Making Connections
It increase
What is diffusion?
Movement of molecules from high to low concentration.
What is used to compare DNA in this lab?
Gel electrophoresis.
What does each tool in the lab represent?
A finch's beak
What is a hypothesis?
A proposed explanation or prediction.
What variable did you measure in the lab?
Dependent variable: pulse rate
Which molecule moved into the dialysis tubing and changed the color?
Iodine
What does a matching DNA band pattern suggest?
A close evolutionary relationship
What determines which beak type survives better?
The available food source
Define independent variable.
The variable that is changed by the experimenter.
What is the purpose of having a control group in an experiment?
To compare results and see the effect of the independent variable.
Why didn’t starch leave the bag?
Its molecules are too large to pass through the membrane.
Name one type of molecular evidence used in classification.
DNA sequences or enzyme activity
This process explains why successful traits become more common.
Natural selection.
What tool is used to separate DNA fragments?
Gel electrophoresis.
Why should experiments be repeated?
To improve reliability and accuracy of results.
What test is used to detect glucose in a solution?
Benedict’s solution (after heating).
Why is it important to use both molecular and structural evidence?
To make more accurate comparisons between organisms.
What would happen if the environment suddenly changed?
The best-suited beak type might change.
Why are constants important in an experiment?
They ensure a fair test by keeping everything else the same.
Name two constants in the pulse rate experiment.
Same duration of exercise, same measuring method, same time of day, etc.
Why is osmosis important for cells?
It helps regulate water balance and maintain homeostasis
If two plants have similar enzymes and DNA, what can we conclude?
They share a recent common ancestor
Why is variation within a species important?
It allows some individuals to survive changes and pass on traits.
What’s the purpose of using indicator solutions like iodine or Benedict’s?
To detect the presence of specific substances.