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MrMuchimi
2 years ago
11

Why isn’t the mitochondria considered to be part of the endomembrane system? Question and answer choices in the attached image.

Biology
1 answer:
Anna007 [38]2 years ago
6 0

The mitochondria isn't considered to be part of the endomembrane system because its structure is not derived from the nuclear envelope, ER, GolgiApparatus, or cell membrane.

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Artificial selection has the greatest impact on society by providing which of the following?
Licemer1 [7]

Answer:

Improved food sources

Explanation:

Artificial selection is also known as selective breeding. Its a deliberate process of breeding plants and animals for better breeds.

It's also called genetic engineering.

This in a way impacts the society positively as crops with better yield are produced. Example is wheat that has more grain or in animals, cow that produces more milk.

6 0
3 years ago
What is the determining factor for the transcription of structural genes of the trp operon?
padilas [110]

The right answer is 3. the availability of tryptophan in the environment

The TRP operon regulation depends on the availability of the tryptophan molecule (it depends if the cell need tryptophan or already has it).

There are two modes of regulation of the trp operon: Suppression and Mitigation

*Repression

The synthesis of operon mRNA is controlled by a repressor that blocks transcription when bound by tryptophan, which acts as a co-repressor.

The repressor, a 108 aa homodimer (ie 2 apo-repressor), has helix-turn-helix domains that interact with inverted repeats at the major groove of the operator, thus allowing its fixation.

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.

* The Attenuation

This is a premature termination of transcription that is a function of Trp concentration. It takes place at a late moment of transcription while regulation by repression is done during the initiation.

1st Case: Low Trp Rate, Continuous Transcription, → Formation of the Anti-attenuator in the absence of trp, and therefore the synthesis of tryptophan is continued.

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.

4 0
2 years ago
How do all multicellular organisms begin? A. as complex organisms B. as a single cell C. by expanding the size of their cells D.
exis [7]
<span>B is the correct answer. Multicellular organisms, as with almost all organisms, begin life as a single cell. The increase in the number of cells can be as a result of cell division or cells combining together. </span>
4 0
2 years ago
Describe how natural selection can affect traits controlled by single genes.
sukhopar [10]
. It can lead to changes in allele frequencies and the evolution oftraits.
6 0
2 years ago
Please i need someone to answer this for me. its urgent!!!!
amid [387]

I also need help on it

7 0
3 years ago
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