Biology Semester 1 Review

Which of these can change when new evidence is presented?

• theory

• law

Scientific theories are based on

• general assumptions of how systems work.
• mathematical principles that can be proven true.
• large amounts of data collected over time.
• observations from within only one scientific discipline.

What  are the three parts of the cell theory?

• all living things are unicellular; the cell makes up everything; cells come from free cell formation
• all things are made of cells; the cell is the basic unit of life; cells come from other cells
• All living things are made of one or more cells; the cell is the basic unit of life; all cells come from other cells
• Cells are cool; cells are fun; let's all eat a cinnamon bun

Which of the following is a generalized description of a fact of nature that is observed over and over again? 

• scientific theory
• scientific law
• hypothesis
• observation 

Who first observed cells using a piece of cork & coined the term "cell?" 

• Robert Hooke
• Anton van Leeuwenhoek
• Matthias Schleiden
• Theodor Schwann

What is this graph showing you?

• The worlds population has been growing and will continue to grow

• The worlds population was growing but now is decreasing

• The worlds population is staying the same

What property of water allows it to be such a versatile solvent that it is often called the "universal solvent?"

• Purity
• Polarity and cohesion
• High heat capacity
• Expansion upon freezing

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
  
• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
  

Why does water move from the roots to the leaves of plants?

• Water is pushed by solutes
• Capillary action pulls the water molecules like a chain
• Water is pulled by gravity
• Water’s cohesion causes it to “pull” towards the leaves

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds