Answer:
repressible
Explanation:
When the expression of genes of an operon is reduced or decreased in response to certain signals, the operon is said to be repressible operon. The operon with genes that code for enzymes of biosynthetic pathways is repressible in nature to ensure the expression of the genes only when required.
For example, the genes of tryptophan operon code for the enzymes involved in the biosynthesis of tryptophan. The "tryptophan operon" is not expressed when enough tryptophan supplies are available for the cell. So, tryptophan operon is a repressible operon.
Removes the nucleus from an egg cell and replaces it with the nucleus from another organism
Answer:
B. The random movement of pollen granules suspended in water.
Explanation:
Brownian motion is the irregular movement of particles suspended in a liquid or a gas, and it is usually caused when there is a bombardment of the particles by the molecules in the liquid or gas.
The Brownian motion who was named after Robert Brown, first experimented the random movement of pollen grains in water; therefore the movement of pollen grains or granules suspended in water.
The plates carry the continents which make up the ocean floor, floating like islands on the hot, taffylike rock below.