Energy PDH and Krebs cycle (DONE) week 12

Exam #4

Which reaction do cells use to transfer energy from one molecule to another?

phosphorylation reactions

The Krebs cycle & pyruvate oxidation reactions occur in which organelle?

mitochondrial matrix

Why does each human cell contain multiple mitochondria?

mitochondria are the cells’s powerhouse

Why does each mitochondrion contain multiple copies of each pyruvate oxidation enzyme & each Krebs cycle enzyme?

to ensure the cell can produce ATP efficiently and meet energy demands

Are some B vitamins cofactors for pyruvate oxidation & Krebs cycle enzymes?

Yes, B vitamins are essential

Which two types of energy rich molecules does pyruvate oxidation produce?

NADH and Acetyl-CoA

Which energy rich product of glycolysis is the substrate for pyruvate oxidation?

Pyruvate

Which waste product molecule is generated during pyruvate oxidation?

Carbon dioxide (CO2)

Which three type of energy-rich molecules does the Krebs cycle produce?

NADH, FADH2, and ATP (or GTP)

Which catabolic process produces the Acetyl CoA molecules that enter the Krebs cycle?

Pyruvate oxidation

Is the energy stored in FADH2 & NADN molecules used to make ATP in mitochondria when O2 is Available?

Yes, when oxygen (O2) is available energy in NADH and FADH2 is used to make ATP through oxidative phosphorylation

Are some GTP molecules converted to ATP molecules?

Yes, GTP molecules produced in the Krebs cycle are converted to ATP

How do the CO2 molecules produced as waste products during pyruvate oxidation & the Krebs cycle exit your body?

CO2 from pyruvate oxidation and Krebs cycle is transported in the blood to lungs and exhaled

Do the Glycolysis, private oxidation, and the Krebs cycle redox reaction transfer the energy in food molecules to NAD+ to make NADH?

Yes, NAD+ acts as a Electron carrier and energy from food molecules is captured in high-energy electrons of NADH

The Krebs cycle transfers some energy in food molecules to FAD to make which energy rich molecules?

Krebs cycle ➡ FAD + electrons ➡ FADH2

The Krebs cycle transfer some energy in food molecules to GDP to make which energy rich molecule?

Krebs cycle ➡ GDP + energy ➡ GTP