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Andrew [12]
1 year ago
6

A number of experiments have demonstrated that areas of the genome that are relatively inert transcriptionally are resistant to

DNase I digestion; however, those areas that are transcriptionally active are DNase I sensitive. Describe how DNase I resistance or sensitivity might indicate transcriptional activity.
Biology
1 answer:
algol [13]1 year ago
6 0

Answer:

The DNA strands are not free in the nucleus, but forming a compact structure called chromatin along special proteins, known as histones. The chromatin structure has an important role in gene expression, as the level of compaction and the histone modification act as signals for the transcription machinery

In order to be transcribed, different areas in the genome need to unfold from the histone proteins, so the RNA polymerase can access the DNA.

That means, <u>that DNA sequences that transcribe at high rate, are more often unfold from the histones, and more exposed to other proteins to bind them. Particularly, those areas are more sensitive to the attack of endonucleases, such as DNAse I.</u>

As a consequence, an assay of DNAse I digestion can be used to identify highly sensitive or resistant to DNAse cleavage areas in the genome, and therefore serve as an insight to which sequences are more and less transcriptionally active.

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bicarbonate ions in blood can absorb hydrogen ions, keeping pH balanced. bicarbonate is acting as a ________  in blood?
Veseljchak [2.6K]
Buffer is an aqueous solution that resists changes in pH when acids or bases are added to it. A buffer solution is typically composed of a weak acid and its conjugate base. There are three major buffer systems that are responsible for regulating blood pH: the bicarbonate buffer system, the phosphate buffer system, and the plasma protein buffer system. Of the three buffer systems, the bicarbonate buffer system is arguably the most important as it is the only one that is coupled to the respiratory system

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5 0
1 year ago
Researchers believe that in a fish species, individuals with the recessive genotype aa are predisposed to disease. Homozygous do
Nataly_w [17]

Answer:

The homozygous dominant phenotype is higher than expected, indicating that evolution has occurred.

Explanation:

At the start there are 200 fishes in the pond, 100 of them are AA(50%) and 100 of them are aa(50%). Using the Hardy-Weinberg Equilibrium equation we can say that the gene frequency is

A=0.5

a=0.5

With those frequency, the expected percentage of offspring with dominant genotype will be:

AA= 0.5 * 0.5 = 0.25 = 25%

The number of homozygous dominant found is 35% which is higher than expected  (25%). Higher homozygous dominant frequency than expected means the Hardy-Weinberg Equilibrium is changed. In this case, evolution probably the cause that shifts the gene frequency.

7 0
1 year ago
7) You decide to clean your bedroom. You notice that your floor is covered with clothes. You decide to try
Strike441 [17]

Answer:

a. Independent Variable: throwing clothes (i.e., the bedroom)

b. Dependent Variable: how clean the floor is

c. Control Variable: throwing clothes into the air

Explanation:

The independent variable is a variable that isn't modified by the other variables measured in the experiment. Conversely, the dependent variable is the variable measured in the experiment which is 'dependent' on the independent variable. Finally, the control variable is a variable that is constant (i.e., unmodified) throughout the course of the experiment.

4 0
1 year ago
Sometimes a suffix functions independently as a medical term. give two examples of suffixes that are also terms, and explain how
aleksandrvk [35]

The answer would be –genesis and –gram. 

Suffixes that have a Greek or Latin roots and that are used to combine with other words or parts of words are not called suffixes, these kind of affixes are called combining forms.


One combing form is –genesis.


As an independent medical term, this means the origin of something in medicine. When a doctor talks about the genesis of a contagion, he or she is speaking of the point of origin of a contagion.


-genesis used as a suffix, can indicate a particular process or pathogen. Example is parthenogenesis.


One combining form is –gram.


As an independent medical term, gram indicated the metric weight of an object as a unit of mass. If nurses talk about how much serving of food, they are talking about it in grams.

-gram signifies something written down. Example is pictogram.

8 0
2 years ago
Imagine that after the birds have been living in the city for many years a second big flock of birds arrives. How will the bird
saul85 [17]

Answer:

Please see below for answer

Explanation:

As the new flock of birds arrives in the city, there will be a sudden surge in the population of these birds. Since there are no predators of the birds around in this city, the population will remain at a higher number as time passes by during the next decade or so.

8 0
1 year ago
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