Part 1 - Life is Cellular Flashcards
What did Robert Hooke do?
In 1665, he used a microscope to look at a slice of cork (plant material), called the chambers “cells”
What did Anton van Leeuwenhoek do?
In Holland, he used a microscope to observe pond water and discovered what we now call bacteria
What did German botanist Matthias Schleiden conclude?
That all plants are made of cells
What did German biologist Theodor Schwann state?
That all animals are make of cells
In 1885, what did German physician Rudolf Verchow conclude?
That new cells can be produced only from the division of existing cells.
What is cell theory?
- All living things are made up of cells. 2. Cells are the basic units of structure and function in living things. 3. New cells are produced from existing cells
How do microscopes work?
use lenses to magnify the image of an object by focusing light or electrons.
What are the two lenses of a compound light microscope called?
The objective lens (located just above the specimen) and the ocular lens
Light microscopes can magnify up to how many times?
1000 times
What do electron microscopes use?
they use beams of electrons that are focused by magnetic fields
What is the molecule that carries biological information?
DNA
Cells are surrounded by a thin flexible barrier called what?
Cell membrane
What is a nucleus?
a large membrane-enclosed structure that contains genetic material in the form of DNA and controls many of the cell’s activities
What are the two broad categories that cells fall into?
Eukaryotes & Prokaryotes
Cells that enclose their DNA in nuclei?
Eukaryotes
