B) oxygen
Respiration is defined as the movement of oxygen from the outside air to the cells within tissues
Answer:
in order going from the top to the bottom.
water is compound composed of three atoms
- 1 Hydrogen, 2 oxygens
Cohesive
Because water is a polar molecule it is a good solvent
sweating can have a cooling effect due to evaporation. this is becayse energy is needed to break waters hydrogen bonds.
Frozen water is less dense than liquids water causing ice to float
Explanation:
Acids have a ph of 6 and below whole bases have a ph of 8 and above. If a human has to much acid in their stomach they can take a pill that will lower it back to its normal ph level
Answer:
a
Explanation:
stamen are the male productive organs in a flower where anthers produce pollen grains while pistil is the female productive organs in a flower where the stigma will receive the pollen grains
Answer:
Hemoglobin is responsible for binding and transporting oxygen in the body. It is a tetrameric protein that is found in high concentration in red blood cells (erythrocytes, red blood cells). Each hemoglobin molecule is made up of four subunits: two of the alpha type and two of the beta type, and each subunit can bind an oxygen molecule through its heme group.
Structure studies have shown that hemoglobin can adopt two conformations, called T (tense) and R (relaxed). Deoxyhemoglobin (in blue) is in state T, and the union of oxygen (in red) causes the transition to state R. The animation shows a close view of the heme group (in white, balls and rods) of one of the subunits of hemoglobin. In the deoxygenated state (T), the iron atom is not coplanar with the rest of the heme group due to its association with the histidine side chain. The union of oxygen displaces the iron atom so that it remains coplanar with the rest of the heme group, which in turn drags histidine, producing a larger-scale conformational change that affects the entire protein.
Hemoglobin can be considered as a tetramer formed by two alpha-beta dimers. The conformational change associated with the transition from T to R mainly affects the relative position of these two dimers (rather than the interactions between the alpha and beta subunits within a dimer). This is illustrated in the last stretch of the animation (drawn in black and white).
