During this part of the exercise you will learn to identify and name the molecul

Question

During this part of the exercise you will learn to identify and name the molecules that are important to living systems. You will learn the functions of each, their chemical composition, and their structural units. When you have completed this part of the exercise, you will be able to recall that living things are composed of one or more of these organic compounds. Living things are compounds of the same elements as non-living matter. There is no special "life" element that is present only in living matter. The chemical elements and their activities, as well as the general characteristics of living things (growth, irritability, metabolism, adaptability, and reproduction), help to identify the special condition called "life." Water is a molecule that is important to living system. Water is composed of two atoms of hydrogen and one atom of oxygen (H_2 O). The functions of water in living systems are: a. Take part in some reactions b. Serve at a medium or solvent foe other reactions. c. Serve as a carrier substance for the transportation of materials. Carbon dioxide (CO_2) is involved in both respiration and photosynthesis (to be discussed in another unit as well as controlling other activities. Oxygen (O_2) is required by almost all organisms in the process of releasing energy in the cell. Ammonia (NH_3) is a molecule that is released by the decomposition of living organisms. The nitrogen (N) in this molecule is recycled and is necessary to rebuild living matter. Match the following molecules with their symbols a. Water NH_3 b. Carbon dioxide O_2 c. Ammonia CO_2 d. Oxygen H_2 O a. H_2 O b. CO_2 c. NH_3 d. O_2 The substance that serves as a carrier for the transport of materials __________ water A compound that ii involved in photosynthesis and respiration _____________ carbon dioxide

Explanation / Answer

9. a. Water - H2O

b. Carbon dioxide - CO2

c. Ammonia - NH2

d. Oxygen - O2

10. Water serves as a carrier for the transport of materials in a living body. It helps to transport different essential nutrients that are important for the body to function properly. It is also a main component of blood, thus transporting materials is much easier.

11 A compound that is involved in photosynthesis and respiration is carbon dioxide. Plants absorb environmental carbon dioxide which is a raw material of the process of photosynthesis. This carbon dioxide is exhaled by living beings. Thus, carbon dioxide is involved in a cycle of photosynthesis and respiration.

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