If oxygen atoms are in low concentration outside of a cell, but the cell requires more oxygen, how will the cell move the oxygen inside the membrane?
a. diffusion
b. osmosis
c. active transport

C) Active transport

Explanation:

Active transport involves the movement of molecules across a membrane from a region of low concentration to a region of high concentration against the concentration gradient. This applies to the oxygen atoms which are in low concentration outside of a cell but requires more oxygen to move inside the membrane.

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:

b a mature ovary of a plant.