12) Sickle -cell disease is a genetic disorder that is caused by a DNA mutation that exchanges one base for another, which changes one amino acid in hemoglobin. What is this type of mutation?
a. Deletion
b. Frameshift
c. Insertion
d. Point

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Environmental science are unconsidered with methods to preserve natural resourcesa. trueb. false

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?