Father of palaeontology is Leonardo da Vinci. Fossils found in the rock support organic evolution. Rocks are formed by sedimentation and a cross section of earth crust indicates the arrangement of sediments of different ages of different life forms which probably died during the formation of
Evidences For Evolution Read More »
Many scientists worked and gave their results in search of DNA is a genetic material. The final proof for DNA as the genetic material came from the experiment of Alfred Hershey and Martha Chase (1952), who worked with bacteriophage. Bacteriophage are the viruses that infect bacteria and they have a protein coat and DNA. Experiment:
Hershey & Chase Experiment Read More »
Many scientists contributed to prove that DNA is a genetic material. Fredrick Griffith was the first scientist in this race and he had given the transformation principle in bacteria. Fredrick Griffith (1928) conducted a series of experiments with Streptococcus pneumoniae, the bacterium causing pneumonia. He observed two strain of this bacteria: Experiment: He concluded that
Transforming Principle By Frederick Griffith Read More »
Types of Carbohydrates: Carbohydrates are usually divided into the following classes: Monosaccharide: Monosaccharides are the simplest carbohydrates and the building blocks of the more Complex carbohydrates. Sugar containing 3-6 carbons atoms are known as monosaccharides. They may exist in a open chain (mostly from 3 to 5 carbon) or in a ring chain configuration (more
What are Carbohydrates Read More »
The following questions consist of two statements, one labelled as Assertion (A) and the other labelled the Reason (R). Examine these two statements carefully and select the most appropriate answer codes.A. Assertion and reason both are correct and reason is the correct explanation of Assertion.B. Assertion and reason both are correct and reason is not
Reproduction Unit Assertion and Reason Questions Read More »
This post contains the MCQ for the three chapters Principles of Inheritance and Variations, Molecular Basis of Inheritance and Evolution in Class 12 Biology Multiple Choice Questions a. I and III are correctb. I and IV are correctc. II and III are correctd. II and IV are correct Answersheet
