Bolide is a large piece os space debris that crashes into a planet

The above statement is true  

Explanation:

Bolides are the pieces of space debris that are commonly considered as the fireballs. They are very bright and similar to the moon and can cause craters due to impact, but they are rarely found. These bolides usually shatter when they enter a planet's atmosphere. The composition of bolide is still unknown, whether it is an asteroid comprised of only rocks or is a metallic asteroid, but it has the capacity to form big craters due to an impact.

These are comparatively smaller asteroids. Every year about 5,000 bolides fall on earth but are not visible because during the day time it is not so visible due to the sunlight.

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.