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Chapter 1.

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Chance Williams

on 31 August 2016

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Transcript of Chapter 1.

Chapter 1.
Why must Science be fundementally uncertian?
So it can change with new information.
Describe the big ideas in Biology?
Why then study science?

Science can help with critical thinking
Describe the characteristics of life.
Describe the differences between covalent and ionic bonds.
Explain the importance to life of each of the following: carbohydrates, lipids, nucleic aids, and proteins.

Describe how enzymes affect chemical reactions.

Cellular Basis of life-Many living things consist of only a single cell, they are called unicellular organisms. Many plants and animals are multicellular. They come in many sizes shapes and functions. The human body contains over 200 types.

Information and Heredity- Living things are based on a genetic code. The information coded in DNA forms an unbroken chain that stretches back roughly 3.5 billion years. Yet, the DNA inside your cells right now can influence your future. your risk of getting cancer, the amount of cholesterol in your blood, and the color of your children hair.

Matter and Energy- Living things obtain and use material and energy. Life requires matter that serves as nutrients to build body structures. Plants usually use sunlight. Animals eat plants and other animals.

Growth, Development, and Reproduction- All living things need to reproduce.

Homeostasis- living things need to maintain homeostasis to be relatively stable.

Evolution-Living things evolve. Evolutionary theory is the central organizing principle of all biological and biomedical sciences.

Structure and Function-Each major group of organisms has evolved their own particular body part.

Unity and Diversity of life- Although life takes an almost unbelievable variety of forms, all living things are fundamentally similar at the molecular level.

Interdependence in Nature- All forms of life on Earth are connected into a biosphere, Which literally means "living planet."

Science as a way of knowing- Science is not a list of facts, but "a way of knowing."The job of science is to use observations, questions, and experiments to explain the natural world in terms of natural forces and events.

Living things respond to their environment.
living things are based on a universal genetic code called DNA.
Living things grow and develop.
Living things respond to their environment.
Living things are made up of cells.
Living things reproduce.
Living things maintain a stable internal environment.
Living things obtain and use material and energy.
taken as a group living things evolve.
In an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are bound by shared electrons.

Carbohydrates provide your body with energy.

Your body uses fats, oils and acids contain lipids, as a supply and store of energy: a gram of fat or lipids contains more than double the amount of energy present in a gram of carbohydrate.

Nucleic acids store and transmit genetic information that you inherited from your parents.

Proteins do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs.
Enzymes function by lowering the activation energy of reactions. By bringing the reactants closer together, chemical bonds may be weakened and reactions will proceed faster than without the catalyst.
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