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3 years ago

Question 14

Biology

1 answer:

Flauer [41]3 years ago

6 0

Answer:

Question 13 - c. exons

Question 14 - c. introns

Explanation:

Its me again the person that made the question. I know the answer. I did it and got a 77.7%

I didn't get a good score. But I moved on to Mandatory 2 Step.

The answer I put on all my questions are the answers I used to get a 77.7%

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For this assignment you will complete an illustration(s) (by hand) of how the lac operon works. You should be sure to include de

Fantom [35]

<h2>Lac operon </h2>

Explanation:

Lac operon present in prokaryotic chromosomes whose product involves in transportation and catabolism of lactose

Lac operon consists of three structural genes called Lac Z,Lac Y and Lac A and a regulatory element(promoter and operator)
Lac I gene is present outside the Lac operon,act as regulatory gene and control the expression of Lac operon genes
Lac Z codes for β galactosidase which converts lactose into allolactose
Lac Y codes for Lac permease which act as a membrane transporter and transport lactose into the cells
Lac A codes for transacetylase which neutralize the toxic effects of lactose

Lac operon in absence of lactose

In absence of lactose Lac operon exists in switch off state
Lac I gene produces Lac repressor which binds to operator region and prevent binding of RNA Polymerase thus blocks transcription

Lac operon in presence of lactose

In presence of lactose Lac operon exists in switch on state
In presence of lactose few molecules of Lac operon enzyme catalyse conversion of lactose to allolactose
Allolactose act as an inducer,binds to the Lac repressor and induce conformational changes causing dissociation of Lac repressor from operator
In absence of Lac repressor RNA Polymerase binds to the promoter and starts transcription of genes which catabolize lactose

Lac promoter is a weak promoter and direct transcription of Lac operon genes in very low level in presence of lactose

For higher level expression of Lac operon genes,operon system require conversion of weak promoter to strong promoter which is always mediated by catabolite protein-cAMP complex(CAP-cAMP complex)
CAP cAMP complex binds to the upstream of promoter called CAP binding site and stimulate expression of Lac operon genes by facilitating binding of RNA Polymerase
Catabolite activator protein(CAP) or cAMP receptor protein(CRP) activate when cAMP binds
cAMP is a secondary messenger synthesized from ATP and act as co-activator of CRP
With respect to CAP cAMP complex Lac operon system is positively controlled
In prokaryotic cell cAMP is very low when glucose concentration is relatively high and vice versa
At high concentration of glucose the growth rate is maximum and lactose catabolism is repressed called catabolite repression

6 0

3 years ago

Which two factors could lead to the evolution of a species over time?

Galina-37 [17]

Answer:

2) Evolution is the result of mutations and recombination, only. 3) Organisms best adapted to a changed environment are more likely to reproduce and pass their genes to offspring. 4) Asexual reproduction increases the survival of species.

Explanation:

7 0

4 years ago

Read 2 more answers

In the previous question, you used the Hardy-Weinberg equation to determine the frequencies of the genotypes for HH, Hh, and hh,

Oxana [17]

The expected number of each organism in the population is HH = 60, Hh = 48, hh = 96.

<h3>What is the Hardy-Weinberg equation?</h3>

The hardy-Weinberg equation is a mathematical equation used to calculate the genetic variation of a population at equilibrium.

The given frequencies are HH = 0.04

Hh = 0.32

hh = 0.64

So, the percentages are HH = 4%, Hh = 32%, hh = 64%.

The total percentage will be (4 + 32 + 64 = 100)

The total size is 150

Now,

The number of HH genotype is 0.4 × 150 = 60

The number of Hh genotype is 0.32 × 150 = 48

The number of hh genotype is 0.64 × 150 = 96

The total is 6 + 48 + 96 = 150

Thus, the expected number of each organism in the population is HH = 60, Hh = 48, hh = 96.

Learn more about Hardy-Weinberg equation

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3 years ago

Nitric oxide (no) participates in a signal transduction pathway that promotes relaxation of smooth muscle cells lining blood ves

timurjin [86]

Nitric oxide accomplishes this by elevating cGMP levels.

NO is a distinctive message. It is a gas, although it does dissolve in an aqueous solution.
It is a free radical with an unshared electron, which will react with thiol groups on proteins to form new complexes.
Unlike other second messengers, NO doesn't need energy to move inside and outside of cells. It can go where it wants, but it does not travel far because it is a reactive free radical.
NO acts within the cell that produces it as a second messenger. It operates as a paracrine molecule able to travel 10–20 cell diameters to affect the biology in surrounding cells. It can form complexes with proteins like hemoglobin, glutathione, and other proteins and then separate from those complexes.

Therefore, increasing cGMP levels is necessary.

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3 0

2 years ago

part of an important cellular process involving a DNA strand is modeled below. What is the purpose of the cellular process ?

creativ13 [48]

<u>Cellular respiration</u> is the process by which cells in plants and animals break down sugar and turn it into energy, which is then used to perform work at the cellular level.

Explanation: In simpler words, it provides energy for the cell to do basic needs.

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3 years ago