Cell membrane

Cell Biology Beta cells in pancreatic tissues are described as eukaryotic cells and not prokaryotic, this is because the cell is larger in size and there is a true nucleus present which contains DNA. In prokaryotic cell there isn’t a nucleus and the DNA is free within the cytoplasm. Also Beta cells have many organelles and there is mitochondria present, which in a prokaryotic cell there are fewer organelles and there aren’t any mitochondria present. Beta cells in the pancreatic tissue release…

The nucleolus which is also known as the brain of a cell, is the most significant part in the nucleus. It takes up about 25 percent of the nucleus and it is not surrounded by a membrane. Through a microscope, the nucleolus is a big dot in the middle of it. It can be found in an animal, plant, diploid, and eukaryotic cell. It was found in the eighteenth century but its function wasn’t discovered until the 1960s. The nucleolus lives in the nuclear matrix. Sadly, the nucleolus is one of the…

As the largest organelle, and the first to be discovered [1], the nucleus is the control center of the cell. Given its name by Scottish Botanist, Robert Brown, the nucleus is responsible for all cellular processes in eukaryotic cells and usually fills approximately 10% of the cell's volume [1]. The reason for this organelle's large size is because of the DNA it contains. In fact, each human contains approximately six feet of DNA which is tightly packed and highly organized by proteins, the…

Cells are very important because they are assumed to be the basics of life. There are two types of cells that exist: Prokaryotes and Eukaryotes. The interesting thing is that, even though the prokaryotes seem to be very different from the eukaryotes. For example, humans look very different from the bacteria, but they still do share some characteristics. No matter at which cell you are looking at: bacteria’s`, plants`, animals`, protists`, etc., they all will be bounded by a plasma membrane…

SKIN COLOUR CHART The human skin colour varies from being the darkest of browns to the lightest of hues. The skin colour is a result of pigmentation that is caused due to genetics passed down by the parents. Over the years, skin pigmentation has evolved among human beings, being affected by many substances such as melanin, haemoglobin, dermis among others. There is a correlation between the geographic distribution of UV radiation as well as the result of the skin pigmentation as a whole among…

chromosome is the chromatid. In body cells, most chromosomes are found in pairs that have the same size and structure. These homologous chromosomes carry the same genes, but a pair of them may have different versions of the genes they carry. One chromosome pair is made up of sex chromosomes, which control the development of sexual characteristics. They are called X and Y characteristics in humans. Cells with a pair of every chromosome are called diploid cells. Sex cells are needed to keep…

Research Question What is the effect of surface area on volume ratio over rate of diffusion of pigment regarding the agar cube, measure by percentage volume of diffusion through time? Hypothesis The experiment involves the use of agar cubes. If the cells of these cubes desire a great surface area to volume ratio in order to carry out their needs (exchanging materials with the environment, receiving oxygen, getting rid of waste products), the SA:V ratio will be larger. Consequently, the rate of…

expressions.The use of stem cells prove to be a vital part in the course of Epigenetics.Stem cells are characterized by two traits. They are self-renewal, able to divide into more identical cells and pluripotency, which allow the cells to become any kind of cell such as Erthrocyte or osteoclast.The relationship between epignetics and stem cells paved a pathway to an experiment relating to the relationship between TET, a protein that oxidizes certain kinds of DNA and stems cells and its…

Particles can move. One type of movement is diffusion. Diffusion is when particles move from an area of higher concentration to an area of lower concentration. The particles can move throughout a liquid, an area , or through a semipermeable membrane. Diffusion can be facilitated or non facilitated. When no other factors are involved in diffusion the particles are moving down their concentration gradient so that the amount of particles can be evenly distributed. if proteins or helpers are…

centrioles drawn. This is where meiosis begins and replicates the cell Spindle fibers start to form on the centrioles and chromosome pairs bind together making tetrads. Nuclear membrane starts to dissolve. Nuclear membrane will be drawn in dashed lines. The chromosomes will be homologous pairs with centromere in the center holding the chromosome together and there will be spindle fibers extended from the centrioles. Shows how nuclear membrane is almost dissolved and also the spindle fibers…