Oxygen is attached to
a) an iron atom located on the heme portion of hemoglobin
b) an iron atom located on the globin portion of hemoglobin
c) a calcium atom located on the globin portion of hemoglobin
d) a calcium atom located on the heme portion of hemoglobin

surface modification is a versatile tool and has been widely used in material science and engineering that has significantly facilitated the study and characterization of complex materials. at  matexcel, experienced experts in surface science can offer tailored efforts to meet the specific needs from our clients.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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