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evablogger [386]
3 years ago
8

I need help with that

Biology
2 answers:
crimeas [40]3 years ago
5 0
3H2O is the correct answer
goldenfox [79]3 years ago
4 0

Answer:

D. 3H2O

Explanation:

An atom is the smallest unit of matter that has the characteristics of a chemical element. It consists of protons, neutrons, and electrons - small electrically charged particles.

They make up molecules - electrically neutral groups of two or more atoms connected by chemical bonds. Multiple molecules that consist of two or more different atoms make up a chemical compound.

The chemical compound that has nine atoms is 3H2O. Here, we have three molecules of water. Each molecule consists of three atoms - two hydrogen atoms and one oxygen atom. This means that three of these molecules have a total of nine atoms.

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What would happen to a prokaryotic cell if the nucleoid was not there
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Less than .1% of the energy in a food chain generally makes it from the sun to consumers
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3 years ago
In the absence of tryptophan, _____.
GenaCL600 [577]

Answer: A

Explanation:The Trp operon is responsible for synthesis of the amino acid trytophan when it is not available in the cellular environment.

When the tryptophan is plentiful, a repressor protein binds to two molecules of tryptophan.

Thiss repressor-tryptophan complex binds to the trp operator. This binding prevents the binding of RNA polymerase, so the operon is not transcribed, and no new trptophan is produce.

On the other hand, when tryptophan levels are reduced, the inactive repressor will not bind the tryptophan operator so the operon is transcribed.

Regulation of the trp operon is determined by the concentration of tryptophan; when adequate tryptophan is present in the growth medium, there is no need for tryptophan biosynthesis.

Transcription is turned off when a high concentration of tryptophan is present, and is turned on when tryptophan is absent. The regulatory signal is the concentration of tryptophan itself.

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