CP 5 Cellular respiration

Question 1

what is cellular respiration

Answer 1

• Metabolic reactions breaks down carbs, lipids, and proteins to produce ATP

Question 2

what is a fuel molecule

Answer 2

• Any molecs that have high C-C or C-H bonds has a high energy potential (high in free energy)

Question 3

which releases energy faster and why, Glucose and fats

Answer 3

Glucose releases faster, bonds r weaker

Question 4

TF if there is a transfer of an electron there is also a transfer of a H atom

Answer 4

T

Question 5

what is a dehydrogenase enzyme

Answer 5

○ Enzymes that transfer electrons from “food” to energy shuttles

Question 6

what does the coenzyme do for NAD+

Answer 6

turns NAD+ –> NADH

Question 7

what are the 3 stages of cellular respiration

Answer 7

• Glycolysis
• Pyruvate oxidation and the citric acid cycle
• Oxidative phosphorylation

Question 8

what happens in Glycolysis

Answer 8

Glucose and other fuel molecs are turned into 3 carbon Pyruvates, ATP and NADH

Question 9

what happens in Pyruvate oxidation

Answer 9

• pyruvate enters mitochondria
• pyruvate molecs converted into molec (acetyl-CoA)
• this process releases 1 CO2 and produces 1 NADH
• The acetyl-CoA then enters the Citric Acid Cycle as an energized starter molecule.

Question 10

what happens in the citric acid cycle (krebs cycle)

Answer 10

• acetyl-CoA combines with 4-carbon molec already present in the cycle, creating 6-carbon molec
• The cycle breaks down this 6-carbon molec back into a 4-carbon molecule, releasing CO2, ATP, NADH, and FADH2
• NADH+FADH2 carry high-energy electrons to the electron transport chain, where lots of ATP is produced.
• The four-carbon molecule is regenerated to start the cycle over again with a new acetyl-CoA molecule.

Question 11

where does pyruvate oxidation occur

Answer 11

Mitochondria