Most likely the proto-cells were little more than membrane sacs protecting information-storing template and various metabolic agents from the environment. Which probable stage of physical and chemical evolution of life is that?
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- Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion years ago. But how did the first living cells appear?In what way was the evolution of eukaryotic cells linked to the increase in the oxygen concentration in the atmosphere that occurred during the Precambrian?Without an oxygen-free atmosphere, the organic compounds that started the story of life never would have been formed on their own. Free oxygen would have attacked them. Which probable stage of physical and chemical evolution of life is that?
- What types of similarities in cell structure and function tell biologists about the common origin of organisms? Explainplace the evolutionary steps that led to complex multicellularity in the order in which they thought to have occurred. a) The ability of cells to stick to each other b) Differential gene expression in cells c) The ability to communicate between cells d) The ability to move molecules by bulk flowYou are examining an organism you believe to be an animal. Which of the following would NOT support your hypothesis? O A The organism appears to be heterotrophic. O B The organism appears to be multicellular. O C The organism appears to be motile. O D The organism appears to have cell walls. O E All animals, including sponges, have development directed by Hox genes.
- Serial endosymbiosis is the most supported theory on how the first eukaryotic cells evolved from prokaryotic cells. The figure depicts the evolution of eukaryotic cells which include links to prokaryotic cells from early in the history of life. Identify the cellular structures involved in the connection of eukaryotic and prokaryotic cells. Describe the characteristics of the cellular structures that supports the evolutionary connection. State a claim on how eukaryotic cells evolved. Using evolutionary evidence justify your claim. The cells modeled above are a result are descendants of an original cell.Would the following ancestral cell have been a prokaryote or an early eukaryote? Briefly explain your answer.Describe the step-wise process of how inorganic matter on primitive Earth evolved into multicellular, eukaryotic cells. Be sure to provide enough detail with each step and make sure you cover inorganic, organic, protocells, prokaryotic, energetics, eukaryotic, and multi-cellularity
- Which of the following is an accurate point that supports the idea that the earliest protocells relied first on RNA (not DNA) as inherited information? A. RNA is composed of lipids, and lipids were present on early Earth before the nucleotides that compose DNA were B. RNA is a monomer (unlike DNA), so it is simpler and more likely to have been used by these simple protocells C. DNA would have been too large to fit into the small protocells, but RNA was small enough to fit D. RNA can serve dual roles as both genetic information storage and an enzyme (but DNA cannot do both) ..Do plants and animals have a common multicellular ancestor?Based on the accompanying evolutionary tree, which prokaryotic domain gave rise to the domain Eukarya? Which kingdom in domain Eukarya gave rise to plants, animals, and fungi?