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Cell membrane - semi-permeable barrier, allowing some substances in but not otherscytoplasm - material in the cell which contains dissolved salts, minerals and organelles. mitochondria - Where respiration...

The cell membrane consists of a phospholipid bilayer. Phospholipids are molecules with a hydrophilic (water loving) tail. And a hydrophobic (water repelling) tail. The cell environme...

The bowman's capsule, Proximal convoluted tuble, loop of Henle (descending and ascending lims), distal convolued tubule and the collecting duct. The descending limb is permeable to water. The ascending li...

The four letters (nucleotides) in our DNA code - ATGC - code for the thousands of different proteins that make up our metabolism and our human body. Proteins are made up of modular building blocks known a...

Double-helix DNA strands are separated by breaking the hydrogen bonds between complementary bases. One strand acts as a template strand which complementary bases bind to (adenine to uracil, thymine to ade...