What is the importance of Prochlorococcus for life on the planet Earth, both historically and in the present day?

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SCI 115 Week 3 Discussion STR

Energy for Life / Energy Reactions and Processes

In your primary post, please write a response of at least 125 words to one of the following three topics, using your own words. In addition, please make a substantive reply to a fellow student on any topic.

Topic 1. The phytoplankton that brought Earth to life. Review the video (1)* about the “phytoplankton that brought Earth to life” from the link given below, or from the link in the Instructor’s Insights area. In this clip, which is under 5 minutes in length, Penny Chisholm discusses a tiny phytoplankton called Prochlorococcus. Based on that video, please address the following:

• (a) What is the importance of Prochlorococcus for life on the planet Earth, both historically and in the present day?
• (b) Explain what the known geographic variations in Prochlorococcus tell us about relationships between organisms and their environments.

Topic 2. Characteristics of ATP. If you choose this topic for your primary post, you must base your post on the instructor’s video about ATP (2)*. The video can be found in the Instructor Insights area.

• (a) Describe at least three specific points that the video makes about ATP.
• (b) Explain how this fits with this week’s lessons.
• Please note that I am looking for specific points that are covered in the video, so material gleaned from Wikipedia or other sources may not meet the requirements.

Topic 3. Chemosynthesis in the Giant Tubeworm. The Giant Tubeworm (Riftia pachyptila) is an animal that lives on the floor of the ocean, near hydrothermal vents that release very hot, chemical-rich water. The adult form of the tubeworm is sessile, which means that it plants itself in one place, and doesn’t have any locomotion. Riftia pachyptila has a unique way of getting the energy that it needs to stay alive (3)* (4)* (5)*.

• (a) Describe how Riftia pachyptila gets its energy.
• (b) Discuss how this relates to this week’s lessons.

References*

1. PBS Newshour, March 5, 2014, The phytoplankton that brought Earth to life, https://youtu.be/m_43nR11PW8
2. James Cox, 2015, Four minutes about ATP, see Kaltura video via the “Instructor’s Insights” area for Week 3.
3. Deep Marine Scenes, 2013, Facts: Giant tube worms, https://www.youtube.com/watch?v=IddCPTnmj4Q
4. JKM12988, December 5, 2016, Giant tube worms and symbiotic bacteria, https://www.youtube.com/watch?v=dg6ZewBTRj8&t=6s
5. Kristen M. Kusek, January 12, 2007, Deep-sea tubeworms get versatile ‘inside’ help, http://www.whoi.edu/oceanus/feature/deep-sea-tubeworms-get-versatile-inside-help

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