Role of ATP and Plant Pigments

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Questions and Answers

What is the primary role of ATP in cells?

  • To store genetic information
  • To facilitate transport of nutrients across cell membranes
  • To provide short-term energy storage and transport (correct)
  • To act as a long-term energy source

Which of the following components is NOT part of an ATP molecule?

  • Cellulose (correct)
  • Adenine
  • Triphosphate groups
  • Ribose

What process do organisms use to obtain energy from organic compounds?

  • Transpiration
  • Cell respiration (correct)
  • Photosynthesis
  • Fermentation

What happens to energy during a coupled reaction process?

<p>Energy is utilized to synthesize complex molecules (B)</p> Signup and view all the answers

Why is chlorophyll important in plants?

<p>It absorbs sunlight for energy (B)</p> Signup and view all the answers

How does ATP hydrolysis primarily contribute to cellular functions?

<p>By providing energy for cellular work (B)</p> Signup and view all the answers

Which cellular process does NOT typically require energy?

<p>Diffusion (A)</p> Signup and view all the answers

What type of energy storage does ATP provide?

<p>Short-term storage (C)</p> Signup and view all the answers

What happens to the bond between the phosphate groups during hydrolysis of ATP?

<p>The bond is broken, releasing energy. (D)</p> Signup and view all the answers

Which molecule is formed when ATP is hydrolyzed?

<p>Adenosine Diphosphate (D)</p> Signup and view all the answers

How does the ATP-ADP cycle relate to energy use in cells?

<p>ADP is converted to ATP through a process consuming energy. (D)</p> Signup and view all the answers

What is the term for the transfer of energy from one chemical reaction to another?

<p>Energy coupling (A)</p> Signup and view all the answers

What effect does the hydrolysis of ATP have on surrounding molecules?

<p>It excites nearby molecules, generating heat. (A)</p> Signup and view all the answers

What represents a 'rechargeable battery' in the context of ATP and ADP?

<p>ATP is the charged battery, ready to release energy. (C)</p> Signup and view all the answers

What is the primary role of carotenoids in photosynthesis?

<p>They absorb light and transfer energy to chlorophyll a. (B)</p> Signup and view all the answers

What occurs during the ATP regeneration reaction?

<p>ADP binds with a phosphate group using energy to form ATP. (A)</p> Signup and view all the answers

Which pigment is responsible for protecting plant cells from excessive sunlight?

<p>Anthocyanins (C)</p> Signup and view all the answers

In what color range do xanthophylls typically fall?

<p>Yellow and yellow-orange (D)</p> Signup and view all the answers

What happens when ATP is broken down?

<p>Energy is released and ADP is formed. (A)</p> Signup and view all the answers

Where are photosynthetic pigments located within plant cells?

<p>In the mesophyll cells (C)</p> Signup and view all the answers

What color do xanthophylls contribute to leaves during the fall?

<p>Yellow (D)</p> Signup and view all the answers

Which of the following statements about anthocyanins is true?

<p>They may appear red, purple, or blue. (A)</p> Signup and view all the answers

What is the significance of chlorophyll a in photosynthesis?

<p>It is the main pigment responsible for capturing sunlight. (B)</p> Signup and view all the answers

What is the primary color of light that chlorophyll reflects?

<p>Green (B)</p> Signup and view all the answers

Which pigment primarily absorbs violet/blue and red light for photosynthesis?

<p>Chlorophyll a (A)</p> Signup and view all the answers

What is the function of carotenoids and xanthophylls in relation to chlorophyll a?

<p>They harvest sunlight and pass energy to chlorophyll a. (A)</p> Signup and view all the answers

What happens to the visibility of accessory pigments when chlorophyll levels are high in leaves?

<p>They are masked (C)</p> Signup and view all the answers

What characterizes an exergonic reaction?

<p>It proceeds with a net release of free energy. (C)</p> Signup and view all the answers

How does energy coupling relate to ATP?

<p>It links energetically favorable reactions to unfavorable ones, like ATP hydrolysis and ATP regeneration. (C)</p> Signup and view all the answers

Which of the following pigments helps absorb light wavelengths chlorophyll cannot effectively absorb?

<p>Chlorophyll b (A), Xanthophylls (B)</p> Signup and view all the answers

Which pigment is responsible for the yellowish-green appearance of certain leaves?

<p>Chlorophyll b (C)</p> Signup and view all the answers

What happens to glucose during the energy coupling process creating sucrose?

<p>It forms a phosphorylated intermediate that is unstable. (C)</p> Signup and view all the answers

The visible light spectrum ranges from which color with the longest wavelength?

<p>Red (A)</p> Signup and view all the answers

In what form of reaction is energy absorbed from the surroundings?

<p>Endergonic reaction. (D)</p> Signup and view all the answers

What pigment is responsible for colors observed in autumn leaves?

<p>Carotenoids (A)</p> Signup and view all the answers

Why is chlorophyll important in photosynthesis?

<p>It absorbs sunlight to synthesize carbohydrates. (C)</p> Signup and view all the answers

What is the result when glucose is phosphorylated by ATP?

<p>It results in an unstable glucose-P intermediate. (B)</p> Signup and view all the answers

What color does a pigment appear if it absorbs all colors of visible light?

<p>Black (A)</p> Signup and view all the answers

What role do pigments play in photosynthesis?

<p>They absorb light energy for the synthesis of organic molecules. (C)</p> Signup and view all the answers

The reaction forming sucrose from glucose and fructose involves which of the following?

<p>A series of reactions including phosphorylation. (A)</p> Signup and view all the answers

Flashcards

ATP

An organic molecule used for short-term energy storage and transfer in cells. It's composed of adenine, ribose, and three phosphate groups.

Energy coupling

The process where energy released from one reaction is used to power another.

ATP hydrolysis

Breaking down ATP to release energy, by removing a phosphate group.

Cellular activities needing energy

Examples include: active transport, protein synthesis, and cell division

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Plant pigments

Substances in plants that absorb light energy, such as chlorophyll, which helps in photosynthesis

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Chlorophyll

A green pigment found in plants that absorbs light energy for photosynthesis.

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Energy Storage

Storing energy for later use in the form of chemical bonds.

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Essential Life Processes

Activities necessary to keep an organism alive, like growth, movement and reproduction, which require energy.

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Exergonic reaction

A chemical reaction that releases free energy.

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Endergonic reaction

A chemical reaction that absorbs free energy from its surroundings.

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Phosphorylation

The addition of a phosphate group to a molecule.

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Pigment

A substance that absorbs visible light.

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Photosynthesis

The process by which plants convert light energy into chemical energy in the form of glucose.

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ATP structure

ATP consists of an adenosine molecule with three phosphate groups.

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ATP-ADP cycle

ATP is converted to ADP when energy is used and back to ATP when energy is stored.

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ADP regeneration

Reforming ATP from ADP using energy and phosphate.

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ATP in cellular function

Energy released from ATP hydrolysis powers cellular processes.

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ATP as energy carrier

ATP transfers energy between catabolic and anabolic processes.

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Hydrolysis

A chemical reaction that uses water to break down a molecule and release energy.

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Chlorophyll and plant color

Chlorophyll, a green pigment, is responsible for the green color of plants. It reflects green light and absorbs other colors, primarily red and blue.

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Accessory pigments

Pigments in plants that absorb light wavelengths chlorophyll cannot, helping plants utilize a broader spectrum of sunlight.

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Why do plants have green leaves?

Plants are green because chlorophyll, the primary pigment for photosynthesis, reflects green light and absorbs other colors.

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What happens when all light is absorbed?

If all colors of light are absorbed by a pigment, it appears black.

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What happens when all light is reflected?

If all colors of light are reflected by a pigment, it appears white.

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Why are accessory pigments important?

Accessory pigments expand the range of light absorbed by plants, allowing them to capture more energy for photosynthesis.

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Why is the visible light spectrum important for plants?

Plants utilize different colors of the visible light spectrum for photosynthesis. Different pigments absorb different wavelengths, maximizing energy capture.

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Carotenoids

Pigments that absorb light in the violet to greenish-blue range, appearing yellow, orange, or red. They transfer energy to chlorophyll a.

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Anthocyanins

Pigments that do not participate in photosynthesis, showing colors like red, purple, blue, and violet. They are often found in flowers and fruits.

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Xanthophylls

Pigments that absorb light and transfer energy to chlorophyll a. They act as antioxidants, protecting cells from damage.

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Photosynthetic pigments

Pigments that capture light energy for photosynthesis. They include chlorophyll a, carotenoids, and xanthophylls.

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What is the role of accessory pigments?

Accessory pigments like carotenoids and xanthophylls absorb light energy and transfer it to chlorophyll a, increasing the range of light absorbed by the plant.

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Why are some leaves red in the fall?

Anthocyanin pigments accumulate in leaves during autumn, contributing to their red coloration. This helps protect against damage from excessive sunlight.

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Where are photosynthetic pigments located in a plant cell?

The chloroplasts, which are organelles found within plant cells, contain photosynthetic pigments like chlorophyll a, carotenoids, and xanthophylls.

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Study Notes

Role of ATP and Importance of Plant Pigments

  • ATP is an organic molecule used for short-term energy storage and transport in cells
  • ATP is composed of adenine, ribose, and three phosphate groups
  • The three phosphate groups in ATP are negatively charged, making them unstable
  • Hydrolysis of ATP (breaking the bond between phosphate groups) releases energy
  • ATP hydrolysis is reversible, creating an ATP-ADP cycle
  • ATP acts like a rechargeable battery, charged (ATP) and uncharged (ADP) forms
  • Energy released during ATP hydrolysis can power other cellular processes
  • The process of transferring energy from one reaction to another is called energy coupling
  • Exergonic reaction releases free energy
  • Endergonic reaction absorbs free energy
  • Energy coupling involves an exergonic and endergonic reaction
  • Example of energy coupling: Formation of sucrose from glucose and fructose
    • First, a phosphate group is transferred from ATP to glucose forming glucose-P
    • Then, the glucose-P intermediate reacts with fructose to produce sucrose
    • This reaction also releases energy

Importance of Plant Pigments

  • Light from the sun, absorbed by colorful compounds called pigments
  • Pigments' structure and quantity determine plant color variations
  • Chlorophyll in leaves absorbs light energy for photosynthesis
  • Chlorophyll absorbs light from violets/blues and reds
  • It reflects green light, making leaves appear green
  • If all colors are absorbed and no color is reflected, pigment appears black
  • If all colors are reflected and no color is absorbed, pigment appears white

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