Photosynthesis

Which of the following characteristics would make an ideal green buffer? (Multiple choice)

High absorbance of red and blue; low absorbance of green

What is true about how a blue shirt is interacting with light? (Multiple Choice)

The blue shirt is absorbing all wavelengths of light except blue, which is being reflected

Which of the following are true about hypotheses? (Select all that apply)

They are an attempt to explain our observations They must include a mechanism (a 'because' statement)

Which of the following are true about observations? (Select all that apply)

They can be anything we notice using our 5 senses They can be something we measure using a lab tool They can be products of our analytical mind

Which of the following are true about predictions? (Select all that apply)

They relate to a specific experiment we want to do They are if/then statements describing the possible outcomes of the experiment There needs to be a prediction for if we support and if we refute our hypothesis

Last week, how did we substantiate the claim that photosynthesis (the light reactions) take water as an input and give off oxygen gas and energized electrons as an output? (Multiple Choice)

We indirectly demonstrated this by observing deoxygenated leaf discs float in buffer

What is the difference between light being reflected and light being transmitted? (Multiple Choice)

When light is reflected, it is bouncing off of a molecule (typically a solid, opaque object), but when light is transmitted it is passing through a substance (typically a transparent liquid/object)

Which of the following are examples where light is being emitted? (Select all that apply)

A computer screen is emitting light Electrons moving back down to their ground state after being excited emits light The sun is emitting light

In our discussion last week, we talked about the fact that when electrons are excited, they then return to their ground state by emitting photons. This doesn't always happen when chlorophyll electrons are excited - what happens to them instead? (Multiple Choice)

After the electrons in chlorophyll get excited, they are transferred to an electron carrier and move through the electron transport chain

What is the purpose of a control? (Multiple choice)

Controls are there to help verify assumptions and make sure no other factors are affecting your results

What types of controls can you have? (Select all that apply)

Controls that are conditions within your experiment; i.e., volume of buffer, number of leaf discs, etc. Controls that are there in addition to your experimental conditions; i.e., having more beakers with leaf discs Positive controls that provide a condition where you expect to see something happen; i.e., a condition where leaf discs should float Negative controls that provide a condition where you expect nothing to happen; i.e., a condition where leaf discs should not float

If you have a GREEN buffer, what wavelength(s) of light are getting through to the leaf discs? (Select all that apply)

Green

The next few questions will cover information from the "Lab 8 - Colors of Light and Waste Products of Photosynthesis" reading from the Lab Manual. What hypothesis is being tested this week? (Multiple Choice)

Green wavelengths of light are not as efficient in driving for photosynthesis as red or blue wavelengths of light

Why is oxygen produced by plants? (Multiple Choice)

It is produced as a byproduct from splitting water, which is done to replenish the electrons in chlorophyll

What products are made in the Light Dependent reactions of photosynthesis (the Electron Transport Chain)? (Select all that apply)

NADPH O2

If we have a dye that appears red, what wavelengths of light are being filtered out? (Select all that apply)

Orange Yellow Green Blue

If you have a GREEN buffer, what wavelengths of light are NOT getting through to the leaf discs? (Select all that apply)

Red Orange Yellow Blue

What happens when light is absorbed by a molecule? (Multiple Choice)

The electrons are excited to a higher energy state and return to ground state by emitting photons that total the same energy that was put in