What step occurred first in the evolution of life?
a. formation of protein-RNA systems
b. formation of lipid spheres
c. formation of membrane-bound protocells
d. formation of ATP
e. spontaneous formation of lipids, proteins, carbohydrates, and nucleotides
e
You might also like to view...
Many different structures make up a cell and have unique functions. Each cell structure is associated with a critical function in the cell. These pairings include
_____ microfilaments; cytoskeleton. _____ lysosomes; protein synthesis. _____ nucleus; DNA replication. _____cell membrane; barrier between the cell and the external environment _____ Golgi apparatus; modification, processing, and sorting of macromolecules.
The decline of the sea otter population in the Pacific Northwest has been attributed to
A. pollution from an oil spill. B. predation by killer whales. C. a genetic mutation causing a decrease of fertility in male otters. D. an increase in the water temperature. E. predation by Steller sea lions.
Okazaki fragments are joined together by:
a. RNA polymerase. b. DNA ligase. c. DNA polymerase. d. RNA ligase. e. primase.
A normal cell is anchorage-dependent for growth and mortal
a. true b. false