Scientific Method
Characteristics of Life
Cells
Diffusion
100
What is the term that is defined as making a prediction based on an observation?
Hypothesis
100
What is the smallest unit of life?
Cell
100
What is the control center of the cell?
Nucleus
100
What cell organelle controls what comes in and out of the cell?
Cell membrane
200
What variable is manipulated by the scientist?
Dependent Variable
200
What is the name of the molecule that contains our genetic material?
DNA
200
What organelle converts sugar into energy for the cell to use?
Mitochondria
200
Fill in the blanks: Things tend to move from ________ concentration to _____ concentration?
High; Low
300
What are the three kinds of variables used in an experiment?
Dependent, Independent, Control
300
What is the word for an organism that changes over time?
Evolution
300
What is the structure that makes proteins?
Ribosomes
300
How is osmosis different from diffusion?
Osmosis is only the movement of water. Diffusion is the movement of anything, but water.
400
Why is it important to run the same test multiple times during an experiment.
So the results are repeatable to validate the experiment so that what you discovered/found was not a fluke or coincidence.
400
What is the term to describe an organism that maintains a stable internal environment?
Homeostasis
400
What are the two structures that can be found in plant cells and not in animal cells? What are the functions of these organelles?
Cell Wall- to allow certain molecules in and out of the cell Chloroplasts- To convert light energy into sugar
400
Say you have 10 salad dressing molecules and 4 water molecules on the right. You have 2 salad dressing molecules and 8 water molecules on the left. Both substance are permeable and can pass through the cell membrane. What molecules are going to move in which direction? How many molecules of each do you expect to be on each side?
Salad Dressing moves to the left, Water moves to the right. There should be 6 of each on each side of the membrane.
500
If your experimental results do not match your results, it it a bad thing to happen? Why or why not?
No, because we can go back and adjust our experiment or use the conclusions to develop a new experiment
500
What are the two types of Reproduction? How are these two types of reproduction different from one another?
Asexual- One parent, Both cells are identical Sexual- Two parents, Offspring contains genetic information from both parents
500
What are two similarities between prokayotic cells and eukaryotic cells? What are two differences between prokaryotic cells and eukaryotic cells?
Similarities- Both have DNA, Ribosomes, cytoplasm, Cell Membrane Differences- Eukaryotic has a nucleus, prokaryotic doesn't have a nucleus. Eukaryotic has membrane bound organelles (ex. mitochondria), prokaryotic cells don't. Eukaryotic large and complex, prokaryotic is small and simple.
500
What are the two parts that make up the cell membrane?
Hydrophylic Head, Hydrophobic Tails
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