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BIOL 1020 Lecture Notes - Lecture 12: Hemoglobin, Light-Dependent Reactions, Chromatin

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peachlouse675
7 Dec 2015
School
Auburn University
Department
Biology
Course
BIOL 1020
Professor
Dute

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BIOL 1020 Full Course Notes
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BIOL 1020 Full Course Notes
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Document Summary

Pigment: any substance that absorbs light (the absorption of light energy starts photosynthesis) Absorption spectrum: the major pigment of photosynthesis; extract by boiling leaves in alcohol to get photosynthetic pigments. Put those pigments in front of a prism and pass it through a chlorophyll mixture to see which ones are absorbed. Chlorophyll a (major photosynthetic pigment) is in the blue range. In the middle of the spectrum there is little to no energy absorbed because chloroplasts reflect the green light. Chlorophyll b/ carotenoids (beta-carotene) make up the rest of the chlorophyll. Beta-carotene which is orange has a relative in plants called xanthophyll which is bright yellow. Expand the light energy that can be used in the process of photosynthesis (improve the efficiency of photosynthesis by absorbing lights in parts of the spectrum where chlorophyll a doesn"t), 2. Chlorophyll"s are very unstable and have the risk of taking in too much energy; beta-carotene and xanthophyll protect against this.

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Related Questions

Which statements are correct concerning the pigments used during photosynthesis? Select all that apply.

_____________________

The color of the pigment molecule will match the colors that it absorbs.
The photosynthetic pigments are located within the thylakoid lumen/space.
Pigment molecules typically contain large hydrophobic sections.
Plants can absorb a variety of light colors since they contain a variety of pigments.
All of the light energy used by plants is collected/absorbed by chlorophyll a and b.

Chlorophyll is a pigment that absorbs specific wavelengths of light, and the absorption of that light leads to the passage of electrons to a higher energy state, where chemical energy can then be harvested from them. You would expect that a plant exposed to which color of light would produce the most photosynthesis?

green
orange
yellow
blue

Which color of light would you expect chlorophyll to absorb the least?

green
red
yellow
blue

Most plants are green because....

chlorophyll absorbs green light well
chlorophyll does not absorb green light well
chlorophyll reflects green light well
both of the last two answers are correct

Thinking about the gases involved in respiration and photosynthesis, during the day, a plant is producing____ from respiration and releasing_____ from photosynthesis. But at night, a plant is only producing_______ from respiration.(spell your answers out completely).

Plants perform cellular respiration to produce.......

ATP
NADPH
sugar
oxygen

Which of the following is true about plants and cellular respiration?

plants perform cellular respiration only during the night
plants perform cellular respiration only during the day
plants perform cellular respiration during the night and day
plants do not perform cellular respiration

Which of the following is true regarding plants and photosynthesis?

plants perform photosynthesis only during the night
plants perform photosynthesis only during the day
plants perform photosynthesis during the night and day
plants do not perform photosynthesis

Is it possible for this plant to consistently do more cellular respiration than photosynthesis?

yes, plants use excess ATP for growth
yes, but only during winter months
not today, but fossil records shows they did in the past
no, plants can't consume food faster than they make it

Photosynthesis Lab Report

  1. Plant Structure and Function

  1. Through the process called __________ plants convert lightenergy into

__________ energy. Record your answerbelow.

  1. In which structure of the plant does photosynthesis occur?

  1. What is the difference between xylem and phloem?

  1. Based on lab, Exercise 1, what is the name and function of thestructure labeled with the letter “H”?

  1. Chloroplast
  1. Based on Lab, Exercise 2, draw and label each part of thechloroplast. Sign, date and prepare an image of your drawing andinclude it with this lab report.

  1. What part of the process of photosynthesis occurs in thethylakoid compartment?

  1. What is the name and function of the structure labeled with theletter “E” in Exercise 2?

  1. Photosynthetic Products

  1. What are the three products of photosynthesis?

  1. What happens to the glucose that is not metabolizedimmediately?

  1. In the test for starch, which tube demonstrated a positive testfor starch? How do you know?

  1. Based on Lab, Exercise 3 explain why part of the leaf was amberin color.

  1. Light Absorption
  1. What pigment is used by plants to absorb light?

  1. In the video demonstration in Exercise 4 what happens to thelight spectrum when a green filter is placed in front of the lightsource?

  1. In step 3 of Exercise 4, which color was not absorbed by thespinach pigments?

  1. Photosynthetic Pigments
  1. What process is used in Exercise 5 to separate the plantpigments?

  1. Look at the chromatogram results in Exercise 5. What color isreflected by chlorophyll a?
  1. Which pigment reflected an orange color?

VI. Effect of Light and Temperature onPhotosynthesis

  1. What was the conclusion of Blackman’s first experiment on theeffect of light on photosynthesis?
  1. In his second experiment, what effect did increasingtemperature have on the rate of photosynthesis?

  1. Record the data from Exercise 6 below.

Lamp Distance

Temperature

Ave Bubble/min

75 cm

50 cm

25 cm

  1. In the experiment in Exercise 6, what conclusion can be drawnabout the effect of light and temperature on rate ofphotosynthesis?

Summary Questions

  1. Why do heterotrophs depend on autotrophs?

  1. Name two reactants necessary for photosynthesis to occur.

  1. How would the process of photosynthesis be affected if a planthad no stomata?
  1. What tool is used to separate white light into differentwavelengths of color?

  1. Explain why we see the color green on the leaves ofplants.

  1. What color is absorbed the least by the petals on asunflower?

  1. Photosynthesis consists of two phases. Which phase would beleast affected by living in an area where there are shorter daysand long periods of darkness?

  1. How could air pollution affect food production and the priceyou pay for food at the supermarket?