Chapter 7-PowerPoint Lectures Flashcards
How much do you multiply fat by to get calories?
9
How much do you multiply sugar by to get calories?
4
How much do you multiply protein by to get calories?
4
What is included in calories?
protein, fat, and sugar
Plants are autotrophs or heterotrophs?
autotrophs
How do autotrophs make food?
through sunlight and convert radiant energy into chemical energy
How do heterotrophs make food?
live off energy produced by autotrophs—-extract energy vis digestion and catabolism
What is cellular resperiaiton?
series of metabolic reactions that breakdown food and produce ATP
What are the two types of cellular respiration?
aerobic and anaerobic
Does aerobic respiration use oxygen?
yes
Which form of respiration uses oxygen as a reactant?
aerobic respiration
What is the goal of respiration?
produce ATP
What type of reactions does respiration use?
redox reactions
When is energy released in respiration? in what form?
oxidation reaction in the form of electrons
What type of respiration is it when oxygen is the final electron acceptor?
aerobic reaction
What type of respiration is it when oxygen is the final electron acceptor?
aerobic reaction
What is the empirical formula for glucose?
C6 H12 O6
How many ATP is made from one molecule of glucose?
32
Why can’t glucose reaction happen in one step?
delta G is really large, it would cause an explosion if that much free energy was released at once
What are the properties of electron carriers?
soluble, membrane-bound, move within membrane
Can all carriers be easily oxidized and reduced?
yes
What does NAD+ become when it accepts an electron?
NADH
What is dehydrogenase?
an enzyme that facilitates the transfer of electrons from a fuel molecule to an electron carrier
What is the structure of NAD+?
adenine, 2 ribose, 2 phosphates, nicotinamide
What three polymers of glucose ?
glycogen, cellulose, starch
What are the 4 stages of oxidation of glucose?
glycolysis, pyruvate oxidation, kreb’s cycle, electron transport chain and chemiosmosis (ATP production)
Where does glycolysis occur?
cytosol
Is there a loss of carbon in glycolysis?
no
What is used instead of oxygen in anaerobic respiration?
sulfate or nitrate
What is used instead of oxygen in anaerobic respiration?
sulfate or nitrate
What is an example of an electron carrier?
NAD+
What are electrons carried by and where are they carried to?
they are transported by electron carriers to the electron transport chain
Where is electron energy converted to ATP at?
electron transport chain
In aerobic respiration what is the final electron acceptor?
oxygen
In anaerobic respiration what is the final electron acceptor?
inorganic molecule other than oxygen
In fermentation what is the final electron acceptor?
organic molecule
In redox reactions where do electrons release some of their energy?
as they pass from a donor molecule to an acceptor molecule
What is the equation for ATP synthesis from glucose?
1 glucose + 6 O2 + 32 ADP + 32 Pi —> 6 H20 + 6CO2 + 32 ATP
What is the delta G for aerobic respiration of glucose?
-696 kcal/mol of glucose
Do all electron carriers carry just electrons?
No, some carry just electrons while some carry both electrons and protons
What is the name of NAD+?
nicotinamide adenine dinucleotide
In cellular respiration how many electron and protons are transferred to NAD+? and by what? What does this from?
dehydrogenases transfer 2 electrons and 1 proton which created
NADH
Where does pyruvate oxidation occur?
mitochondrial matrix
Where does kreb’s cycle occur?
mitochondrial matrix
Where does electron transport chain and ATP synthase enzyme occur?
inner mitochondrial membrane
In glycolysis what is the 6-carbon molecule of glucose broken down into?
enzymes break it down into two 3-carbon molecules of pyruvate
What is substrate-level phosphorylation?
enzyme-catalyzed reaction that transfers a phosphate group from a substrate to ADP
What step does substrate-level phosphorylation occur?
glycolysis
What occurs in the pyruvate oxidation and kreb’s cycle?
Enzymes convert the 3-carbon pyruvate into a 2-carbon acetyl group, which enters the citric acid cycle and is completely oxidized to carbon dioxide
Is some ATP synthesized during the citric acid cycle?
yes
What causes free energy to be released in Oxidative phosphorylation – electron transport chain and chemiosmosis?
proton gradient created by chemisomosis
What occurs in Oxidative phosphorylation – electron transport chain and chemiosmosis?
electron are delivered to oxygen via electron transport chain
What uses the proton gradient as an energy source to make ATP?
ATP synthase
What are the two mechanisms for ATP synthesis?
substrate-level phosphorylation and oxidative phosphorylation
What does the donor molecule donate, and donate to, what does it become? During substrate-level phosphorylation
donates phosphate to ADP to create ATP
What enzyme is involved in oxidative phosphorylation?
ATP synthase
Where does the energy come from in oxidative phosphorylation?
proton gradient from the oxidation of glucose
Why is it called oxidative phosphorylation?
electrons from the proton gradient are donated to oxygen
Where does glycolysis get its energy from?
2 ATP
How many ATP are created from glycosisu?
4 ATP
What is the net gain of ATP in glycolysis?
2 ATP
Equation for glycolysis?
Glucose + 2 ADP + 2 Pi + 2 NAD+ + 4 e− + 4
H+ → 2 pyruvate + 2 ATP + 2 NADH + 2 H+ +
2 H2O
What does NAD+ become in glycolysis?
NADH
How many electrons and protons does NADH carry in glycolysis?
2 electrons and one proton
In the first step of glycolysis what is the enzyme involved?
hexokinase
What happens in the first step of glycolysis?
Glucose receives a phosphate from ATP, producing glucose-6-phosphate
What type of reaction occurs in the first step of glycolysis?
Phosphorylation reaction
What happens in the second step of glycolysis?
Glucose -6-Phosphate is rearranged to Fructose – 6- Phosphate
In the second step of glycolysis what is the enzyme involved?
Phospho gluco-isomerase
What type of reaction occurs in the second step of glycolysis?
Isomerization reaction
What happens in the third step of glycolysis?
Another phosphate group from ATP is attached to fructose-6-phosphate,
producing Fructose -1,6,bisphosphate
In the third step of glycolysis what is the enzyme involved?
Phosphofructokinase
What type of reaction occurs in the third step of glycolysis?
Phosphorylation reaction
What happens in the 4 step of glycolysis?
Fructose-1,6-bisphosphate is split into glyceraldehyde-3-phosphate (G3P) and dihydroxyacetone phosphate (DAP)
In the 4 step of glycolysis what is the enzyme involved?
Aldolase
What type of reaction occurs in the 4 step of glycolysis?
HYDROLYSIS or CLEAVAGE
What happens in the 5 step of glycolysis?
The DAP produced in reaction 4 is converted into G3P, giving a total of two of these molecules per molecule of glucose.
In the 5 step of glycolysis what is the enzyme involved?
Triose phosphate isomerase
What type of reaction occurs in the 5 step of glycolysis?
Isomerization
What happens in the 6 step of glycolysis?
Two electrons and two protons are removed from G3P. Some of the energy released in this reaction is trapped by the addition of an inorganic phosphate group from the cytosol
(not derived from ATP). The electrons are accepted by NAD+, along with one of the protons.
The other proton is released to the cytosol.
In the 6 step of glycolysis what is the enzyme involved?
Glyceraldehyde-3-phosphate dehydrogenase or Triose phosphate dehydrogenase
What type of reaction occurs in the 6 step of glycolysis?
Dehydrogenation reaction or redox reaction
What happens in the 7 step of glycolysis?
One of the two phosphate groups of 1,3-bisphosphoglycerate is transferred to ADP to produce ATP (substrate-level phosphorylation reaction).
In the 7 step of glycolysis what is the enzyme involved?
Phosphoglycerate kinase
What type of reaction occurs in the 7 step of glycolysis?
: Substrate level Phosphorylation reaction
What happens in the 8 step of glycolysis?
3-Phosphoglycerate is rearranged, shifting the phosphate group from the 3rd carbon to
the2nd carbon to produce 2-phosphoglycerate
In the 8 step of glycolysis what is the enzyme involved?
Phospho-glyceromutase
What type of reaction occurs in the 8 step of glycolysis?
Mutase reaction—shifting of a chemical group to another within same molecule