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General

Cell Membrane (Plasma Membrane) – Structure, Function and Composition

The cell membrane is a phospholipid bi-layer into which proteins, glycoproteins, and glycolipids are ingrained. The cell membrane is also known as plasma membrane or plasmalemma. This membrane separates the fluid outside the cell called extracellular fluid (ECF) and the fluid inside the cell called intracellular fluid

Cellular Respiration and Its Importance

Cells need a consistent supply of energy to power the chain reaction of life. This energy is straight provided by ATP molecules Due to the fact that cells have a minimal supply, ATP molecules should continuously be produced by cellular respiration in order to sustain life. Cellular

Signal Transduction – Membrane And Lipid-Soluble

Membrane Receptor Signal Transduction Proteins, peptides, and charged molecules do not easily diffuse across the cell membrane. Consequently, the cell membrane can serve as a barrier to cell-to-cell communication when such agents are used as neurotransmitters and hormones. This communication barrier is overcome by use of proteins

Endoplasmic Reticulum – Types and Functions

Endoplasmic reticulum is a network of tubular and microsomal vesicular structures which are adjoined with one another. It is covered by a restricting membrane which is formed by proteins and bilayered lipids. The lumen of endoplasmic reticulum consists of a fluid medium called endoplasmic matrix. The size

DNA Structure and Function

DNA is a long threadlike molecule with a uniform diameter of 2 nm, although its length varies greatly from the smallest to the largest chromosomes. Most human cells have 46 molecules of DNA totaling 2 m in length. This makes the average DNA molecule about 43 mm

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