Practical Science II Chapter 1 Review

1-1 What is Life Science? Study living things Study their environment Lots of specialties Lots of ways to study Biology Part of your daily life

Biology is everywhere in our daily lives !

What specialty deals with this situation?

1-2 What Are Living Things? Organism is a complete, entire living thing They have certain required traits or characteristics You are an organism

Characteristics of Organisms We may use this list of identifiable traits to check on whether something is living (an organism) Living shows all of these traits Dead used to show the traits but not now Non-living never showed the traits or only some of them

Made of 1 or more cells

Use Energy

Adapt to surroundings

Respond to Stimuli

Growth and Development

Reproduction

What is matter? Has mass and occupies space All objects made of matter Matter appears as elements/compounds Elements/atoms:Compounds/molecules Living matter consists of atoms of C, H, O, N, S, and P in different percentages

Element distribution

Organic Compounds Carbohydrates Lipids Proteins Nucleic Acids

Carbohydrates CHO (1:2:1 ratio) Sugars and starches Source of energy in living things Made from photosynthesis and passed on through food chains

Lipids CHO (reduced O) Fats, oils and waxes Store energy when intake is greater than use Made by body and taken in by diet

Proteins CHON Meats, eggs and dairy Build and Repair structures

Nucleic Acids CHONP Code genetic info DNA – deoxyribonucleic acid RNA – ribonucleic acid Build by body

What do organisms need? Energy Water Air Temperature Space For homeostasis – a balance among all the activities of the body

Energy Autotroph Heterotroph Herbivore Carnivore Decomposer

Water 2/3 of your body Dissolve/transport For chemical reactions Support in plants

Air Oxygen for respiration From atmosphere or water Carbon dioxide for photosynthesis Some are anaerobic, like Clostridium botulinum

Temperature Exotherm – cold- blooded Endotherm – warm- blooded Oxygen content of water Small range of temp.

Living Space Area in which to live Provides food, water, sunlight, temperature, air and shelter Can’t be contaminated