2.26 Glycolysis

Where does glycolysis take place?

• Mitochondrion

• Cytosol

• Mitochondrial matrix

• Cristae

Answer explanation

Glycolysis occurs in the cytosol, the fluid part of the cell outside the mitochondria. This process breaks down glucose into pyruvate, generating energy in the form of ATP.

What reactant goes into glycolysis?

• pyruvate

• oxygen

• glucose

• starch

Answer explanation

Glycolysis is the metabolic pathway that breaks down glucose to produce energy. Therefore, the correct reactant that enters glycolysis is glucose, not pyruvate, oxygen, or starch.

What net products are being made from glycolysis?

• ATP, NADP, pyruvate

• pyruvate, ADP, NAD+

• ATP, pyruvate

• CO2, H2O, ATP

Answer explanation

Glycolysis produces 2 ATP and 2 NADH, along with 2 pyruvate molecules. The correct answer choice includes ATP and pyruvate, but NADP is not produced in glycolysis; instead, NAD+ is used. Thus, the correct answer is ATP, pyruvate.

After NADH is created during glycolysis, where does it go?

• to the Krebs Cycle

• to the Electron Transport Chain

• Out of the cell

• to your mom's house

Answer explanation

After NADH is produced in glycolysis, it is transported to the Electron Transport Chain, where it donates electrons to help generate ATP through oxidative phosphorylation.

What is the ATP generated during glycolysis used for?

• to fuel cell processes

• to pay for the Krebs cycle

• to make proteins

• to replicate DNA

Answer explanation

The ATP generated during glycolysis is primarily used to fuel cell processes, providing the energy necessary for various cellular functions and activities.

Tags

NGSS.HS-LS1-7

Which is a product of glycolysis?

• 2 molecules of pyruvic acid

• 1 molecule of glucose

• NAD+

• oxygen

Answer explanation

Glycolysis breaks down one molecule of glucose into two molecules of pyruvic acid, making pyruvic acid a direct product of this metabolic pathway. The other options are not products of glycolysis.

Tags

NGSS.HS-LS1-7

How many ATP molecules are synthesized from 4 ADP molecules?

• 2

• 4

• 6

• 1

Answer explanation

Each ADP can be converted to ATP through phosphorylation. Therefore, 4 ADP molecules can yield 4 ATP molecules, making the correct answer 4.

Tags

NGSS.HS-LS1-7

Where does the pyruvic acid produced by glycolysis go next?

• the Calvin Cycle

• the electron transport chain

• the Krebs Cycle

• back through the glycolysis process

Answer explanation

The pyruvic acid produced by glycolysis is converted into acetyl-CoA and enters the Krebs Cycle (also known as the citric acid cycle) for further energy production, making this the correct next step.

Glycolysis is the second stage of cellular respiration.

• True

• False

Answer explanation

Glycolysis is actually the first stage of cellular respiration, where glucose is broken down into pyruvate. The second stage is the Krebs cycle. Therefore, the statement is false.

Glycolysis requires oxygen

• True

• False

Answer explanation

Glycolysis is an anaerobic process, meaning it does not require oxygen to occur. It can take place in both aerobic and anaerobic conditions, which makes the correct answer 'False'.

Tags

NGSS.HS-LS2-3