Which of the following statements best describes a neutron's charge?
1. a neutron has a positive electrical charge.
2. a neutron has no electrical charge.
3. a neutron has a negative electrical charge.
4. it is unknown whether or not a neutron has an electrical charge.

A neutron has no charge

NEUTRAL = NONE

well thats how I remember it anyway

SO ITS NUMBER 2

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.