Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 7.2, Problem 2CC
Summary Introduction
To determine:
The three ways that can be used to make a photoexcited electron more stable.
Introduction 
When an electron is struck by a correct amount of photons, it jumps from a ground state to a higher energy level. During this happening, an orbital is occupied by the electron that is farther away from the nucleus. When the distance between the nucleus and electron increases, then the electron is said to be unstable.
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Photosynthesis is defined as the chemical process, wherein carbon dioxide in the presence of water and radiant energy gets converted to glucose (chemical energy), giving out oxygen as byproducts. In the equation, the combining reactants and resulting products are expressed along with their respective numbers of molecules. Putting this in a simplified formula, the following equation represents this process.
CO2 + H2O + Light energy → C6H12O6 + O2
Considering this equation, how plant lovers (plantitos and plantitas) able to cultivate their plants?
DCPIP (2,6-dichlorophenol-indophenol), a blue dye, can act as an electron acceptor and becomes colorless when reduced. A suspension of chloroplasts is prepared, and DCPIP is added to the suspension. The sample is split into two test tubes. One test tube is exposed to light and the other is wrapped in foil (dark control). What would you observe over time comparing the light exposed and the dark control test tubes?
A.
The sample exposed to light stays blue. The sample kept in the dark turns colorless.
B.
The sample exposed to light turns colorless. The sample wrapped in foil stays blue.
C.
Both samples stay blue.
D.
Both samples turn colorless.
(g) The figure given below represents an
experiment to demonstrate a particular
aspect of photosynthesis. The alphabet 'A'
represents a certain condition inside the
flask.
2
КОН
(i) What is the aim of the experiment ?
(ii) Identify the special condition inside the
flask.
(iii) Name an alternative chemical that can be
used instead of KOH.
(iv) In what manner do the leaves 1 and 2
differ at the end of the starch test ?
Chapter 7 Solutions
Principles of Biology
Ch. 7.1 - Which types of organisms carry out cellular...Ch. 7.1 - Prob. 1BCCh. 7.1 - Prob. 2CCCh. 7.1 - Prob. 1TYKCh. 7.1 - If you were traveling from the cytosol to the...Ch. 7.1 - Prob. 3TYKCh. 7.2 - Prob. 1CCCh. 7.2 - Prob. 2CCCh. 7.2 - What is the advantage of having different pigment...Ch. 7.2 - Prob. 4CC
Ch. 7.2 - Prob. 5CCCh. 7.2 - Prob. 1TYKCh. 7.2 - Prob. 2TYKCh. 7.2 - What is the purpose of cyclic...Ch. 7.3 - Prob. 1CCCh. 7.3 - Prob. 1TYKCh. 7.3 - Prob. 2TYKCh. 7.4 - Prob. 1CCCh. 7.4 - Prob. 1TYKCh. 7.4 - Prob. 2TYKCh. 7.5 - Prob. 1CCCh. 7.5 - Prob. 1BCCh. 7.5 - What are the advantages and disadvantages for C3,...Ch. 7.5 - Prob. 1TYKCh. 7.5 - An evolutionary adaptation to minimize...Ch. 7 - The water necessary for photosynthesis is split...Ch. 7 - Prob. 2TYCh. 7 - Prob. 3TYCh. 7 - Prob. 4TYCh. 7 - During the first phase of the Calvin cycle, carbon...Ch. 7 - Prob. 6TYCh. 7 - Prob. 7TYCh. 7 - Prob. 8TYCh. 7 - Prob. 9TYCh. 7 - Plants commonly found in hot and dry environments...Ch. 7 - What are the two stages of photosynthesis? What...Ch. 7 - What is the function of NADPH in the Calvin cycle?Ch. 7 - A principle of biology is that living organisms...Ch. 7 - Discuss the advantages and disadvantages of being...Ch. 7 - Prob. 2CBQ
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- To assess photosynthesis, we relied heavily on a spectrophotometer to measure the color intensity of DCPIP in our solution. We set the spectrophotometer at wavelengths in the visible spectrum. What is the approximate wavelength range (in nm) for the visible spectrum? For example, the ultraviolet spectrum wavelength range is approximately 10-400 nmarrow_forwardAt your work station, you have a spectrophotometer set at 600 nm to measure DCIP absorbance and four (4) test tubes containing different solutions. One of the test tubes is labelled “0” to blank/zero the spectrophotometer. The other three (3) test tubes contain a reaction mixture from a Hill reaction experiment using isolated chloroplasts and DCIP as an electron acceptor. DCIP is present in the oxidized state and exhibits a blue color with an absorbance at 600 nm. Upon receiving the electrons, DCIP is reduced to form DCIP-H2 that is colorless. These three (3) tubes, labelled “A”, “B”, and “C” were exposed to different light conditions during the Hill reaction. The Light conditions were random, including No light, Red light, and Green light. Please note that chlorophyll preferentially absorbs the light with wavelength of 660 nm (red) when compared to that of 520 nm (green). Your mission is to determine which Tube came from which experimental light condition. Tube: Tube…arrow_forwardList four products of the light reactions.arrow_forward
- What fraction of the energy of 700-nm light absorbed by photosystem I is trapped as high-energy electrons?arrow_forward(a) Distinguish between photodissociation and photoionization.(b) Use the energy requirements of these two processesto explain why photodissociation of oxygen is moreimportant than photoionization of oxygen at altitudesbelow about 90 km.arrow_forwardIf a photosynthetic organism is illuminated in a closed, sealed environment, it is observed that the CO, and O, levels in the surrounding atmosphere reach a constant ratio. (a) Suggest an explanation. (b) What factor would you think primarily determines the value of this ratio?arrow_forward
- Given an equal amount of photons, what is the order of increasing effectiveness of blue, red, green, and white light (combination of the three main wavelengths) on photosynthetic activity?arrow_forward1. A) For the schematic of a chloroplast shown in the image attached, match the major input and output molecules of photosynthesis to the letters shown. Molecules: CO2, H2O, O2, sugar A: B: C: D: B) In the image attached, the light reactions are shown to take place in the thylakoid. Where specifically do these reactions take place? C) Where does the Calvin cycle take place?arrow_forwardWhat fraction of the energy of 700- nm light absorbed by photosystem I is trapped as highenergy electrons?arrow_forward
- The law of conservation of matter states that no matter on earth can be created or destroyed. Using the following equation: 6H2O + 6CO2 + Sunlight—> C6H12O6 + 6O2, explain how the process of photosynthesis is an example of this.arrow_forwardThe photosynthetic process, used by the chloroplasts of green plants and green algae, is best represented by which of the following balanced equations? C6H12O6 + 6O2 + 6H2O g 6CO2 + 12H2O C6H12O6 + C6H12O6 g C12H22O11 + H2O 6CO2 + 12H2O g C6H12O6 + 6O2 + 6H2O C12H22O11 + H2O g C6H12O6 + C6H12O6 6CO2 + 12H2S g C6H12O6 + 6S2 + 6H2Oarrow_forward1) If we put a photosynthetic organism in a closed, sealed environment and shine a light on it, we observe that the CO2 and O2 levels in the container reach constant levels. a) Explain why this would occur. b) What factor/value would you expect to be the primary determinant of this value?arrow_forward
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