D. The repressor is freed from the operator when lactose is present.
Think of a bacteria that comes into contact with some lactose sugar in milk. Normally it's not in milk, so the gene is repressed (prevented) from making the lac enzyme (which digests lactose). Now when it comes across some milk, it wants to make as much lac as possible to eat up all the lactose.
FYI: trp for tryptophan works the exact opposite with repressor blocking when trp IS PRESENT.
Answer:
<u>Beach norishment</u> refers to <u>addition of sand on beach</u> to <u>reduce the erosion effect</u> by water currents.
<u>Vegetation management</u> is the <u>(re)plantation</u> of plants to reduce the erosion effect on beaches caused by waves.
Explanation:
In the statements given above, addition of hard structure doesn't primarily means beach nourishment, likewise, vegetation management doesn't replace the sand on beach rather prevent sand erosion. However, vegetation management brings in plants that hold the sand especially on sand dunes. Floods cannot be totally controlled by beach nourishment but with the help of plants, their impact can be minimized.
Answer:
in a container with a lid
Explanation:
the lid would keep it aliveand keep in a refrigator
