What tells the cells what to do?
Hidden inside almost every cell in your body is a chemical called DNA. A gene is a short section of DNA. Your genes contain instructions that tell your cells to make molecules called proteins.
Do cells know they are alive?
Cells don’t ‘know’ what to do – they just do a specific thing because the proteins they contain have caused that thing to happen. Because proteins are just large molecules (they are not alive), our understanding of what they do comes (in part) from the principles of chemistry and physics. So, there’s no magic going on.
How can we protect the cells in our body?
Antioxidants — such as vitamins C and E and carotenoids, which include beta-carotene, lycopene and lutein — help protect healthy cells from damage caused by free radicals.
What cell is made of?
Cells are the smallest common denominator of life. Some cells are organisms unto themselves; others are part of multicellular organisms. All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.
Can a cell exist without a cell wall?
Thread-like bacteria make cells that no longer have a cell wall under the influence of osmotic stress. A remarkable discovery, since the cell wall serves as a protection barrier for bacteria.
What can a cell live without?
2 Answers. The most essential thing for a cell to survive is a membrane. Without a membrane there is no boundary between cell and its surroundings. A selectively permeable membrane is needed for cells (from single celled organisms to elephants and giraffes and whales) to survive.
What happens if a cell didn’t have ribosomes?
Ribosomes are organelles that create proteins. Cells use proteins to perform important functions such as repairing cellular damage and directing chemical processes. Without these ribosomes, cells would not be able to produce protein and would not be able to function properly.
What cells have no ribosomes?
Cell Structures : Example Question #7 Explanation: Prokaryotic cells differ from eukaryotic cells in that they lack any membrane-bound organelles, including a nucleus. Instead, prokaryotic cells simply have an outer plasma membrane, DNA nucleoid structure, and ribosomes.
What are the main function of ribosomes?
Ribosomes have two main functions — decoding the message and the formation of peptide bonds. These two activities reside in two large ribonucleoprotein particles (RNPs) of unequal size, the ribosomal subunits. Each subunit is made of one or more ribosomal RNAs (rRNAs) and many ribosomal proteins (r-proteins).
What is the structure and function of ribosomes?
Ribosomes are a cell structure that makes protein. Protein is needed for many cell functions such as repairing damage or directing chemical processes. Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum.