Viruses are non living outside the body. They contain genome DNA or RNA but cannot grow independently. Instead, they need a host organism for its survival as they use genetic instructions of host organism. 1. They can only reproduce in host cells and use same mechanisms as the host cells. Therefore, it is difficult to […]
Virus is non living outside the body. They contain genome DNA or RNA but cannot grow independently. Instead, they must need a host organism for its survival as they use genetic instructions of host organism. Therefore, they can only reproduce in host cells. When virus enters the body, it must be in active or in […]
Discovery of Nucleic Acids- Friedrich Miescher, 1869 Miescher used white blood cells as they are main component of pus in infections. His revealed that nuclei of pus cells contained material that contained nitrogen and phosphorus. He called that chemical as “nuclein” as it found in nuclei and later known as nucleic acid.
Answer: No ecosystem cannot survive without consumers. Explanation: A consumer is a heterotroph that cannot make its own food and eat producers or other organisms for energy. We are in the category of consumers that eat the food that producers like plants made. Consumers in an ecosystem balance the food chain by keeping plant populations […]
Answer: During puberty stage, endocrine System is most active. Explanation: The endocrine system is defined as glands that secretes hormones. Hormones regulate growth and development, metabolism, reproduction, sexual function and many other functions. Therefore, endocrine glands get their job done through production of hormones. Growth hormone (GH) regulates the growth of body and is most […]
Viruses are non living outside the body. They contain genetic material (DNA or RNA) but cannot grow independently. Instead, they need a host organism for its survival as they use host genetic instructions. Contagious is defined as the ability of a virus to be transmitted from one person to another. Contagious diseases can be spread […]
To preserve food means is to slow down the activity of enzymes and microbes that spoil the food. They cannot survive in acidic conditions, in high temperature or in high salt or sugar concentrations. Different techniques are used in different food items. To preserve tomatoes, first make puree of tomatoes and put it in freezer. […]