Warm-Up (10/26) Answer the following questions, and explain in a complete sentence why each answer is correct. Name Date Period Which of the following questions about a flower can be most readily answered by scientific methods? A. Would this kind of flower make a good gift? B. What kind of flower is the most beautiful? C. How pretty is the flower? D. What kinds of pollinators are attracted to this flower? By what process is the carbon in fossil fuels released into the atmosphere? A. combustion B. decomposition C. erosion D. respiration
Cell Theory
History Cells were unknown until the discovery of microscopes in the 1650’s two scientists working independently built the first microscopes Anton von Leeuwenhoek in Holland Robert Hooke in England
Robert Hooke Born: July 18, 1635 Died: March 3, 1703 Who Born: July 18, 1635 Died: March 3, 1703 He lived in the United Kingdom. He was an architect, naturalist, and scientist.
Hooke He worked with microscopes. He studied cork a kind of tree bark. What He worked with microscopes. He studied cork a kind of tree bark. He discovered plant cells in the bark.
Hooke How While looking at a piece of cork under the microscope, he saw tiny pores or small compartments. He named the structures he saw “cells” because they reminded him of the small rooms monks slept in.
Hooke Why His cell discovery was important because his findings led to the scientific study of cells. (cell biology)
Anton van Leeuwenhoek Born: October 24, 1632 Died: August 30, 1723 He is known as the “Father of Microscopy”
Leeuwenhoek Studied pondwater, sour milk, and semen named moving organisms “animalcules”
Leeuwenhoek’s drawings of “animalcules” set off a flurry of amateur and sometimes ridiculous claims, such as: - pondwater animalcules causing madness!
Matthais Schleiden Born: April 5, 1804 Died: June 23, 1881 German botanist Discovered that all plants were made of cells Contributed to the creation of the cell theory.
Easy Question of the day… You are going to share your answer with the person next to you. Where do babies come from? It seems so simple, but it wasn’t always.
What they used to think. Human sperm cells contain tiny human beings! Today we can look back and think “crazy,” but at the time people took these ideas very seriously.
Theodor Schwann Born: December 7, 1810 Died: January 11, 1882 German zoologist Concluded that all animals are made of cells. Contributed to the creation of the cell theory.
Rudolph Virchow Born: October 13, 1821 Died: September 5, 1902 German pathologist He is known as the “Father of Pathology” Discovered that all living cells come only from other living cells.
The Cell Theory The cell theory has three parts: All living things are .. Made of one or more cells Cells are the... Smallest working unit of living things All cells come from.. Preexisting cells through cell division
The Cell Theory The cell theory has three parts: All living things are .. Made of one or more cells By Schwann and Schleiden
The Cell Theory The cell theory has three parts: Cells are the... Smallest working unit of living things By Schwann and Schleiden
The Cell Theory The cell theory has three parts: All cells come from.. Preexisting cells through cell division Virchow
Before the cell theory: Spontaneous Generation From pre-historic times to about 1850, most people believed that under the right conditions, living things could spontaneously appear from non-living material.
People throughout the Middle Ages believed that mice could be “created” spontaneously by putting grain in dark, quiet place and leaving it for a few weeks. BILL NYE 3 min
Finally... in the late 1870’s, doctors start to wash their hands and instruments before operating...some even start wearing gloves! Joseph Lister’s wacky idea that antiseptics kill germs catches on...
The cell theory is one of the most important theories in biology. All living things contain at least one cell Cells are the smallest living units of matter Cells can only come from pre-existing cells
Closure Answer the following question in a complete sentence: Name Date Period Describe the difference between Hooke’s and Leeuwenhoek’s discoveries. The difference between Hooke’s and Leeuwenhoek’s discoveries is… Scale from 1-10