Biology Week 1: ATP-ADP Cycle

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Questions and Answers

What is the primary outcome of aerobic respiration in cells?

  • Production of ethanol and carbon dioxide
  • Breakdown of glucose without ATP
  • Generation of heat and light energy
  • Conversion of chemical energy into ATP (correct)

Which stage of the Calvin cycle involves incorporating CO2 into an organic material?

  • Reduction
  • Carbon fixation (correct)
  • Electron transport chain
  • Regeneration of RuBP

What is the net gain of ATP produced during aerobic respiration?

  • 10 ATP
  • 2-4 ATP
  • 36-38 ATP (correct)
  • 24 ATP

What distinguishes anaerobic respiration from aerobic respiration?

<p>It does not require oxygen. (B)</p> Signup and view all the answers

In the Calvin cycle, what happens to some of the G3P molecules produced during reduction?

<p>They are recycled to regenerate RuBP. (B)</p> Signup and view all the answers

What is the primary function of ATP in cells?

<p>It acts as the energy currency of the cell. (D)</p> Signup and view all the answers

What defines the process of phosphorylation?

<p>The addition of phosphate to an organic compound. (D)</p> Signup and view all the answers

Which term describes the process that provides free energy to phosphorylate ADP?

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

What is hydrolysis in the context of ATP?

<p>The process of breaking down ATP into ADP and a phosphate group. (A)</p> Signup and view all the answers

Which of the following describes an endergonic reaction?

<p>It absorbs energy to do work. (C)</p> Signup and view all the answers

Which component of ATP is responsible for storing energy?

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

What role do pigments play in cells?

<p>They absorb visible light of different wavelengths. (C)</p> Signup and view all the answers

What is the effect of photoexcitation on a molecule?

<p>It produces an excited state by photon absorption. (C)</p> Signup and view all the answers

What role do carotenoids play in plants?

<p>They assist in photosynthesis. (C)</p> Signup and view all the answers

What is the primary green pigment found in the thylakoid of chloroplasts?

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

Which part of the chloroplast is responsible for the absorption of light?

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

What does visible light refer to in terms of wavelength?

<p>380-750 nm (D)</p> Signup and view all the answers

Which fruit is NOT known to contain xanthophyll?

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

What is the function of the porphyrin ring in chlorophyll?

<p>To absorb photons (B)</p> Signup and view all the answers

Which of the following pigments is primarily responsible for red and purple colors in fruits?

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

What is the structure that represents a stack of thylakoids?

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

What is the main function of the light harvesting complex in photosynthesis?

<p>To funnel energy from photons to the reaction center (A)</p> Signup and view all the answers

Which of the following is NOT a product of the light reactions of photosynthesis?

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

Where do photosystems 1 and 2 primarily take place within the plant cell?

<p>Thylakoid or Granum (A)</p> Signup and view all the answers

What is the outcome of the noncyclic electron flow during photosynthesis?

<p>Generation of ATP and NADPH (C)</p> Signup and view all the answers

Which component is primarily associated with reducing NADP+ to NADPH?

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

During which phase of photosynthesis is glucose produced?

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

What is the role of ATP synthase in photosynthesis?

<p>To synthesize ATP from ADP and phosphate (A)</p> Signup and view all the answers

What initiates the process of cellular respiration?

<p>Conversion of glucose into energy (D)</p> Signup and view all the answers

What is the primary location for glycolysis to occur?

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

Which of the following is a product of the Krebs Cycle?

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

Which molecule is produced during the electron transport chain?

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

What type of organism are obligate anaerobes?

<p>Microorganisms that are killed by normal atmospheric concentrations of oxygen (A)</p> Signup and view all the answers

What is the net gain of ATP during glycolysis?

<p>2 ATP (A)</p> Signup and view all the answers

Which of these is the final product of fermentation in animal cells?

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

Facultative anaerobes can perform which of the following processes in the absence of oxygen?

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

During the electron transport chain, what input molecules are primarily required?

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

Flashcards

Carotenoids

Plant pigments that give fruits and vegetables their yellow, orange, and red colors.

Chlorophyll

A green pigment in plants that absorbs light for photosynthesis, primarily in the blue and red part of the light spectrum causing the plant to appear green.

Chloroplast

A disc-shaped organelle in plant cells where photosynthesis occurs.

Xanthophyll

A type of carotenoid that gives fruits and vegetables yellow colors.

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Anthocyanins

Plant pigments responsible for the red, purple, and blue colors of fruits and flowers.

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Photosynthesis

The process by which plants use sunlight to create sugars from carbon dioxide and water.

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Visible Light

Electromagnetic radiation with wavelengths between 380-750 nm that plants use for photosynthesis.

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Light (photons)

Streams of photons, packets of energy that travel as waves, part of the electromagnetic spectrum.

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Chloroplast structure

Chloroplasts have outer and inner membranes, stroma, thylakoid membranes, and grana.

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ATP

Adenosine triphosphate, the energy currency of the cell, used in various cellular processes.

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ADP

Adenosine diphosphate, a key compound in metabolism, crucial for energy flow in living cells.

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Phosphorylation

Adding a phosphate group to a molecule, often adding energy.

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Dephosphorylation

Removing a phosphate group from a molecule, often releasing energy.

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Catabolism

Breakdown of complex molecules into simpler ones, releasing energy.

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Anabolism

Building complex molecules from simpler ones, requiring energy.

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Exergonic

A reaction that releases energy.

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Endergonic

A reaction that requires energy to occur.

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chemical work

Synthesis of polymers from monomers.

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transport work

Moving substances across membranes.

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mechanical work

Beating of cilia, muscle contractions.

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Hydrolysis

Breaking down a molecule by chemically adding water.

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Photoexcitation

Producing an excited state in a system by absorbing light.

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Aerobic Respiration

A set of metabolic reactions that use oxygen to convert chemical energy into ATP in cells.

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ATP

Adenosine triphosphate; the main energy currency of cells.

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Calvin Cycle

A series of reactions that converts carbon dioxide into glucose.

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Carbon Fixation

The initial step in the Calvin cycle, where inorganic carbon is incorporated into organic molecules.

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Reduction

The stage in the Calvin cycle where electrons are transferred, converting molecules.

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Regeneration of RuBP

The stage of the Calvin cycle where RuBP is regenerated to continue the cycle.

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Anaerobic Respiration

Cellular respiration that does not require oxygen to produce energy.

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Glycolysis

The first stage of respiration, breaking down glucose.

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Kreb's Cycle

A part of aerobic respiration that occurs in the mitochondria.

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Electron Transport Chain (ETC)

A series of reactions in respiration that produces much ATP.

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Light Harvesting Complex

A group of pigments bound to proteins that capture light energy and transfer it to the reaction center.

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Reaction Center Complex

A complex containing a pair of chlorophyll a molecules and a primary electron acceptor that initiates electron transfer during photosynthesis.

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Photosystem 1 (PS1)

A photosystem in the thylakoid membrane that absorbs light at a wavelength of 700nm and is involved in ATP and NADPH production.

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Photosystem 2 (PS2)

A photosystem in the thylakoid membrane that absorbs light at a wavelength of 680nm, splits water, and releases oxygen as a byproduct.

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Light Reaction

The first stage of photosynthesis, where light energy is used to produce ATP, NADPH, and oxygen.

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Dark Reaction (Calvin Cycle)

The second stage of photosynthesis, where ATP and NADPH are used to convert CO2 into glucose.

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Cyclic Electron Flow

A process that produces ATP without producing NADPH, using only Photosystem 1.

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Chemiosmosis

Movement of ions across a membrane down their electrochemical gradient.

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ATP Synthase

An enzyme that produces ATP using the energy from the hydrogen ion gradient.

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NADP Reductase

An enzyme that reduces NADP+ into NADPH.

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Photosynthesis

The process by which plants and other organisms convert light energy into chemical energy.

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Autotrophic Process

A self-feeding method of making energy using light and other components.

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Cellular Respiration

The process of breaking down glucose to release energy, producing ATP.

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Prokaryotes and Eukaryotes

Both types of cells use cellular respiration to release energy.

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Glycolysis

First stage of cellular respiration, breaking glucose into pyruvic acid.

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Glycolysis Location

The cytoplasm

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ATP in Glycolysis

Net gain of 2 ATP from glycolysis.

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Fermentation

A process that creates energy from glucose without oxygen.

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Krebs Cycle Location

Mitochondria matrix

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Krebs Cycle Input

Acetyl Coenzyme A, NAD+, FAD, ADP, and H2O

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Krebs Cycle output

Carbon dioxide, ATP, NADH, and FADH2

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Electron Transport Chain (ETC) Location

Inner mitochondrial membrane

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Electron Transport Chain (ETC) Input

NADH, FADH2, ADP, O2

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Electron Transport Chain (ETC) Output

ATP, H2O, NAD+

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Facultative Anaerobes

Organisms capable of switching to fermentation if oxygen is absent.

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Obligate Anaerobes

Organisms that are killed by oxygen.

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NADH

An electron carrier important in cellular respiration and energy production.

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FADH2

An electron carrier in cellular respiration, aiding energy production.

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Study Notes

Week 1: ATP-ADP Cycle

  • ATP (adenosine triphosphate) is the energy currency used throughout cells.
  • ATP is composed of adenine, ribose, and phosphate groups.
  • Phosphorylation is the addition of a phosphate group to an organic compound, adding energy.
  • Dephosphorylation is the removal of a phosphate group, releasing energy.
  • Catabolism breaks down complex molecules into simpler ones, providing free energy for phosphorylation.
  • Anabolism builds complex molecules from simpler ones, requiring energy.
  • Exergonic reactions release energy, while endergonic reactions absorb energy.
  • ATP is essential for chemical work, transport work, and mechanical work within cells.
  • ADP (adenosine diphosphate) is an important compound in cellular metabolism and energy flow.
  • Hydrolysis breaks down bonds between phosphate groups in ATP to form ADP and release energy.

Week 2: Structure of Chloroplast

  • Chloroplasts are organelles in plant and photosynthetic algal cells.
  • Chloroplasts carry out photosynthesis.
  • Chromatography separates components of mixtures based on differences in structure or composition.
  • Pigments absorb light, changing or adding color to an object.
  • Different pigments absorb light at different wavelengths.
  • Carotenoids provide yellow, orange, and red colors to plants and fruits.
  • Xanthophyll is a type of hydrocarbon pigment.
  • Chlorophyll absorbs blue and red light, giving plants their green color.
  • Photoexcitation is the process where a quantum system is energized by photon absorption.

Week 3: Photosynthesis

  • Photosynthesis is the process in which plants and plant-like organisms create energy from sunlight.
  • The chemical equation for photosynthesis is 6CO2 + 6H2O → C6H12O6 + 6O2.
  • Photosynthesis involves light-dependent and light-independent reactions.
  • Light reactions take place in the thylakoid membrane, producing ATP, NADPH, and oxygen.
  • Dark reactions (Calvin Cycle) involve CO2, taking place in the stroma to produce glucose.
  • Photosystems 1 and 2 are located on thylakoids, absorbing light energy to create chemical energy.
  • Chemiosmosis is the movement of ions across a membrane creating chemical energy.
  • NADP reductase produces the electron carrier NADPH.
  • ATP synthase produces ATP.

Week 4: Cellular Respiration

  • Cellular respiration is the process of converting sugars into usable energy, creating ATP.
  • Aerobic respiration requires oxygen, producing 36-38 ATPs.
  • Anaerobic respiration does not require oxygen, producing 2 ATPs.
  • Glycolysis, Krebs cycle, and electron transport chain are involved in aerobic respiration.
  • Glycolysis breaks down glucose into pyruvate in the cytoplasm.
  • Krebs cycle in mitochondria converts pyruvate into CO2, ATP, NADH, and FADH2
  • The electron transport chain uses energy from NADH and FADH2 to produce ATP.
  • Fermentation is a type of anaerobic respiration that produces lactic acid or ethanol.

Week 5: Glycolysis, Krebs Cycle, Electron Transport Chain

  • Glycolysis is the breakdown of glucose into pyruvate, producing ATP and NADH.
  • The Krebs cycle (citric acid cycle) processes pyruvate, producing ATP, NADH, FADH2, and CO2.
  • The electron transport chain uses electron carriers (NADH and FADH2) to produce ATP and water.
  • These processes occur in mitochondria.

Week 6: Fermentation

  • Facultative anaerobes utilize aerobic respiration in the presence of oxygen, and fermentation otherwise.
  • Obligate anaerobes cannot survive in the presence of oxygen, relying on fermentation.
  • Fermentation releases energy from glucose without oxygen.
  • Alcoholic fermentation produces ethanol and carbon dioxide, used in making alcohol.
  • Lactic acid fermentation produces lactic acid, used in dairy industries.

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