14 Questions
RNA is thought to be the earliest self-replicating ______, as it is capable of both storing genetic information and catalyzing chemical reactions
molecule
Cells emerged at least ______ billion years ago
3.5
The early cell membranes were probably more simple and ______ than modern ones
permeable
Lipids are known to spontaneously form ______ vesicles in water
bilayered
The current belief is that the early cells were ______
heterotrophs
The first cell membranes could also have been produced by catalytic ______
RNA
Some other entity with the potential to self-replicate could have preceded RNA, such as clay or ______ nucleic acid
peptide
They may have been carried to Earth on ______, created at deep-sea vents, or synthesized by lightning in a reducing atmosphere
meteorites
The ______ is that these cells were heterotrophs
current belief
Which of the following is a possible source of the first self-replicating forms on Earth?
All of the above
What is the current belief about the nature of the early cell membranes?
They were simpler and permeable than modern ones
Which molecule is thought to be the earliest self-replicating molecule?
RNA
What is a possible precursor to RNA as a self-replicating entity?
Clay
When did cells emerge on Earth?
3.5 billion years ago
Test your knowledge on cell navigation, control, and communication in this quiz. Explore how cells can efficiently navigate through complex mazes and identify the best routes. Learn about the generation of gradients and the sensing of maze junctions.
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