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BIOA01H3 Chapter 1: Chapter 1-Exploring the Diversity of Life

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tealhedgehog398
29 Sep 2011
School
UTSC
Department
Biological Sciences
Course
BIOA01H3
Professor
Zachariah Campbell

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BIOA01H3 Full Course Notes
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Document Summary

Light serves two important functions for life on earth. The wavelength of electromagnetic radiation ranges from less than one picometre for cosmic rays to more than a kilometer for radio waves. 400nm (blue light) to about 700nm (red light). These particles or: light has no mass but it is able to interact with and change matter. These changes allow light to be used packets of energy are referred to as photons. radiation. : particles or packets of energy: photons have no mass, but each contains a precise amount of energy, the amount of energy in a photon is inversely related to its wavelength. This means that blue light, with: when photons of light hit an object, the photons have 3 possible fates: a shorter wavelength consists of photons that have higher energy than longer wavelength red light. All pigments share a common feature critical to light absorption: a region where carbon. : a molecule that can absorb photons of light.

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Related Questions

4. Photosynthesis is actually a two step process (eachstep is a very complex sequence of events). Name theprocesses and where they occur in the cell.

Process Whereit occurs

Process Whereit occurs

A closer look at the Lightreactions

5. Why do we say that light travels inwavelengths? What is a wavelength of light?

6. What is a photon of light?

7. In the electromagnetic spectrum of light, a very smallpercentage of wavelengths are visible light. Why/How canwe see these wavelengths?


8. What occurs in a redox reaction? In photosynthesis, which molecules are oxidized (loss of electrons)? Which molecules are reduced (gain of electrons)? 9. What are the two stages of photosynthesis? 10. Why are plants green? What are the light-absorbing pigments found in chloroplasts? Which visible wavelengths of the electromagnetic spectrum are absorbed by these pigments? 11. What is a photosystem? Where are photosystems found in the chloroplast? What happens when light is absorbed by a photosystem?

Answer the two questions.
1. During the light reactions:

(a) What force is responsible for driving H+ into the thylakoid space?

(b) What drives the H+ to leave the thylakoid space?

(c) How is the creation of a concentration gradient related to the formation of ATP?

2. Describe the electromagnetic spectrum. What kind of light drives photosynthesis? What is the wavelength range of this light?