Which structures should a student bond together to form two strands when building a DNA model? *

A. Ribosomes
B. Phosphates
C. lysosomes
D. Nucleotides

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

What is the next step in the process after a substrate enters the active site of an enzyme

What are 3 reasons that natural selection occurs