A type of protein that actively transports materials across a plasma membrane that would not otherwise allow this to occur.
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Movement of Molecules Across Cell Membranes
Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of simple diffusion, facilitated diffusion, active transport, osmosis, endocytosis, exocytosis, epithelial transport, or glandular secretion. This tutorial provides elaborate details on each of these mechanisms. Find out how. ..
Cell Structure
A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, and so on. The cellular contents are surrounded by a double layer, cell membrane. These cellular structures and cell junctions are elaborated in this tutorial...
Plant Cells vs. Animal Cells
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell exterior. Although animal cells lack these cell structures, both of them have nucleus, mitochondria, endoplasmic reticulum, etc. Read this tutorial to learn plant cell structures and their roles in plants...
Plant Metabolism
Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photophosphorylation, chemiosmosis, carbon fixing reactions, respiration, are presented in this tutorial...
Protein Activity and Cellular Metabolism
Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, cofactors, or regulators. In this tutorial, you will also know the common metabolic pathways of biomolecules, such as glucose and other carbohydrates, fats, proteins and amino acids, and essential nutrients...
Biological Cell Introduction
It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'miniature machines' known as organelles. Read this tutorial to become familiar with the different cell structures and their functions...