Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Пособие.Увлекательный мир биологии.doc
Скачиваний:
0
Добавлен:
01.07.2025
Размер:
630.78 Кб
Скачать
  1. Practice the following for pronunciation:

biology

nature

hierarchy

biophysics

natural

component

biochemistry

naturalist

metabolism

biomedicine

molecule

sociobiology

multicultural

3. Think of the translation of the following word combinations:

unifying concept

in an integrated way

to receive the greatest stimulus

to make fundamental contribution

conventional segregation

nucleic acids

living matter

major breakthrough in modern science

the basic structural unit

natural habitats

province of biology

4. Give nouns corresponding to the verbs:

segregate – ...

domesticate – ...

speculate – ...

apply – ...

transit – ...

investigate – ...

determine – ...

appreciate – ...

contribute – ...

act – ...

Text a Biology

Biology may be defined as the science of life. The word "biology" is derived from the Greek words "bios" – life and "logos" – word (by extension – study of science). The term was introduced in Germany in 1800 and popularized by the French naturalist Jean-Baptiste de Lamarck as a means of encompassing the growing number of disciplines involved with the study of living forms. The unifying concept of biology received its greatest stimulus from the English zoologist Thomas Henry Huxley, who was also an important educator. Huxley insisted that the conventional segregation of zoology and botany was intellectually meaningless and that all living things should be studied in an integrated way. Living things are in general called organisms, and a good deal of time in General Biology is spent in consider­ing the great variety of such organisms. In this great variety there are peculiarities in organization on the basis of which organisms may be classified. In studying a particular group of organisms we shall be concerned both with the structural (morphological) characteristics – how organism is built – and with the functional (physiological) characteristics – how it carries on its vital operations. We shall also be concerned with an organism's place in the natural world around it (ecology) and specifically its relationship to man.

Most organisms that we notice may rather readily be identified as either plants or animals. But we shall find that it is not always easy to distinguish between plants and ani­mals, since some groups of organisms have characteristics of both. In the same way, in a great many cases there seems to be no question but that a given thing is living – for instance, a salmon swimming upstream or an apple-tree in bloom. Yet we shall even find it difficult to draw a sharp dividing line between the living and the nonliving. Moreover, modern speculations concerning the origin of life on earth postulate a transition from nonliving matter to living organisms so that in theory a place is left open for forms that will not be easily classified as either living or nonliving.

Huxley's approach to the study of biology is even more cogent today, because scientists now realize that many lower organisms are neither plants nor animals. The limits of the science, however, have always been difficult to determine, and as the scope of biology has shifted over the years, its subject areas have been changed and reorganized. Today biology is subdivided into hierarchies based on the molecule, the cell, the organism, and the population.

Molecular biology, which spans biophysics and biochemistry, has made the most fundamental contributions to modern biology. Much is now known about the structure and action of nucleic acids and protein, the key molecules of all living matter. The discovery of the mechanism of heredity was a major breakthrough in modern science. Another important advance was in understanding how molecules conduct metabolism, that is, how they process the energy needed to sustain life.

Cellular biology is closely linked with molecular biology. To understand the functions of the cell – the basic structural unit of living matter – cell biologists study its components on the molecular level. Organismal biology, in turn, is related to cellular biology, because the life functions of multicellular organisms are governed by the activities and interactions of their cellular components. The study of organisms includes their growth and development (developmental biology) and how they function (physiology). Particularly important are investigations of the brain and nervous system (neurophysiology) and animal behaviour (ethology).

Population biology became firmly established as a major subdivision of biological studies in the 1970s. Central to this field is evolutionary biology, in which the contributions of Charles Darwin have been fully appreciated after a long period of neglect. Population genetics, the study of gene changes in populations, and ecology, the study of populations in their natural habitats, have been established subject areas since the 1930s. These two fields were combined in the 1960s to form a rapidly developing new discipline often called, simply, population biology. Closely associated is a new development in animal-behaviour studies called sociobiology, which focuses on the genetic contribution to social interactions among animal populations.

Biology also includes the study of humans at the molecular, cellular, and organismal levels. If the focus of investigation is the application of biological knowledge to human health, the study is often termed biomedicine. Human populations are by convention not considered within the province of biology; instead, they are the subject of anthropology and the various social sciences. The boundaries and subdivisions of biology, however, are as fluid today as they have always been, and further shifts may be expected.