MadSci Network: General Biology
Query:

Re: Do bacteria or mushrooms move?

Date: Sun Dec 6 19:00:13 1998
Posted By: Dean Jacobson, Faculty Biology, Whitworth College
Area of science: General Biology
ID: 912890317.Gb
Message:

  Yes, both bacteria and some fungi move, but they do so in very different 
ways.  Motion can occur either by swimming, sliding, or by cell changing 
shape.  In many fungi you can see rivers of cytoplasm (the jelly-like 
material inside of cells) moving through a long filament of inter-connected 
cells.  This is called cytoplasmic streaming, and is visible under a 
microscope in several types of bread mold.

Bacteria can either swim (some have dozens of flagellae, singular: 
flagellum), propelled by tiny rotating corkscrews, rather like a boat 
propellor.  Others slide by secreting tiny streams of a mucus or slime 
material out through very tiny pores.  Many bacteria do not move at all.

Fungi, such as mushrooms, can grow through the soil from a single spot and 
spread over several acres of land, in essense growing into a gigantic fairy 
ring; (most of their "body" is composed of tiny hairlike threads (ususally 
yellow or white) that can be easly seen in the upper few inches of ground, 
especially in a forest with lots of dead leaves on the ground.  The threads 
themselves do not move from side to side, but they can grow forward by 
dividing and elongating their cells.  One species can actually move 
suddenly:  they form microscopic loops, like wire snares used to trap 
rabbits.  The two or three cells that make up the loop can suddenly swell 
up with water when touched by a tiny worm (called a nematode).  If the worm 
had accidently stuck its head into the loop, it will suddenly become 
hopelessly trapped, and soon gets eaten by threads that grow out from the 
loop cells into the body of the worm.  

Because mushrooms themselves don't move, some attact insects to them by 
smelling like rotten meat or by glowing in the dark.  The insect comes and 
has a meal, eating hundreds of reproductive spores that are then carried to 
new places when the insect flies away.  Pretty clever!
So, many types of bacteria and some fungi do move, but many species do not 
have to actively move at all, provided that they receive a steady supply of 
food (dissolved amino acids or dead leaves, etc.) to replenish what they 
consume.



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