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Mnenie [13.5K]
3 years ago
8

Provide an explanation as to why bacteria from each location displayed its pattern of growth

Biology
1 answer:
crimeas [40]3 years ago
3 0
The nose, throat, and shoe bacteria grew throughout the FTM tube which means they grow anaerobically regardless of oxygen concentration. The bacteria that grew in the skin FTM tube only grew at the top. This means they are obligate aerobes which grow only in the presence of high oxygen.
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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
3 years ago
A pea plant with purple flowers (and unknown genotype) is crossed with a pea plant with white flowers. one-half of the offspring
Archy [21]
The genotypes of the parents are Aa (heterozygous) and aa (recessive homozygous).  
 For example:  
 If the purple flower is dominant phenotype, then A is a dominant allele for it and Aa is a genotype which will give the purple colour.
In this case, white flower is recessive phenotype with aa genotype.
If we cross Aa x aa
<span>The offspring is going to be Aa Aa aa aa (half purple and half white)</span>
8 0
3 years ago
Give two possible factors that could have an influence on the speed of water uptake by the roots
wariber [46]
Weather conditions such as wind, the path of the flow
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Complete the cycle for ice wedging.
nydimaria [60]
2 is B. Water freezes and 4 is the rock breaks.

7 0
3 years ago
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Herbivores rely on plants for food; however, explain why carnivores also rely on plants?
Aleksandr-060686 [28]
Carnivores also rely on plants because the herbivores are their source of food, and the plants feed the herbivores.
6 0
3 years ago
Read 2 more answers
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