Question

1.How could studying chemosynthetic organisms help scientists better understand the development of life on Earth?

2. Why might fatty acids, amino acids and nucleic acids raise the concentration of hydrogen ions in a solution?

3. A company that makes nutritional products develops a new type of protein drink for athletes. One of the company's scientists studies the pH at which a digestive enzyme better breaks down the different proteins in the drink. The scientist uses the following experimental procedure: Five test tubes with 2 ml of protein drink in each. Five different solutions include the same digestive enzyme, but each solution has a different pH: 1.5, 2.0, 2.5, 3.0, and 3.5. A solution containing the enzyme is added to each test tube with protein drink. Protein levels in each of the five test tubes are measured.

Answer the following questions using the previous situation:

What are the independent and dependent variables of the experiment?

Explain Apply: In many experiments, time is used as a dependent variable. Describe how time could be used as a dependent variable in this experiment.

4. Argument on the following idea: "Nutrients can circulate, but energy cannot."

Answer 1

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(1). Gradually organic compou was used as Carbon source as well as other organic Compounds (such as succinic acid) for Synthesis of molecules. It requires electron donor (reducing cegent or reductant). Ha and H₂S was available reductants, so Chemosynthesis evolved. • The use of Hes and other compounds restricted distribution of organisms, so, new resources Searched out and the resource was sunlight. The iron (fe) containing 'Cytochromes' and 'Porphyrin' compound evolved for light trapping. The first life was Nutritionaly chemo heterotrophic. o chemo synthetic theory Suggested that the development of life on earth is probable in what ever place the proper chemical and physical conditions are in place. gt also suggests that all the lifes on the Earth evolved from a common ancestor.