Which step happens first in translation? O A. The amino acid pulls apart from tRNA.
✓O B. The ribosome reaches the start codon.
C. The amino acids form peptide bonds.
XOD. A tRNA molecule attaches to a codon.

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.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

What is the volume of a book that has a width of 10 cm a length that is 2 times the width and a height that is half they would remember to express your answer in keeping units