The hemoglobin holoenzyme (active enzyme) is a complex of an iron ion and 4 subunits- 2 hemoglobin alpha and two hemoglobin beta. People with sickle cell disease have mutated beta hemoglobins. The mutation is a single nucleotide exchange, that changes the 6th amino acid of protein primary struture - a Glutamic acid into Valine. This one alteration changes the tree dimentional structure of hemoglobin beta so, that it forms lond fibres that disrupt the normal circular form of the red blood cells.
Answer:
implantation – the process by which the zygote attaches to the uterine wall.
<span>which some organisms have learned to harness energy from sources other than the sun, including geothermal energy. That heat energy allows them to form energetic molecules of their own.</span>
the bacteria are provided with regular source of nutrients
Answer:
c. reproductive
Explanation:
an organism can live without the ability to reproduce, and reproductive organs can actually be removed with little affect on an organisms health. we cant live without the other options though.
