Biology exam: Labs
Identify one experimental variable in radish lab
Aspirin
What biomolecule is found in bread?
Carbohydrates (starch)
List two factors that increase enzyme activity
pH and temperature
What do enzymes react with?
substrates
If you view a cell under high power (100X) on a microscope and the eyepiece is 10X, how many times larger is the cell being viewed?
1000X
In what position should the stage of a microscope be when focusing on an object for the first time?
All the way down
What does polar mean?
Charges on opposite side of the molecule
What focusing knob on the microscope should never be used when using high power?
Coarse adjustment
In properties of water lab, what property of water was demonstrated by paper clips floating on water but not in water and oil?
Cohesion - water sticks to paperclip
What have active sites that fit with substrates to start chemical reactions?
Enzymes
Where should objects to be viewed under the microscope be placed?
Field of view/center of view
What does the diaphragm do?
It changes the amount of light in the microscope.
What would happen to the rate of photosynthesis if you gave plants only green light and colder temperatures?
It decreases
What would happen to the rate of photosynthesis if you gave plants more CO2 and more H2O?
It increases
What biomolecule is found in olive oil?
Lipids
What biomolecule is found in pepperoni pizza?
Proteins and carbohydrates
Identity controlled variables in the radish lab
Same amount of time, temperature, amount of seeds
In radish lab, what was the experimental group?
Seeds in aspirin and water
In radish lab, what was the control group?
Seeds in water
What do reagents do?
Test for presence of a substance
What happens when enzymes are exposed to strong acids or high temperatures?
They denature, or breakdown
What property of water was demonstrated by a pure water and salt solution compared to a water/oil and salt solution?
Water is a solvent. It dissolves better than oil.
What property of water was demonstrated using ice in water and ice in oil?
Water is less dense as a solid