Cell or Plasma Membranes

The cell membrane controls exchange of materials such as nutrients and waste between cells and their environment. They have other important functions, for example to enable cells to receive hormones.
Cell membrane is not a function of the brain. This is not found in plants.

No, not all cells in transitional epithelium touch the basement membrane. This type of epithelium is designed to stretch and change shape, so the cells may not always be in direct contact with the basement membrane.

No, they don't. Not directly anyway. The proteins are degraded and new ones are built upp from the aminoacids. Don't know it there are any that actually can go through. Perhaps some of the smaller polypeptides

An apical cell is the primary cell located at the tip of a plant shoot or root. It is responsible for the growth and development of the plant by producing new cells through cell division. The apical cell is important for determining the overall shape and structure of the plant.

Cell membranes are characterized by the presence of a phospholipid bilayer, which provides their structure and barrier function. They also contain various proteins that help regulate transport, signalling, and cell recognition processes. Additionally, cell membranes may have cholesterol molecules embedded within the phospholipid bilayer, providing stability and fluidity.

It could be due to underlying vision problems such as a lazy eye or uncorrected refractive errors like nearsightedness or farsightedness. Crossed eyes can also be caused by muscle imbalances or certain medical conditions. It's best to consult with an eye care professional for a proper evaluation and treatment.

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No, not all living things have cells. While all living things are made up of cells, some organisms like viruses are considered living but do not have cells. Instead, viruses are composed of genetic material (DNA or RNA) enclosed in a protein coat.

A plant cell is a type of eukaryotic cell that is found in plants. It has a cell wall made of cellulose, chloroplasts for photosynthesis, and a large central vacuole for storage. Plant cells also contain other organelles such as the nucleus, mitochondria, and endoplasmic reticulum.

Sperm cells are a part of the male reproductive cells. It is used in sexual reproductions. It comes from the testis of a male. Sperm cells are highly specialized. When they are introduced into the vagina of the female by the penis of the male, they swim up the uterus and oviducts. The swimming is a result of the beating of the tail of the sperm cell. If a sperm cell does not survive within 2-9 days it will die inside the female. The sperm has a head which holds the nucleus, a middle piece and a tail to help it swim. It swims to the egg cell and only one sperm cell can go inside the egg. If a sperm cell enters, this makes a baby. Then it travels down to the uterus where the baby will develop and stay soft while it is in the female.

Yes, a cheek cell is an animal cell. Cheek cells are part of the epithelial tissue that lines the inside of the mouth, and they share many characteristics with other animal cells, such as having a nucleus, cytoplasm, and cell membrane.

Yes plants, like all eykaryotes that I know of, have lysosomes. They have just found this out for certain several years ago and perhaps not all plants have lysosomes They also have peroxisomes. Plants have very much the same house keeping problems all eukaryotes have.

skin

Squamous cells are thin, flat cells that look like fish scales, and are found in the tissue that forms the surface of the skin, the lining of the hollow organs of the body, and the lining of the respiratory and digestive tracts.

Vacuoles are an organelle in a cell. They store things like waste and water for a cell. In animal cells thre are multiple smaller vacuoles, but in plants cells, there is often one large vacuole in the center.

The main structure of the plasma membrane is composed of the phospholipid bilayer. The phospholipid bilayer is composed of a spherical hypertonic head & a straight hypotonic tail which is designed to prevent the flow of unauthorized molecules & to maintain control of what enters & exits the cell. In order for a molecule to pass through, it must use one of multiple different methods of molecular transportation. The most common is the use of channel proteins. The molecule will travel through the channel protein based on its size & polarity-polar or non-polar.

Carrier proteins are embedded in the plasma membrane through a process called facilitated diffusion or active transport. These proteins are synthesized in the endoplasmic reticulum, transported to the cell membrane in vesicles, and then inserted into the lipid bilayer through interactions with specific lipids and membrane proteins. The exact mechanism of insertion can vary depending on the structure and function of the carrier protein.

Scientist Robert Hooke discovered cells in 1665. While observing a thin slice of cork under microscope he saw several pores that were separated by walls surrounding each of them. Hooke named them 'cell'. As cork bears dead cells he could not give any description about nucleus or cytoplasm.

The term cell was first coined by Robert Hooke in 1665. However it was Antonie van Leeuwenhoek who saw the first living cells, which he called animalcules, in 1674.

I'm sorry i can't remember his name i think it was Thomas Hooke but I'm not sure. He (or whoever it is) looked at cork and saw the small little boxes. He thought it looked like jail cells so he called them cells.

Nonpolar molecules like lipid-soluble substances (e.g., steroid hormones, oxygen, and carbon dioxide) are most likely to passively diffuse across the plasma membrane by dissolving in the lipid bilayer. This type of diffusion does not require a specific transport protein and can occur directly through the phospholipid bilayer due to the molecules' hydrophobic nature.

How about a fence around a yard? It does the same thing as a plasma membrane, it keeps the things that are supposed to stay in the yard, in the yard. And, it keeps the things that are outside the yard from getting into the yard. Every once in a while it lets a few select things either go in or out.

Db-gp33-specific CD8 T cells are cytotoxic CD8 T-cells which can specifically recognize the gp33 epitope when presented in the context of the mouse MHC class I complex, H-2Db. The gp33 epitope is comprised of the sequence of amino acids in positions 33-41 of the glycoprotein from LCMV (Lymphocytic Choriomeningitis Virus).

The outer boundaries of the sarcomere are defined by the Z-discs or Z-lines, which mark the ends of the sarcomere unit. These Z-discs separate one sarcomere from the next and provide attachment points for actin filaments.