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Swathi S.
Tutor for 2 years -Biology
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Food Science
TutorMe
Question:

how many essential nutrients does the human body need? 10 20 30 40

Swathi S.
Answer:

2. Human perform several tasks in their life span. To perform all these tasks they need energy that is obtained from the nutrition. Nutrition is a process of obtaining or supplying nutrients. There are essential and non-essential nutrients in the environment. Non-essential nutrients are the nutrients that are produced in the body. There are also so many nutrients that a human body cannot produce but are essential for the human growth. These are called essential nutrients. The main essential nutrients called carbohydrates, proteins, fats, vitamins, minerals, and water. Hence the correct option is 10.

Environmental Science
TutorMe
Question:

Briefly describe the nine properties of life and discuss how things like a virus, prion, and viroid can reproduce, but are not considered to be alive. Address the question: how can things like these that are not considered to be alive “evolve”?

Swathi S.
Answer:

Biology is the study of living things means the study of life. Life is a process to arrange, metabolize, work out, expel for an act, reproduce, development, heredity, evolution and adaptation. To understand these terms there should be an explanation. The term order refers to the systemic arrangement of the structure in a well manner. To understand this human body organs arrangement is an example. Then the metabolism refers to chemical reactions that occur in the body to produce energy thus this property helps in the further development. The third property is mobility o r to work out that is the movement of an individual by their own. Expel or responding to an event or an act is the fourth property that helps in adopting to the environment. Reproduce is a property that makes the life going on from generation to other. The sixth property is the development that is done is throughout the life span of an organism. The development thus leads to the heredity a unit that is responsible for the passing of the chemical component of life called the DNA and genes. Evolution is the unit of change in a course of time. This makes an organism to overcome the challenges that occur in an environment. These evolutionary changes thus adapted by the organism that is the ninth property of the life and makes an organism fit in the universe called the survival of fittest. Viruses are the microorganisms that are not visible to the naked eye but present everywhere. Prions are the components of proteins. Viroids are the plant pathogens that they attack the plants and harm them. Though all of these three able to reproduce but cannot make themselves. They are totally dependent on the other living organisms for the basic properties like reproduce, nutrition, adaptation and growth. Thus these organisms are not considered to be alive as they cannot do all things alone.

Biology
TutorMe
Question:

Griffith’s critical experiment was injecting mice with both living IIR (avirulent) and heat killed IIIS strains at the same time. Why then did he also inject mice with 1) living IIIS strains (virulent), 2) living IIR strains, and 3) heat-killed IIIS strains?

Swathi S.
Answer:

Pneumcocci is a bacteria that exits in two forms the R from called as rough form as it do not contains slippery polysaccharide capsule and so considered to be avirulent that causes no harm. The other form is the S form called as smooth form as it not contains slippery polysaccharide capsule and so considered to be virulent that causes harm when injected to an individual. Griffith’s experiments are on the mice injected both the strains individually and in combination of both these strains. (R and S) The live S form caused death of the mice and the live form of R did not induce death of the mice. But when the S form is heat killed unexpectedly the mice is alive as the ability of virulence is gone. Then he performed an experiment by injecting the heat killed S form and live R form in combination this also caused the death of the mice. This clearly illustrated that the transformation has done between the S form and R form. This is confirmed by taking the blood sample of the dead mice and found live S form cells in that sample.

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