Question

In the Krebs cycle, how is citric acid formed? (1 point)
Pyruvic acid molecules
• are broken down by an acetyl group.
Enzymes combine
• hydrogen ions, oxygen, and electrons.
Acetyl-CoA joins with
• a large molecule called oxaloacetic acid.
Carbon dioxide bonds
• with a chain of coenzyme A.

Answer 1

The following are steps of cellular respiration except (1 point)
O glycolysis
• the Krebs cycle
• electrolysis
electron transport chain

Answer 2

Which molecule provides the activation energy that starts glycolysis? (Not which molecule is broken down during glycolysis)
(1 point)
• АТР
• sugar
• carbon dioxide
• water

Answer 3

?

Answer 4

During which phase of cellular respiration is carbon dioxide released? (1 point)
electron transport chain
• glycolysis
• digestion
• Krebs cycle

Answer 5

Which statement is true? (1 point)
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 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.

Answer 6

Which activity uses ATP to raise body temperature? (1 point)
• shivering
• hibernating
• panting
• storing fats

Answer 7

In the Northern Hemisphere, climate scientists observe seasonal changes in carbon dioxide concentration with the highest levels measured in May and the lowest levels measured in October. Hypothesize how photosynthesis can affect these changes. Explain your answer in three to five sentences. (Remember:
1. Leaves, in the Northern Hemisphere, appear on trees in the Spring and fall from trees in the Autumn. 2. Leaves are where photosynthesis occurs. 3. How does photosynthesis effect carbon dioxide?) (4 points)

Answer 8

Plants in different environments have challenges that only they have.
For example, the growth of a plant in a rainforest (e.g., an orchid) might be more affected by different things than a plant in a desert (e.g., a succulent). In three to five
sentences, compare environmental challenges that could affect the photosynthetic process of a rainforest plant versus a desert plant. (4 points)

Answer 9

In 3 to 5 sentences, describe the relationship between a glucose molecule and the products it makes during cellular respiration. (4 points)

Answer 10

Remember the law of conservation of mass. The human body uses cellular respiration to make energy.
Using the chemical equation for cellular respiration, explain how the amounts of oxygen and carbon dioxide inhaled by the lungs is different from the amounts exhaled.
Explain your answer in 1-2 sentences. (2 points)

Answer 11

Dragonflies are flying insects. In the summer, dragonflies can be seen perched on tree branches in an obelisk pose (i.e., a handstand position with the tip of their abdomen pointing upward). In 3-5 sentences, describe how dragonflies might control their body temperature and give reasons for why they might perch in this pose. (4 points)