POSSIBLE POINTS: 5 The sodium-potassium pump is involved in active transport that moves 3 sodium ions from the cell for every 2 potassium ions it moves into the cell. Which of these best explains why energy is needed for active transport? lons are being moved against the concentration gradient. lons are attached to small particles. lons are trapped inside the cell membrane. lons are negatively charged.

the answer would be knowledge about cars!

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.