One of the following is not true about DNA double helix? a, the two dna strands are made up of phosphate group and sugar
b, the bases link the two strands of the DNA​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ ​​​​​ molecule together ​​​
c, in joining the two strands thymine pairs with guanine ​​​​​​​​​​​​​
d, each base, sugar and phosphate ​​​​​​​​​​together from a nucleotide ​​​​​​​

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.

White-tailed deer are considered to be an overpopulated species in the central united states. which of these events probably contributed the most to white-tailed deer exceeding their carrying capacity?

Select the correct answer from each drop-down menu proteins are