WHAT IS TRUE ABOUT CELL PARTICLES PLEAS HEL Particles move against the concentration gradient through the help of a carrier protein.

Particles move only when directed by the cell’s nucleus.

Particles move across the membrane if energy is available.

Particles move from an area of high concentration to low concentration.

D

Explanation:

Particles move from a region of higher concentration to a region of lower concentration until the molecules are evenly contributed

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."