Explain the proposed relationship between evolution of eukaryotes and the evolution of ocean chemistry.
In proterozoic eon that is 2500 to 543mya Earth's oceans were sulfidic at depths and oxic on the surface. These conditions did not favour much of the biologically important trace metals leading to their scarcity in marine environment. This ultimately restricts the nitrogen cycle, decreased primary productivity and limited distribution of eukaryotic algae.
Evolutionary patterns in fossils of "proterozoic eukaryotes"are explained by presence of trace elements in very less amounts in the sulfidic seas. This suggests that there is a "bioinorganic bridge" between evolution of eukaryotes and ocean chemistry.
Molybdenum and copper scarcity in sulfidic oceans might have increased the problem in eukaryotes of assimilating nitrogen. In cyanobacteria, depletion of ammonia result in formation of transcriptional regulators. hence, under limited nutrients eukaryotic algae compete effectively when N is available allowing them to store fixed N. In today's oceans large algae growth is favoured by high NO3 levels.
Explain the proposed relationship between evolution of eukaryotes and the evolution of ocean chemistry.
70.Explain how the phylogeny of Eukaryotes represents a polytomy between the supergroups. 71.Explain the relationship between Horizontal Gene Transfer, the Web of Life and plastids+mitochondria. 72.Explain why protist is a non-monophyletic term. Explain why algae is a non- monophyletic term. 73.What lineage underwent Tertiary endosymbiosis? 74.What are red tides? 75.What is a cause of bioluminescence in California? 76.What is diatomaceous earth, what supergroup is this related to? 77.Are most organisms in the Eukaryote super groups unicellular or multicellular? 78. Explain...
Bacteriology -Explain conditions on early earth that facilitated evolution of eukaryotes. -How is a sequence-based evolutionary analysis of microbes performed? --------------------------------------- -what are transgenic organisms and why is it relevant? -What is PCR Polymerase Chain Reaction and what is its importance? -Describe the process of molecular cloning using plasmids. -What is a palindrome and how is it used by restriction endonucleases?
what is the relationship between the theory of evolution and the diversity of life on Earth?
What is a blue ocean strategy? What is a red ocean strategy? Explain these from the perspective of company, competition, costs, and markets The authors allude to the fact that most companies borrow their strategic thinking from military models (see ‘Paradox of strategy’). How does this model affect perceptions related to competition and customers and what are the implications for creating value for markets (and employees!)? Using the ‘Snapshot of blue ocean creation’ exhibit, list and explain the key success...
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (15°C) at the ocean's surface and cooler water (3°C) 2,000 m below the surface. What is the maximum possible efficiency of the system? Enter your answer accurate to two decimal places.
What is the relationship between (1) the size of sediment grains carried by ocean water and (2) the energy of the water? (NOTE: this question is not about well-sorted versus poorly sorted sediments.) b) Suggest what oceanographers can learn from mapping the grain sizes of sediment that has settled onto the seafloor.
EVOLUTION AND MOLECULES OF THE CELL What is the proposed pathway for the evolution of cells, and how is it explained by the endosymbiont theory? What are the major macromolecules of the cell? What are the basic characteristics of polysaccharides, lipids, nucleic acids and proteins and how do these characteristics relate to the function of these macromolecules within the cell? How do the side chains of amino acids in proteins influence protein folding and its ultimate shape?
Explain and illustrate the developmental relationship between a fruit and the flower from which it is derived. Student Preparation Read text Chapter 19. Pre-lab Questions 1. In what three ways does reproduction in the angiosperms differ from that of the gymnosperms? How did the evolution of the flower promote the explosive diversification of the 2. Angiosperms in the Cretaceous? Strictly speaking, what is a fruit? Distinguish among simple, multiple, and aggregate fruits. Distinguish between fleshy and dry fruits. Distinguish between...
Which of the following is a major difference between prokaryotes and eukaryotes? a. Eukaryotes have linear chromosomal DNA, prokaryotes do not b. Eukaryotes live in extreme environments, prokaryotes do not c. Prokaryotes live in extreme environments, eukaryotes do not d. Only prokaryotes have histones, eukaryotes do no
Which of the following is different between prokaryotes and eukaryotes? a Prokaryotes are polycistronic and eukaryotes are monocistronic b Prokaryotes have more complex controls over gene expression than eukaryotes c mRNA only exists in eukaryotes. d DNA does exist in prokaryotes. 2. Do humans contain an 80s ribosome? True or False?