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ale4655 [162]
3 years ago
9

Please I urgently need help with this

Biology
1 answer:
Paul [167]3 years ago
8 0

Answer:

A - Stigma

B - Anther

C - Filament

D -  Style

E - Ovary

F - Petal

Explanation:

The above are the correct answers of the image drawn in the attachment.

These are parts of a flower.

A - Stigma: It is the head of the pistil. It contains a sticky substance that catches pollen grains from other pollinators.

B - Anther: This is the head of the stamen. It produces pollen grain.

C - Filament: It is a long slender part of the flower. It attaches the anther to the flower.

D -  Style: It actually holds the stigma.

E - Ovary: It holds the ovule. Found at the base of the pistil.

F - Petal: It attracts pollinators to the flower.

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In the absence of trp, the repressor is inactive and does not attach to the operator. The RNA polymerase can bind to the promoter and transcribe the trp E, D, C, B, A structural genes.

In the presence of trp, the repressor changes conformation and becomes active, so it binds to the operator, preventing RNA polymerase from accessing the promoter so transcription will not occur.

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2nd case: High rate of trp, stop transcription, → Formation of the attenuator in the presence of trp. This one will attenuate the synthesis of tryptophan.

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