1983-1984 was when it was discovered
If a lot of tryptophan is present, the operon will be repressed.
Under intermediate amounts of tryptophan, the change to stop codons would cause the ribosome to stall and therefore would mimic as if there were no tryptophan present.
If no tryptophan present, the operon would be maximally expressed.
a - True. The ribosome would always be stalled in the leader sequence - so this wouldn't matter. However, the operon would still be transcribed because the repressor would be active (remember Trp operon is controlled both by attenuation and repression). True as long as there's not much tryptophan to activate the repressor!
b- True - With no tryptophan the repressor isn't engaged and the ribosome is stalled in the leader sequence.
c- Matters about how much tryptophan is available. So True if there's lots of tryptophan available.
d- I would choose this one as all of the above could be true depending on the levels of tryptophan.
water table
saturation zone
Explanation:
Water table and saturation zone are two terms from the given choices that are used to identify layers of underground water.
Underground water is also called ground water. They are usually contained in porous and permeable layers within the earth.
- Water table is the uppermost layer below which ground water fills the pores.
- The water table in a place varies with seasons.
- The saturation zone is the zone below the water where the pore spaces are completely filled with water.
lean more:
Biogeochemical cycle brainly.com/question/3509510
#learnwithBrainly
Answer:
c). It builds a camouflaged nest.
Explanation:
It uses coarse matter like branches and bark for the net framework then lined and camouflaged with soft grass, leaves and other material, finally held them together by spider web.
