PBIO 1210 Lecture Notes - Lecture 6: Adenine, Energy Carrier, Ribose
54 views2 pages
29 Jan 2018
School
Department
Course
Professor
Document Summary
Fatty acids are non polar and hydrophobic; phosphate groups are polar and hydrophilic (soluble in water) In water, phospholipids assemble in a double layer basic structure of cell membranes. Gases and some small molecules pass easily through membranes. Larger, charged molecules do not image on slide 3. Molecules travel into or out of cells through passageways known as transport proteins. image on slide 4 figure 4. 9 in book. Transport proteins are embedded within the cell membrane, allowing needed materials to move inside cells but restrict entry of harmful or unneeded substances. 50-75% of membranes; known as carrier, channel, or pump proteins. For example, plant root cells use channels that transport ions to obtain minerals such as phosphate from the soil. image on slide 5 figure 5. 14 in book. It consists of sugar (ribose), base (adenine) and three phosphates. It releases energy when the enzyme atpase removes its terminal phosphate group.