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.
When limiting factors increase, diversity in populations decreases. In this sense "limiting factors" can be anything from a lack of resources to a lack of food, meaning it's harder for the population to survive.
Explanation:
Biologists have discovered that the reason behind the decline of fireflies is habitat loss, light pollution and excessive light; excessive light can disrupt the insects mating ritual.
C. Both types of reproduction enable genetic information to be passed from parent to offspring.
It doesn't matter if the reproduction is sexual or asexual, because the offspring has the parent(s) dna and genetics either way.
Answer:
The correct answer is - a lunar eclipse (total lunar eclipse).
Explanation:
When the sun and moon align opposite one another and earth between them and blocks the light of the sun to reach the moon known as a lunar eclipse. A lunar eclipse can be a partial or total lunar eclipse.
A partial lunar eclipse occurs when a part of the earth covers the moon to get the light or between the sun and the moon. The total lunar eclipse occurs when the whole moon is opposite to the sun and earth between them.
