Bio Exam Flashcards
How did Robert hooke contribute to cellular biology?
Observed thin slices of cork which appeared as small boxes or rooms, which he named cells
What are the advantages to using an electron microscope over a compound light microscope?
- light works better
- magnification goes up 2000x rather than 1000x
What did Antonio van Leeuwenhoek observe under the microscope?
- Single celled organisms
- Nucleus
What was the experiment conducted by Francesco Redi that provided evidence against spontaneous generation?
- no lid became infested with maggots
- lid did not become infested
What expirement did Louis pasteur disprove spontaneous generation?
- swan neck flask: Infected
- regular flask: Non-infected
What did schledian make for a development of cell theory
All pants are composed of cells
What did schwann make a development for cell theory
All organisms are made of cells
What are the three components to cell theory?
- All organisms are made of cells
- The cell is the smallest unit of life
- All cells are made from other cells
What are tye three factors that affect microscope Image quality?
- Magnification
- Contrast
- Resolution
Why is a cell considered to be an open system
It exchanges bothe matter and energy
Explain why phospholipids will spontaneously form a bilayer when in water
Water repels the tail end of the phospholipid so they automatically arrange into layers two molecules thick
What are thefpur components of the partical model of matter
- All matter is made of particals
-Particals r always n random motion - partials are attracted to eachother
- matter is empty space
What is diffusion?
The movement of molecules from an area of high concentration to an area of low concentration
What is osmosis?
The diffusion of water molecules down a concentrated gradient
What is facilitated diffusion?
The use of transport proteins to and, or facilitate the diffusion of particals across the membrane
What is active transport?
The movement of particals against a concentration gradient. Requires the input of energy
What is endocytosis
Energy entering
What is exotosis
Energy exiting
How does dialysis make use of semipermeable membranes?
- allows waste particles and excess salts to flow out of the blood through diffusion
- excess water will move across membrane
- semi-permable membrane retains larger blood cells and protiens
