RNA: Structure Like DNA, the nucleic acid RNA (ribonucleic acid) is a?polynucleotide?– it is made up of?many nucleotides?linked together in a chain Like DNA, RNA nucleotides contain the nitrogenous...
DNA: Structure The nucleic acid DNA is a?polynucleotide?– it is made up of?many nucleotides?bonded together in a?long chain DNA nucleotide DNA molecules are made up of?two polynucleotide str...
Mononucleotides: Structure Both DNA and RNA are?polymers?that are made up of?many repeating units?called?nucleotides Each nucleotide is formed from: A?pentose sugar?(a sugar with 5 carbon atoms) A ...
社會捐贈作為美國大學重要的資金來源之一，是學校提供高質量教學、研究和服務的基本保證！ 近日，UIUC官宣他們已提前達成了“計劃在5年時間內實現22.5億美元慈善籌款”計劃，僅僅用了四年，伊大就累計籌得款項27億...
Osmosis All cells are surrounded by a cell surface membrane which is?partially permeable Water can move in and out of cells across the cell surface membrane by a process called?osmosis Osmosis is t...
Active Transport Active transport is the?movement of molecules and ions through a cell membrane from a region of lower concentration to a region of higher concentration Active transport?requires en...
Diffusion & Facilitated Diffusion Diffusion is a type of?transport?that can occur?across a cell membrane Note that diffusion can also happen within a cellular compartment; the presence of a mem...
Practical: Investigating Membrane Structure & Permeability The?permeability?of?cell membranes?is affected by several?factors?such as Temperature pH The effect of such factors on membrane struct...
Cell Membranes Membranes?are vital structures found in all cells The?cell surface membrane?creates an enclosed space separating the internal cell environment from the external environment, and?intr...
The Mammalian Lung: Structure & Function The?lungs?of air-breathing animals provide an ideal exchange surface for the diffusion of gases The lungs are located in the?thorax, or?chest cavity Som...
Fick's Law of Diffusion Fick's Law relates the rate of diffusion to the concentration gradient, the diffusion distance and the surface area This relationship can be represented by the following equ...
Properties of Gas Exchange Surfaces All organisms need to?exchange gases with their environment,?e.g. Aerobic?respiration?requires oxygen and produces carbon dioxide as a waste product Photosynthes...
