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Describe how phospholipid molecules are oriented in the plasma membrane of a cell?
The plasma membrane and other membranes of a cell are composed mostly of proteins and a type of lipid called phospholipids. A phospholipids molecule is structured with two fatty acids. The two fatty acids at one end (the tail) of the phospholipids are hydrophobic (not attracted to water). The other end (the head) of the molecule includes a phosphate group, which is negatively charged and hydrophilic (attracted to water). Thus, the tail end of a phospholipids is pushed away by water, while the head is attracted to water.
Describe how the diffusion of ions across a cell membrane differs from the diffusion of nonpolar molecules across the cell membrane?
Ions need to be facilitated through a cell membrane because they are passing through a phospholipid bilayer with a hydrophobic interior. Non polar molecules are also hydrophobic, so they can pass through the membrane easily if they are small enough. Ions are polar, so they have a hard time passing through membranes.
What is the term used to describe mRNA formation?
TranslationThis is because information is translated from one language (nucleotides) into another (amino acids).Source: Clinical Anatomy and Physiology - Thomas Colville and Joanna M. Bassert
Describe the first step that may have led toward cellular organization?
the first step is believed to have come from the joining of micro molecules that became dependent on one another to support their individual needs. over time these micro molecules became one. of coarse this is just a beliefe and in no way is it a proven fact. Being religious myself i learn this stuff as they are "theories" and "opinions" but i do not believe they are true.
Name and describe the purpose of the 4 extra embryonic membranes?
The four extra embryonic membranes in mammals are the amnion (protective sac filled with amniotic fluid), chorion (helps form the placenta), allantois (involved in waste elimination and gas exchange), and yolk sac (produces the first blood cells and contains nutrients for the developing embryo). Together, these membranes support and protect the developing embryo/fetus during gestation.
The characteristic that describe the tail of a phospholipid molecule are?
I would describe the characteristics of the tail of a phospholipid molecule would be mosaic of lipid molecules. The process of theses cells are talked and learnt in science.
The characteristics that best describe the tail of a phospholipid molecule are .?
I would describe the characteristics of the tail of a phospholipid molecule would be mosaic of lipid molecules. The process of theses cells are talked and learnt in science.
What is the best way to describe the chemical role of membranes within a cell?
it recognize the foreign and familiar molecules.
He characteristics that best describe the tail of a phospholipid molecule are .?
The most notable characteristic is amphipathicity, meaning it is hydrophilic on one end and hydrophobic on the other. This allows it to form a bilayer, of which cell membranes are made. If a molecule were to cross through the membrane, it would need to diffuse through a hydrophilic region, a hydrophobic region, and another hydrophilic region, which is difficult for most molecules. This is why the phospholipid bilayer is a good way to separate a cell from its environment.
Describe how phospholipid molecules are oriented in the plasma membrane of a cell?
The plasma membrane and other membranes of a cell are composed mostly of proteins and a type of lipid called phospholipids. A phospholipids molecule is structured with two fatty acids. The two fatty acids at one end (the tail) of the phospholipids are hydrophobic (not attracted to water). The other end (the head) of the molecule includes a phosphate group, which is negatively charged and hydrophilic (attracted to water). Thus, the tail end of a phospholipids is pushed away by water, while the head is attracted to water.
What best describe the tail of a phospholipid molecule?
Neutral charge, nonpolar, and hydrophobic.
Describe how the diffusion of ions across a cell membrane differs from the diffusion of nonpolar molecules across the cell membrane?
Ions need to be facilitated through a cell membrane because they are passing through a phospholipid bilayer with a hydrophobic interior. Non polar molecules are also hydrophobic, so they can pass through the membrane easily if they are small enough. Ions are polar, so they have a hard time passing through membranes.
Describe how a solid changes into a liquid and how a liquid changes into gas?
both can be achieved by applying heat and breaking up the formation of the molecules at different levels of applied energy.
Describe the processes that have led to the formation of the soufriere volcanoes?
Describe the processes that have led to the formation of the Soufriere Hills volcano?
What biochemical term is used to describe large numbers of molecules joining together?
Polymerization is the biochemical term used to describe the process of large numbers of molecules joining together to form a polymer. This process is important in various biological and chemical reactions, leading to the formation of complex macromolecules with specific functions.
What is the best way to describe a phospholipid?
A phospholipid is a type of lipid molecule that forms the basis of cell membranes. It consists of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails. This structure allows phospholipids to arrange themselves into a bilayer, with the hydrophobic tails facing inward and the hydrophilic heads facing outward, creating a barrier that separates the internal and external environments of the cell.
What is a fluid mosaic model?
Simply put, the fluid mosaic model is a description of the membrane of a cell. The fluid part refers to the phospholipids of a cell membrane, which, like liquid, flow. The mosaic part refers to proteins embedded in the phospholipid bilayer that act as conduits through which molecules enter and exit the cell.____________The currently accepted model of cell membrane structure, which envisions the membrane as a mosaic of individually inserted protein molecules drifting laterally in a fluid bilayer of phospholipids.Fluid mosaic is a term used to describe the current model of the cell membrane.Cell membranes are basically double layers (bilayers) of molecules called phospholipids. 'Floating' in the phospholipid bilayer are molecules of protein. a mosaic is a structure made up of many different parts. Viewed from above the membrane would look something like a mosaic - a 'sea' of lipid with many 'islands' of protein.The lipid bilayer is not rigid, and the lipid and protein molecules are able to move sideways in the membrane i.e. the membrane is fluid.This model of the cell membrane was proposed by Singer and Nicolson in 1972, and has been supported by many experiments since then.model for cell membrane given by SJ singer and GL Nicholoson
