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