Chapter 2 Its Alive Or, Is It

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Chapter 2 Its Alive!! Or, Is It?

• p. 34-50

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What are the characteristics of Living things???

• 1. Living things have cells
• A cell is a membrane-covered
• Structure that contains all the
• Materials necessary for life
• 2. Living things sense and respond to change
• A stimulus is a change in the
• Organisms environment which
• Affects the activity of the organism

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What is Homeostasis??

• Homeostasis the maintenance of a stable
  internal environment.. An organisms happy
  place if you will

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3. Living things reproduce

• Asexual reproduction a single parent produces
  identical offspring. Ex) bacteria
• Sexual reproduction two parents produce
  offspring which share characteristics of both
  parents. Ex) people

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4. Living things have DNA

• What is DNA? Deoxyribonucleic Acid is a special
  molecule which has all of the instructions for
  making the proteins that comprise our bodies.
• This DNA is the basis of heredity. (the
  transmission of characteristics from one
  generation to the next)

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5. Living Things use Energy

• Our metabolism is the total of all of the
  chemical activities that we perform.
• Probably a high
• Metabolism!!!

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Living Things Grow and Develop

• We grow by making new cells, not by making our
  current cells bigger.

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The Simple Bare Necessities of Life

• Food producers, consumers, and decomposers all
  play different roles.
• Water Almost 70 of our cells are water.
• Air A mixture of gases which is necessary for
  many chemical processes
• A place to Live habitat and shelter are
  necessities for all living things.

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Producer, consumer, or decomposer??
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The Chemistry of Life all living things are
made of cells, but what are cells made of?

• 1. Proteins large molecules
• which make up amino acids
• Carbohydrates compounds
• made of sugars
• Lipids compounds that cannot
• mix with water. Phospholipids are molecules
  which make up the cell membrane.

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Nucleic Acids the Cells Fuel

• N.Acids compounds made up of subunits called
  nucleotides. These N. Acids make up our DNA
• ATP the major fuel used for all cell
  activities. We make ATP from the foods that we
  eat. It is like our gasoline