The evolution of eukaryotic cells most likely occurred in many steps. Outline the steps that may have occurred beginning with the formation of biological molecules and ending in complex structures observed in eukaryotic cells today
What will be an ideal response?
Answer: Answers should include phases or steps such as (1) abiotic synthesis of organic molecules under hot, reducing conditions; (2) polymerization of organic molecules into nucleic acids and proteins (students could also include that RNA may have been the first informational molecule and biological catalyst); (3) encapsulation of organic polymers in a simple membrane; (4) endosymbiosis of smaller cells (bacteria) inside a larger nucleated cell to form membrane-bound organelles such as mitochondria and chloroplasts.
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What is the difference in the bonding between alpha-helix and beta sheets?
A. Hydrogen bonding between the amides only occurs in one of these two types of secondary structures. B. Hydrogen bonding occurs between the amides of adjacent chains in the sheets instead of between the amides in different parts of the helices. C. Sulfur bridges allow the spring like turns in alpha helices and van der Waals dispersion allows the folds in beta sheets. D. Hydrogen bonding always occurs in the alpha helices but only occurs in parallel beta sheets.
In both stems and leaves, photosynthetic tissues lie beneath the __________
a. cortex b. periderm c. pith d. epidermis e. sclerenchyma.
The two circuits in the heart and the cardiovascular system have the same blood pressure.
a. true b. false
Which of the following is least likely to be a cause of extinction?
A. Asteroid impact B. Human activity C. Adaptive radiation D. Continental drift E. Climate change