1. Monday, December 16 , 2013
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2. Which invention played the biggest role in the discovery of cells by early scientists?
Magnifying glass
Lens
Eyeglasses
Compound microscope D

3. Tuesday, December 17, 2013
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4. all existing cells form by free-cell formation.
The cell theory states that all organisms are made of cells; cells are the most basic unit of life; and
all existing cells form by free-cell formation.
all cells are eukaryotic.
all existing cells are produced by other living cells.
all cells have a nucleus. C

5. Wednesday, December 18, 2013 2 slide bellringer
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6. They all need oxygen to survive.
Which of the following best describes a way in which all living organisms are similar?
They all need oxygen to survive.
They are all made of at least one cell.
They are all adapted to survive in their environment.
They all need energy from other organisms to survive. B

7. Robert Hooke saw the first cork cells under a microscope in 1665, but it wasn't until 1839 that cell theory gained the support it needed to be accepted. Why did it take 174 years for cell theory to become widely accepted?
Microscopes were very primitive in 1665, and no real progress was made on improving them until modern microscopes appeared in the early 1830s.
A great multitude of organisms had to be examined and found to be made of cells before the statement that all living things are made of cells could be trusted.
When Hooke first proposed that all living things are made of cells, the public was so opposed to the idea that no one dared bring it up again for several generations.
Scientists at the time were divided on whether or not cells were living things, and it took generations of debate after the evidence was gathered for a majority to win the fight. B

8. Thursday, December 19, 2013
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Mini-Assessment

9. An organism was found with tissues made of something other than cells.
When scientists set out to test a hypothesis, it is often most practical to try to prove the hypothesis false rather than to prove it is true in all cases. Scientists place great confidence in cell theory, yet it has not been tested in every living thing on the planet. What piece of evidence would cause scientists to decide that cell theory would need to be revised?
An organism was found with tissues made of something other than cells.
A cell was found that could continue to divide and reproduce indefinitely.
An animal cell was found that could harness solar energy as plant cells do.
Cells were found that used something other than DNA as hereditary material. A

10. Friday, December 20, 2013
Human Biology DI