Terms S Flashcards
Saturated Fatty Acid
A fatty acid in which there are no double bonds between carbon atoms
Secondary structure of a protein
Way in which the chain of amino acids of the polypeptides of a protein is folded
Semi conservative replication
The means by which DNA makes exact copies of itself by unwinding the double helix so that each chain acts as a template for the next. The new copies therefore possess one original and one new strand of DNA
Serum
Clear liquid that is left after blood had clotted and the clot has been removed- therefore blood plasma without clotting factors
Sinoatrial node (SAN)
An area of heart muscle in the right atrium that controls and coordinates the contraction of the heart . PACEMAKER
Species
A group of similar organisms that can breed together to produce fertile offspring
Stoma (plural stomata)
A pore mostly found in the lower epidermis of a leaf through which gases diffuse in and out of the leaf
Stroke volume
The volume of blood pumped at each ventricular contraction of the heart
Substrate
A substance that is acted on or used by another substance or process. In microbiology the nutrient medium used to grow microorganisms
Supernatant liquid
The liquid portion of a mixture left at the top of the tube when suspended particles have been separated out at the bottom during CENTRIFUGATION
Symplastic pathway
Route through the cytoplasm and PLASMODESMATA of plant cells by which water and dissolved substances are transported
Systole
The stage in the CARDIAC CYCLE in which the heart muscle contracts it occurs in two stages: atrial systole when the atria contract and ventricular systole when the ventricles contract
