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Biology Sem 2 Midterm Review
Biology Sem 2 Midterm Review
36
Science
9th Grade
09/29/2014

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Term
Hypothesis
Definition
A testable explanation that uses the form: If (independent variable), then (dependent variable).
Term
Independent Variable
Definition
The variable that is changed. It causes something to happen. Also called manipulated variable.
Term
Dependent Variable
Definition
The result in the experiment. Also called the responding variable.
Term
Control Group
Definition
The group that does not recieve the treatment or the independent variable. This is used for comparison.
Term
Controlled variables
Definition
Not to be confused with the control group. These are all the other variables in the experiment that must be kept the same so that these do not impact the results.
Term
Problem
Definition
A testable question in an experiment
Term
Results
Definition
The data and observations made in an experiment
Term
Conclusions
Definition
This is the explanation of the experiment. It refers back to the hypothesis as well as gives details about experimental error and provides reasoning about the meaning of the results.
Term
Experimental Error
Definition
Sources or components in the experiment that may have affected the accuracy of the results
Term
Where is the independent variable found on a graph?
Definition
x - axis
Term
Where is the dependent variable found on a graph?
Definition
y - axis
Term
examples of lipids
Definition
fats, oils,
Term
what are the structural components of a lipid?
Definition
fatty acid chains and glycerol
Term
examples of proteins
Definition
meats, eggs
Term
what are the structural components of proteins?
Definition
amino acids chained together then folded into 3D shapes
Term
examples of carbohydrates
Definition
breads, pasta, rice, grains
Term
what are the structural components of carbohydrates
Definition
simple sugars chained together
Term
what is starch?
Definition
a complex made of a chain of sugars
Term
macromolecule
Definition
a large molecule such a protein, starch, or lipid
Term
What does DRY MIX stand for?
Definition
D = Dependent variable
R = Responding variable
Y = Y-axis

M = Manipulated variable
I = Independent variable
X = X-axis
Term
Butter and olive oil are examples of ....
Definition
lipids
Term
cereal is an example of ....
Definition
carbohydrate
Term
fish is an example of ....
Definition
protein
Term
What are the three elements that all proteins, carbohydrates, and lipids contain?
Definition
Carbon, hydrogen, and oxygen
Term
Which type of macromolecule is used by your body for quick energy?
Definition
carbohydrates
Term
What are nutrients?
Definition
These are generally large molecules such as proteins, carbohydrates, and lipids that are used by our body for purposes such as to build structures or provide energy.
Term
Organic molecules must contain
Definition
carbon - and can also have hydrogen, oxygen and some other elements.
Term
What is the scientific term that means an organism is in its normal, healthy state?
Definition
Homeostasis
Term
Membranes around cells are semi-permeable. What does that mean?
Definition
Semi-permeable means that the membrane lets some materials pass but not every kind of material.
Term
What does impermeable mean?
Definition
This is when nothing is allowed to pass.
Term
What is meant by the term hypertonic?
Definition
This means that this is a solution with many dissolved particles such as in salty water
Term
What is meant by the term hypotonic?
Definition
This means that this is a solution with few or no dissolved particles such as in tap water
Term
What is meant by the term isotonic?
Definition
This means that this is a solution with the same concentration as that the cell.
Term
What happens if you place a cell in hypertonic solution?
Definition
It will shrivel - lose water.
Term
What happens if you place a cell in hypotonic solution?
Definition
It will swell up and maybe even lyse (burst open).
Term
What happens if you place a cell in isotonic solution?
Definition
There will be no net movement of water in or out - will remain about the same.
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