Using today's technology, a spacecraft from earth could travel the distance between in a person's lifetime. a. galaxies b. stars c. planets d. all of the above

Nerve cells are specialized to respond to stimulitrue or false?

What will happen if two of the base pairs of the stand of the dna are switched

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.