1~ What is the original source of energy in the food you eat?(1 point)

sugar
plants*
photosynthesis
sun

2~ Why are leaves red in the fall?(1 point)

Chlorophyll breaks down because there's less sunlight
Mitochondria breaks down because there's less sunlight.
Chlorophyll reflects green light in the fall.*
Chlorophyll absorbs red in the fall, rather than green.

3~ Which statement is true?(1 point)

The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.*

The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.

The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.

The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.

4~ The original energy for photosynthesis to begin comes from:(1 point)

carbon dioxide molecules
light
water molecules
ATP *

5~ Which equation best models cellular respiration?(1 point)

C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy*

C6H12O6 + 6O2 + 6CO2 → 6H2O + Energy

6H2O + 6CO2 + Energy → C6H12O6 + 6O2

6H2O + 6CO2 → C6H12O6 + 6O2 + Energy

6~ Lactic acid fermentation can be modeled by which equation?(1 point)

Lactic acid + NADH → Pyruvic acid + NAD+

Pyruvic acid + NADH → Lactic acid + NAD+

Pyruvic acid + NAD+ → Lactic acid + NADH *

Lactic acid + NADH → Pyruvic acid NADH

7~ In the Krebs cycle, how is citric acid formed?(1 point)

Acetyl-CoA joins with a large molecule called oxaloacetic acid.*

Carbon dioxide bonds with a chain of coenzyme A.

Enzymes combine hydrogen ions, oxygen, and electrons.

Pyruvic acid molecules are broken down by an acetyl group.

8~ Which macromolecule provides the energy that starts glycolysis?(1 point)

ATP

sugar*

water

carbon dioxide

9~ During which phase of cellular respiration is carbon dioxide released?(1 point)

glycolysis

digestion

Krebs cycle*

electron transport chain

10~ Which compound is a reactant in cellular respiration?(1 point)

oxygen

ATP

carbon dioxide *

water

11~ How many O2 molecules are required for two glucose molecules to undergo cellular respiration?(1 point)

2

12

18

6*

12~Which statement is true?(1 point)

Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.

Endotherms can insulate (stop heat loss from) their bodies but 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 cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.*

13~ Which activity uses ATP to raise body temperature?(1 point)

storing fats

panting

hibernating

shivering*
14~ How can Gram staining be used to determine how bacteria respond to their environments?(1 point)

Gram staining helps scientists visualize bacterial antibiotic resistance.*

Gram staining helps scientists visualize the thickness of bacterial cell walls.

Gram staining helps scientists visualize the composition of bacterial cell membranes.

Gram staining helps scientists visualize bacterial motility.

15~ Which statement is true?(1 point)

Most protists can respire with small amounts of oxygen.

Most protists only respire without oxygen.

Most protists only respire with oxygen.*

Most protists can respire with and without oxygen at will.

Pls help ∵

None of this answer are correct , I tried and it failed me.

Then what r the answers 🙄😒

Sure! I'll be happy to help. What do you need assistance with?

Sure, I'd be happy to help you! Let's go through each question and find the correct answers together.

1. The original source of energy in the food you eat is plants. This is because plants undergo photosynthesis to convert sunlight into energy in the form of sugar, which is then consumed by organisms.

2. Leaves turn red in the fall because chlorophyll breaks down due to less sunlight. Chlorophyll is responsible for the green color in leaves, and when it breaks down, other pigments such as anthocyanins (which reflect red) become visible.

3. The statement that is true is "The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma." The Calvin cycle is the second step of photosynthesis and occurs in the stroma of chloroplasts.

4. The original energy for photosynthesis to begin comes from light. Light energy is captured by chlorophyll in plant cells and is used to power the process of photosynthesis.

5. The equation that best models cellular respiration is "C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy." This equation represents the breakdown of glucose and the release of energy in the form of ATP, with the production of water and carbon dioxide as byproducts.

6. Lactic acid fermentation can be modeled by the equation "Pyruvic acid + NAD+ → Lactic acid + NADH." In lactic acid fermentation, pyruvic acid is converted into lactic acid by the enzyme lactate dehydrogenase.

7. Citric acid is formed in the Krebs cycle when Acetyl-CoA joins with a large molecule called oxaloacetic acid. This reaction forms citric acid, which is a key intermediate in the Krebs cycle.

8. The macromolecule that provides the energy to start glycolysis is sugar. The process of glycolysis breaks down glucose (sugar) into pyruvate molecules, producing energy in the form of ATP.

9. Carbon dioxide is released during the Krebs cycle, so the correct answer is "Krebs cycle." The Krebs cycle is a series of chemical reactions that occur in the mitochondria and release carbon dioxide as a waste product.

10. The compound that is a reactant in cellular respiration is oxygen. Oxygen is required as the final electron acceptor in the electron transport chain, which is the last stage of cellular respiration.

11. Two glucose molecules require 6 O2 molecules to undergo cellular respiration. This is because each glucose molecule is broken down into two pyruvate molecules, which then enter the Krebs cycle and produce carbon dioxide and energy.

12. The correct statement is "Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily." Endotherms are warm-blooded animals that can internally regulate their body temperature but cannot completely stop heat loss.

13. Shivering uses ATP to raise body temperature. Shivering is a mechanism where muscles contract rapidly to generate heat and increase body temperature. This process requires ATP as a source of energy.

14. Gram staining can be used to visualize bacterial antibiotic resistance. Gram staining is a technique that helps classify bacteria based on the structure of their cell walls. It helps identify whether bacteria are Gram-positive (susceptible to antibiotics) or Gram-negative (resistant to antibiotics).

15. The statement that is true is "Most protists only respire with oxygen." Respiration in protists (single-celled eukaryotic organisms) typically involves using oxygen as an electron acceptor for the breakdown of glucose to produce energy in the form of ATP.

I hope this helps! Let me know if you have any more questions.