The terms “run” and “tumble” are generally associated with
a) cell membrane synthesis.
b) taxic movements of the cell.
c) cell wall fluidity.
d) clustering properties of certain rod-shaped bacteria.

The right answer is B.

Taxis, is the phenomenon by which cells are attracted or repelled according to their environment.

It can be attraction and repellence. Finding food (eg glucose) while heading to its highest concentration is very important for bacteria, as well as avoiding harmful agents (such as phenol).

The terms "run" and "tumble" are used in chemotaxis with respect to the movement of cells in a container with a capillary tube containing an attracting or repelling agents.

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.

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?