CR - steps
what are the 3 main steps of aerobic cellular respiration?
1) glycolysis 2)Krebs cycle and 3) electron transport chain
What is the primary purpose of cellular respiration?
Make ATP!
What is light energy used for during the light reaction?
What are the reactants for photosynthesis?
H2O, CO2, light energy
true or false: Ms. Almond's degree is in microbiology.
with a minor in STEM Education ;)
Which step in aerobic CR requires oxygen, makes some water, and makes around 36 ATP molecules?
Electron transport chain!
What are 2 differences between ADP and ATP?
ATP - high energy, 3 phosphates
ADP - low energy, 2 phosphates
What is the energy source for the Calvin cycle?
ATP! (made during the light reaction)
What are 2 uses of glucose within the plant?
Energy (breakdown in cellular respiration)
structure (build cell walls to make stems, etc.)
True or false: only eukaryotes make ATP
false! Everything needs ATP!
What happens in glycolysis?
1) glucose is broken down into pyruvate
2) a little bit of ATP is made
happens in the cytoplasm and is anaerobic
True or false: bacteria prefer aerobic cellular respiration because it makes more ATP.
False, bacteria can't do aerobic CR because they don't have a mitochondria
Is photosynthesis aerobic or anaerobic, explain why or why not.
Anaerobic because it does not require oxygen. Oxygen is produced, but not something that is needed.
An aquatic plant is producing more and more bubbles the closer it is to a light source. Explain what's in the bubbles and why this relationship happens?
Oxygen is in the bubbles. The closer the plant is to light, the more photosynthesis it can do (photosynthesis requires light). Since photosynthesis makes oxygen, there will be more oxygen bubbles if more photosynthesis happens.
____________ is endothermic and ______________ is exothermic. Explain why.
photosynthesis is endothermic because energy is absorbed (light). CR is exothermic bc energy is made and released (ATP).
The second step in aerobic respiration that produces CO2 as a waste product
the Krebs cycle
When would our bodies switch from aerobic respiration to anaerobic respiration?
When our cells run out of oxygen. This happens when we use our energy too quickly, such as when we are exercising.
Explain what is happening during the light reaction? Include where it takes place and a byproduct that is produced
1) light energy is absorbed
2) the light energy is used to break apart water molecules
3) oxygen is released as byproduct, and a little ATP is made
4) happens in the thylakoid.
In a test tube, a plant, water, and CO2 indicator (phenol red) were added to the test tube. The tube was then wrapped in foil blocking the light. The starting color in the test tube was red. What color would we expect the test tube to be when we reveal it a few days later?
It should turn orange/yellow indicating more CO2. If light can't get in, the plant cannot do photosynthesis. Instead it will do CR which produces CO2.
Fill in the gaps in the chemical equation.
_____ + O2 --> ______ + CO2 + _______
To make ATP energy during cellular respiration!
C6H12O6 + O2 --> H2O + CO2 + ATP
Explain how the ETC works to produce ATP molecules
ETC starts with active transport of H+ across the membrane creating a strong conc. gradient. When H+ are able to diffuse through ATP Synthase, the movement of molecules and the voltage differential charge ATP synthase like a battery. This energy powers ATP synthase to make many ATP molecules by adding a 3rd phosphate to ADP molecules.
Ms. Sugrue goes on a long, grueling hike. She feels so accomplished afterwards! She also feels very sore. Explain why.
On her hike, her muscle cells used up the available oxygen. She had to keep making ATP to finish the hike, so she switched to anaerobic respiration. This process produced lactic acid which is why she is sore.
Explain what is happening during the Calvin cycle? Include the location and a product that is made.
1) CO2 absorbed through the stomata (leaf pores)
2) ATP is used to break apart CO2 molecules
3) ATP is used to build a glucose molecule
4) happens in the stroma
A plant grew 10 pounds in mass. Where did the plant get the materials to grow more plant matter?
CO2 taken in from the atmosphere and H2O taken in through the roots. These get converted to glucose during the Calvin cycle, which is used to make more plant matter.
In a closed water bottle there is water, a snail, aquatic plant, and gravel. What are the sources of carbon dioxide in the water bottle?
snail and plant (both doing cellular respiration)