1000 units of information
A. Nucleus
B. Cytoplasm
C. Mitochondrion
D. Ribosome
Answer:Cells need to make proteins. ... While a structure such as a nucleus is only found in eukaryotes, every cell needs ribosomes to manufacture proteins. Since there are no membrane-bound organelles in prokaryotes, the ribosomes float free in the cytosol. Ribosomes are found in many places around a eukaryotic cell.
Explanation:
Answer:
All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike prokaryotes, eukaryotic cells also possess internal membranes that encase their organelles and control the exchange of essential cell components.
Explanation:
The cell membrane, therefore, has two functions: first, to be a barrier keeping the constituents of the cell in and unwanted substances out and, second, to be a gate allowing transport into the cell of essential nutrients and movement from the cell of waste products.
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Answer: Receptor
Explanation: a protein that detects a signal molecule and performs an action in response.
A receptor protein is a type of protein that detects a signal molecule (ligand) and performs an action in response. It can induce a chemical reaction within the cell or initiate a signaling pathway which can change the cell's behaviour.
A protein that detects a signal molecule and performs an action in response is called a receptor protein. Receptor proteins in or on a target cell bind to specific molecules outside the cell called ligands. When a ligand binds to its specific receptor, it induces a chemical reaction within the cell. This binding could open a channel for certain ions to flow into the cell or initiate a signaling cascade or pathway with the help of second messengers, enzymes, and other proteins. The signaling cascade eventually leads to a change in the cell's environment or behavior. For example, neurotransmitters such as dopamine can act as ligands, binding to dopamine receptor proteins on nerve cells and causing specific responses in these cells.
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