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Introduction to the cell. Cells are the most basic unit of life. All cells have a membrane that separates them from the outside world. Although cells are small, they are not simple. Cells contain different components, such as the cytoplasm, ribosomes, and genetic information in the form of DNA. Created by Sal Khan.
- 6 min
- Sal Khan
19 de dic. de 2023 · Cell types can look different, and carry out distinct roles within the body. For instance, a sperm cell resembles a tadpole, a female egg cell is spherical, and nerve cells are essentially thin tubes.
En normal cell upprätthåller självständig ämnesomsättning ( metabolism) och cellen innehåller all den ärftliga information som krävs för att bilda en ny identisk cell. I cellens inre finns strukturer som kan betraktas som cellens egna inre organ, organeller. De är lösta i cellvätska, cytosol.
Level up on all the skills in this unit and collect up to 800 Mastery points! Start Unit test. Take your cellular knowledge to the next level! From organelles to membrane transport, this unit covers the facts you need to know about cells - the tiny building blocks of life.
Meiosis has two cycles of cell division, conveniently called Meiosis I and Meiosis II. Meiosis I halves the number of chromosomes and is also when crossing over happens. Meiosis II halves the amount of genetic information in each chromosome of each cell. The end result is four daughter cells called haploid cells.
Explore our Best ofs throughout the years, research topic-based collections updated on a weekly basis, and more. Check out the journal metrics of Cell Reports! Cell Reports ISSN: 2211-1247 (online); 2639-1856 (print) Cell Reports is an open access journal that publishes peer-reviewed papers across the entire life sciences spectrum that report ...
6 de ago. de 2023 · Every cell has a different ‘signature’ or ‘marker’ that is thought to function in cell recognition, or in a sort of cellular identification system. Other cells have additional protective cell layers on top of the cell membrane, e.g. cell wall in plants, algae, fungi, and certain prokaryotes. Figure 1: Plant cell parts diagram.
