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My name is Ann [436]
3 years ago
14

Snails and shell fish are grouped as

Biology
2 answers:
Tanzania [10]3 years ago
8 0
Molluscs. hope this helps!
meriva3 years ago
5 0
Crustaceans and molluscus
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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
Match each term to its best definition
velikii [3]

Explanation:

Reef : a ridge of jagged rock, coral, or sand just above or below the surface of the sea.

Area of desposition: is the geological process in which sediments, soil and rocks are added to a landform or land mass.

Sand dunes: is a mount, hill or ridge of sand that lies behind the part of the beach affected by tides.

Continental deposit of

gravel and sand: ???????????

Alluvial fan: a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment

Sand mounds in a desert: is called "sand dunes". A sand dune can be described as a "small mound or ridge" of hill formed out of sand.

Sedimentary dispositional environment : describes the combination of physical, chemical and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record.

Shoreline deposit of sediments: The coastal environment consists of constantly changing conditions, caused by the forces of wind, waves, currents and tides.

Beach sand:Sand is a loose granular material blanketing the beaches, riverbeds and deserts of the world.

Calcareous skeletons from organisms build this wave-resistant structure: Modern coral reefs are principally made of calcium carbonate that has been derived from coral skeletons and cemented into a wave-resistant structure by coralline algae

7 0
3 years ago
Which of the following statements is true?
Dennis_Churaev [7]

That would be. All of the above.

5 0
3 years ago
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How do Viruses Replicate and kill their host cell?
umka2103 [35]

Answer:

nono

Explanation:

hoho

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What are the five main processes of fossilization
kogti [31]

Answer :

Fossilization can occur in many ways. Most fossils are preserved in one of five processes : preserved remains, permineralization, molds and casts, replacement, and compression.

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