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Mar 31, 2021 · All cells are surrounded by a cell membrane, which consists of a semipermeable phospholipid bilayer. The cell membrane controls which substances enter and leave the cell, and also separates the interior of the cell from its external environment. Plant Cell Parts And Their Functions
- Kate Latham
Apr 27, 2017 · There are countless different functions that cells must perform to obtain energy and reproduce. Depending on the cell, examples of these functions can include photosynthesis, breaking down sugar, locomotion, copying its own DNA, allowing certain substances to pass through the cell membrane while keeping others out, etc.
Cells are microscopic building blocks of unicellular and multicellular living organisms. Animal, plant, fungal and bacterial cells are different in terms of structure but also have many...
Cell StructureDescriptionFunctionCell TypeCell wallFreely permeable layer surrounding cell ...Supports and strengthens cell?Cell membraneSelectively permeable double layer of ...?All cell types?Fluid enclosed by the cell membrane, ...Location of many chemical reactionsAll cell typesMitochondria?-shaped structures found in ?Location where aerobic respiration occurs ...Animal cell, plant cell or fungal cell- Cell surface membrane. The structure of the cell surface membrane – although the structure looks static the phospholipids and proteins forming the bilayer are constantly in motion.
- Cell wall. The cell wall is freely permeable to most substances (unlike the plasma membrane) Cell walls are formed outside of the cell membrane and offer structural support to cell.
- Nucleus. The nucleus of a cell contains chromatin (a complex of DNA and histone proteins) which is the genetic material of the cell. Present in all eukaryotic cells, the nucleus is relatively large and separated from the cytoplasm by a double membrane (the nuclear envelope) which has many pores.
- Mitochondria. A single mitochondrion is shown – the inner membrane has protein complexes vital for the later stages of aerobic respiration embedded within it.
Signaling is the initial event associated with many key cellular functions, from the correct timing of cell division, to the decision to migrate in a particular direction, and even to whether a cell needs to go through programmed cell death.
Organelles allow for various functions to occur in the cell at the same time. Before discussing the functions of organelles within a eukaryotic cell, let us first examine two important components of the cell: the plasma membrane and the cytoplasm.
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The goal of this tutorial is for you to be able to describe cell theory, differences between prokaryotic and eukaryotic cells and understand cell structure and function.
