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Genetical Expression

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Genetics

School

Stevens Institute of Technology

Type

Homework

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07Nagbal

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Genetical Expression

Student's Name

Class Name

Professor's Name

Date

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Genetic Expression

Quiz 1

Lactose and glucose play a crucial role in the RNA transcription process. Lactose unavailability

enhances the binding of lac repressor to the operator, thus inhibiting the RNA polymerase

transcription. Also, with lactose's unavailability, the cAMP and glucose levels are low and high,

thus rendering the CAP inactive, reducing the chances of binding to DNA molecules.

On the other hand, the levels of tryptophan regulate the trp operator. With the tryptophan

availability in the environment, the trp repressor blocks the transcription process by attaching

itself to the repressors molecules and changing their shape to render them active.

Quiz 2

The two tryptophan codons are critical in enhancing the translation sequence of the leader

polypeptide sensitivity towards the charged concentration of the tRNA

Trp

. The tryptophan

limitation results in insufficient charging of tRNA

Trp

causing the translation process to pause at

the tryptophan codons.

Quiz 3

Strains #3 and #5 have different phenotypes because diploid bacterium grew to have different I

gene alleles. For strain #3, allele lacl

is inducible, producing negative enzymes in phenotype

inducer absent and positive enzyme in phenotype inducer present. For strain #5, the allele Iacl

always repressed to Iacl

thus producing no enzyme (Griffiths et al., 2000).

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1 Genetical Expression Student's Name Class Name Professor's Name Date 2 Genetic Expression Quiz 1 Lactose and glucose play a crucial role in the RNA transcription process. Lactose unavailability enhances the binding of lac repressor to the operator, thus inhibiting the RNA polymerase transcription. Also, with lactose's unavailability, the cAMP and glucose levels are low and high, thus rendering the CAP inactive, reducing the chances of binding to DNA molecules. On the other hand, the levels of tryptophan regulate the trp operator. With the tryptophan availability in the environment, the trp repressor blocks the transcription process by attaching itself to the repressors molecules and changing their shape to render them active. Quiz 2 The two tryptophan codons are critical in enhancing the translation sequence of the leader polypeptide sensitivity towards the charged concentration of the tRNATrp. The tryptophan limitation results in insufficient charging of tRNATrp, causing the translation process to pause at the tryptophan codons. Quiz 3 Strains #3 and #5 have different phenotypes because diploid bacterium grew to have different I gene alleles. For strain #3, allele lacl+ is inducible, producing negative enzymes in phenotype inducer absent and positive enzyme in phenotype inducer present. For strain #5, the allele Iacl5 is always repressed to Iacl+, thus producing no enzyme (Griffiths et al., 2000). 3 Quiz 4 In cases where both the lactose and the glucose are present, ...
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