Flashcards in Bio - Unit 1, Chapter 2 Deck (38):
Define the Scientific Method
A logical approach to the solution of problems or unanswered question.
What does the Scientific Method consist of?
1) Recognize problem
2) Collect info
3) Make a hypothesis
4) Do an experiment
5) Observations and Data
What are the two groups a proper experiment should have?
Control group and Experimental group
What is a Control Group?
Used to compare, all variables are kept constant (the same).
What is an Experimental Group?
The test group which you change one variable.
Any factor that influences an experiment.
What are the two types of observations?
Quantitative and Qualitative
Observations that have a measurement. (number with units, eg. mass, speed, length, volume)
Observations that are descriptive, and do not have a number. Eg. colour, smell, state
A fake pill
What is using both a control and experimental group called?
A "double blind study".
What is a theory?
When something is proven to be true.
What is the Cell Theory?
2 main ideas:
1) all living things are made up of cells
2) all cells come from pre-existing cells.
What is the Theory of Evolution?
The idea that populations change over long periods of time to suit the environment. (natural selection)
What are prokaryotic cells?
Cells that do not have a nucleus (bacteria).
What are eukaryotic cells?
Cells that do have a nucleus. (Plants and Animal Cells)
What are chromosomes?
DNA, genetic information.
What does a mitochondria do?
Makes energy for the cell.
What does the nucleus do?
It's the control centre of the cell.
What does a ribosome do?
What does a cell membrane do?
Controls what enters and leaves the cell.
What do vacuoles do?
Storage sites in the cells (food, waste, etc.)
What is cytoplasm?
Liquid inside the cell.
In a plant cell, what is chloroplast?
What does a cell wall do?
Structure and support.
What is LM? (microscopes)
What is TEM? (microscopes)
Transmission Electron Microscope (shows inside structures of cells).
What is SEM?
Scanning Electron Microscope (shows surface structures of cells)
What does a light microscope do?
Focuses light onto the specimen and uses the glass lens to magnify it.
What do electron microscopes do?
Use a beam of electrons to create an image. (magnifies better than light microscopes)
Define field study
Study of an organism in their natural environment.
Define lab study
Controlled experiments in a lab
What is electrophoresis?
Used to separate molecules of a mixture using electricity. (DNA tests)
What is a Centrifuge?
A tool that separates mixtures by spinning them at high speed.
Define tissue cultures.
When large amounts of a single type of cell is grown in a lab.
What is cell fractionation used to study?
What is chromatography used to study?
The components of a mixture of gas or liquid.