Question
In the Krebs cycle, how is citric acid formed?(1 point)
Responses
Pyruvic acid molecules are broken down by an acetyl group.
Pyruvic acid molecules are broken down by an acetyl group.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Enzymes combine hydrogen ions, oxygen, and electrons.
Enzymes combine hydrogen ions, oxygen, and electrons.
Carbon dioxide bonds with a chain of coenzyme A.
Carbon dioxide bonds with a chain of coenzyme A.
Responses
Pyruvic acid molecules are broken down by an acetyl group.
Pyruvic acid molecules are broken down by an acetyl group.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Enzymes combine hydrogen ions, oxygen, and electrons.
Enzymes combine hydrogen ions, oxygen, and electrons.
Carbon dioxide bonds with a chain of coenzyme A.
Carbon dioxide bonds with a chain of coenzyme A.
Answers
GPT-4o mini
In the Krebs cycle, citric acid is formed when **acetyl-CoA joins with a large molecule called oxaloacetic acid.** This reaction initiates the cycle by producing citric acid (citrate), which is then further processed through various reactions in the cycle.
e
Which molecule provides the activation energy that starts glycolysis? (Not which molecule is broken down during glycolysis)(1 point)
Responses
sugar
sugar
ATP
ATP
carbon dioxide
carbon dioxide
water
Responses
sugar
sugar
ATP
ATP
carbon dioxide
carbon dioxide
water
GPT-4o mini
The molecule that provides the activation energy that starts glycolysis is **ATP.** ATP is used in the early steps of glycolysis to phosphorylate glucose and other intermediates, which helps to drive the pathway forward.
e
During which phase of cellular respiration is carbon dioxide released?(1 point)
Responses
glycolysis
glycolysis
Kreb's cycle
Kreb's cycle
digestion
digestion
electron transport chain
Responses
glycolysis
glycolysis
Kreb's cycle
Kreb's cycle
digestion
digestion
electron transport chain
GPT-4o mini
Carbon dioxide is released during the **Kreb's cycle.** This cycle, also known as the citric acid cycle, takes place in the mitochondria and produces carbon dioxide as a byproduct as it metabolizes acetyl-CoA.
e
Which compound is a reactant in cellular respiration?(1 point)
Responses
carbon dioxide
carbon dioxide
ATP
ATP
oxygen
oxygen
water
Responses
carbon dioxide
carbon dioxide
ATP
ATP
oxygen
oxygen
water
GPT-4o mini
The compound that is a reactant in cellular respiration is **oxygen.** Oxygen is essential for aerobic respiration, where it acts as the final electron acceptor in the electron transport chain, allowing for the production of ATP.
e
How many O2 molecules are required for two glucose molecules to undergo cellular respiration?(1 point)
Responses
6
6
12
12
2
2
18
Responses
6
6
12
12
2
2
18
GPT-4o mini
For two glucose molecules to undergo cellular respiration, **12 O2 molecules** are required. This is because each glucose molecule requires 6 O2 molecules for complete oxidative phosphorylation and ATP production during cellular respiration. Therefore, for two glucose molecules, it would be \(2 \times 6 = 12\) O2 molecules.
e
Which statement is true?(1 point)
Responses
Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.
Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.
Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature by choice.
Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature by choice.
Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
Responses
Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.
Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.
Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature by choice.
Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature by choice.
Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
GPT-4o mini
The true statement is:
**Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.**
Endotherms, like mammals and birds, can maintain their body temperature through metabolic processes and can also use behaviors (like seeking shelter or adjusting clothing) to help regulate their temperature. They possess insulation, such as fur or fat, to reduce heat loss.
**Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.**
Endotherms, like mammals and birds, can maintain their body temperature through metabolic processes and can also use behaviors (like seeking shelter or adjusting clothing) to help regulate their temperature. They possess insulation, such as fur or fat, to reduce heat loss.