A. Concept of Life
1)Obtain general understanding of some of the material that will be covered this week, and get familiarized with many of the important terms given below. Understand the basic life functions that exist and complete the required activities as described below, which should offer further insight into the general concepts. 2)Provide introduction to using Word as a word processor.
1.Definition of Life
Modern scientists have been unable to agree upon a single definition of life. However, most biologists characterize life by the functions that living organisms perform.
The life functions include the many activities carried on by all living things. Whether the life functions are the activities of cells or an organism composed of cells, these functions are basically the same.
a) Nutrition: includes the activities of an organism by which it obtains materials and energy from its environment and processes them for its use.
b) Transport: involves the absorption and distribution of materials by an organism.
c) Respiration: Includes those processes which provide the energy necessary for the maintenance of life functions.
d) Excretion: involves the removal from the organism of waste products manufactures by the organism.
e) Synthesis: involves those chemical activities by which large molecules or structures are built from smaller ones.
f) Regulation: involves the control and coordination of the various activities of an organism through responses to change both around and within the organism.
g) Growth: involves an increase in cell size and/or cell numbers. This process utilizes the products of synthesis.
h) Reproduction: involves the production of new individuals from preexisting ones. The reproduction of cells is also responsible for the growth of an organism and the repair of tissue.
Metabolism, the key to "survival"
Metabolism if the total of all the life activities required to sustain life. Each life process is chemical in nature ans may be affected by both physical and chemical conditions within its internal and external environment.
Homeostasis, key to the "quality of life"
Life functions are carries out by an organism in an integrated manner that results in the maintenance of a stable internal environmant. This maintenace is known as homeostasis. Homeostasis refers to the organism's ability to coordinate and control its many chemical reactions.
Complete the following quiz below which will be collected at the end of class.
1) For survival, a hummingbird uses a considerable amount of energy. This energy most
directly results from the life activity of
a) transport b) excretion c) regulation d) respiration
2) Which life function provides substances
that may be used by an organism for its
growth and for the repair of its tissues?
a) excretion b) reproduction c) nutrition d) regulation
3) The term that represents all the chemical
activities that occur in an organism is
a) synthesis b) regulation c) metabolism d) homeostasis
4) Which life function includes processes
responsible for an animal being able to react
in a coordinated manner to changes in its environment?
a) reproduction b) synthesis c) nutrition d) regulation
5) A paramecium absorbs materials from its
environment and circulates these materials
throughout its cytoplasm. Which life function is described by these activities?
a) synthesis b) reproduction c) respiration d) transport
6) Organisms release stored chemical energy
from nutrients by the process of
a) assimilation b) transport c) respiration d) ingestion
7) Which term is used to represent all of
the physiological activities being maintained
in a balance?
a) regulation b) metabolism c) synthesis d) homeostasis
8) In plants, the production of poisons ,
drugs, waxes, and fibers is a direct result of
a) respiration b) digestion c) hydrolysis d) synthesis
9) The control of all physiological activities
of an organism is necessary to maintain
that organism's stability in its environment. This life activity is known as
a) nutrition b) transport c) respiration d) regulation
10) Which life activity is not required for
the survival of an individual organism?
a) nutrition b) reproduction c) respiration d) synthesis
Open up the program Word. Choose New from the File Menu. Choose what size fonts you would like, as well as what type of font. In one or two paragraphs summarize the main concepts learned in this section. After you have completed your summary, save the document on a disk by coosing File then Save As, and type in the name you would like to call your document.