Cell or Plasma Membranes

A porous membrane has openings scattered on its surface of various size and frequency. This means that such membranes allow various substances to pass through. Any molecules that are larger than the membrane's openings will not pass through.

yes

Water crosses via osmosis. glucose via diffusion. Carbon dioxide needs assistance to pass through the membrane so it requires active transport.

The major types of lipids found in plasma membranes are phospholipids, cholesterol, and glycolipids. Phospholipids are the most abundant and form the structural basis of the membrane bilayer, while cholesterol helps maintain membrane fluidity and stability. Glycolipids are located on the outer surface of the membrane and play a role in cell recognition and signaling.

Yes.

While animal cells have only cell membranes, plant cells have both a cell membrane (between the cell wall and cytoplasm) and a cell wall (a cellulose wall that offsets osmotic pressure causing turgor to occur).

In most contexts radiant energy would be assumed to be made up of electromagnetic radiation, such as light. The force carrier for electromagnetic radiation is a massless fundamental particle, the photon.

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An egg cell is good at its job because it contains all the necessary components for fertilization, such as nutrients and organelles. It is also capable of recognizing and interacting with sperm cells to initiate the fertilization process. Additionally, the egg cell has a protective outer layer that helps regulate which sperm can enter and prevents multiple fertilizations.

In engineering a rigid structure is something that is analyzed as if none of the components deform, that is bend, compress or stretch. For example when analyzing a bridge made out of riveted beams to see how much force is on the joints, the assumption is often made that when there's a load on it, it doesn't deform, that is all the beams stay the same length and don't bend. This isn't exactly true in real life, but it's a good enough approximation that the force on the joints can be pretty accurately calculated.

The reason this approximation is used is that it would be extremely difficult to calculate the exact deformations and for things like bridges the margin for error in doing the design is very large. The errors caused by the rigid assumption are much smaller than the margin for safety engineered into the structure.

For designing things like a bungee jumping tower, treating the cord as a rigid structure is probably not a very good idea.

The correct answer is diffusion. Diffusion is the process by which materials enter and leave a cell through the cell membrane.

All cells are surrounded by a semi-permeable cell membrane

There are two types of cells, prokaryotic cells and eukaryotic cells. Prokaryotic cells are cells which do not have a proper nucleus. Bacteria are prokaryotes. Eukaryotic cells are cells which do have a nucleus, surrounded by a nuclear membrane. All plants, animals, fungi and protists have eukaryotic cells. There are many other differences between prokaryotic and eukaryotic cells. For more information see: http://microbiology.suite101.com/article.cfm/prokaryotic_and_eukaryotic_cells http://www.cod.edu/people/faculty/fancher/ProkEuk.htm http://www.life.umd.edu/classroom/bsci424/BSCI223WebSiteFiles/ProkaryoticvsEukaryotic.htm

They have a hydrophilic and hydrophobic region. The hydrophobic regions will face inward in a phospholipid bilayer, and the hydrophilic will face outward. This creates a bilayer that only allows small, nonpolar molecules through. It makes it difficult for larger macromolecules to pass through because the hydrophobic regions will not face the water inside or outside the cell.

During cytokinesis in animal cells, the cytoplasm divides into two daughter cells, following the separation of the duplicated chromosomes during mitosis. A contractile ring composed of actin and myosin filaments forms at the cell's equator and constricts, pinching the cell into two daughter cells. This process ensures that each daughter cell receives an equal amount of cytoplasm and organelles.

Bacteria are unicellular organisms that have a cell wall but do not have a nucleus. They have DNA material that are of two types - plasmids and chromosomal.

Chromosomal DNA have genetic information and the plasmids have extra information that gives the bacteria genetic advantage such as antibiotic resistance. Some bacteria have a whip like flagellum that helps the bacteria to move along.

The cell gets its energy when nutritional components of food are oxidized by the oygen of inspiration in mitochondria.The bonds break and energy is released in the process which is trapped in the energy rich compounds ATP. When the cells need energy a phosphate bond breaks and energy is released for performing particular cellular activity.

Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration. If no other factors are involved, the concentration in the higher region will fall and the concentration in the lower region will rise until the concentration is equal on both sides of the membrane. Diffusion will continue, but on average equal numbers of particles will diffuse in both directions during equal periods of time. This is called a dynamic equilibrium. For a basic introduction to diffusion see: http://www.bbc.co.uk/schools/gcsebitesize/biology/cellprocesses/2diffusionandosmosisrev2.shtml For more detail see: http://www.blobs.org/science/article.php?article=20

One of the most important substances that pass through the cell membrane is oxygen. Oxygen is essential for cellular respiration, which produces energy for the cell. Without oxygen, cells cannot generate energy efficiently and may eventually die.

Membrane, Cytoplasm, Ribosomes, and DNA

Plasma membranes (also called cell membranes) are composed of something called a phospholipid bilayer. This means that there are two layers of phosphate heads and lipid tails sandwiched together so that the phosphate heads face the outside environment and the inside of the cell, and that the lipid tails are in between the walls of phosphate heads. Cell membranes are also studded with proteins, some of which pass through the membrane (integral proteins) and some of which are outside but connected to the membrane (peripheral proteins). In addition to this, glycoproteins (proteins with sugars attached) are sometimes found on the outside of the membrane. For a detailed picture go to related link and scroll down to where it says "The Plasma Membrane".

Some of the proteins found in plasma include albumin, globulins, fibrinogen, and clotting factors. These proteins play important roles in maintaining osmotic pressure, transporting substances, and contributing to the blood clotting process.

According to the fluid mosaic model, our cell membrane is a double membrane of phospho lipid molecules. Proteins are embedded in this layer. Cholesterol is also an important compone of this membrane.

A cell membrane is a thin, flexible barrier that surrounds and protects the interior of a cell. It controls the passage of substances in and out of the cell, allowing nutrients to enter and waste products to exit. The cell membrane is composed of lipids, proteins, and carbohydrates.