21 Questions
What was the critical characteristic of the macromolecule from which life evolved?
Ability to replicate itself
What role did RNA play in the early stages of life?
It was involved in the start of life, potentially leading to the genetic code.
What is the role of phospholipid membranes in cells?
They create a stable barrier and environment for cellular processes.
Which molecule is primarily responsible for storing and transmitting genetic information?
DNA
What is the primary function of ribosomes in the cell?
Protein synthesis
In the context of cell biology, what is a 'gene'?
A segment of DNA that encodes a functional product, typically a protein
Which process best describes the function of messenger RNA (mRNA) in cells
It carries genetic information from DNA to the ribosome.
What is the primary role of enzymes in biological reactions?
To speed up chemical reactions.
In the context of cell biology, what is osmosis primarily concerned with
The flow of water molecules across a semipermeable membrane.
What is a key feature of a prokaryotic cell?
It lacks membrane-bound organelles.
In cell biology, what is the primary function of mitochondria?
Energy production
Which type of cell junction forms a barrier to prevent leakage of extracellular fluid across a layer of epithelial cells?
Tight junctions
How did RNA contribute to the early stages of life, according to the RNA World hypothesis?
By functioning as the first genetic material
What is the role of phospholipid membranes in the formation of the first cells?
In the context of early cellular life, what was the significance of protein synthesis?
It allowed for the development of more complex cellular functions
What was the primary role of RNA in the early stages of life according to the RNA World hypothesis?
It functioned as the first genetic material and catalyzed chemical reactions.
What role did phospholipid membranes play in the formation of the first cells?
They created a stable barrier for evolving cellular structures.
What is the significance of protein synthesis in early cellular life?
It allowed for the development of more complex cellular functions.
What is the role of RNA in protein synthesis?
RNA carries the genetic code needed for constructing proteins.
What was the likely structure of the first cell?
A self-replicating RNA enclosed in a protective membrane.
What is the primary function of a phospholipid membrane in cells?
To create a stable barrier and environment for cellular processes.
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