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Evgesh-ka [11]
3 years ago
6

Oxidative damage to DNA can often result in the alteration of a single nucleotide.

Biology
2 answers:
Harman [31]3 years ago
5 0

Answer:

Repair mechanism for base cleavage (BER)

Explanation:

Repair by base cleavage (BER)

The altered bases are specifically recognized by glycosylases and removed, generating an AP site. The hole is filled by a DNA polymerase that takes the healthy strand as a template. This system arises not only by exposure to external agents, but also by the cell's own activity.

In case of damage in more than one nucleotide, repair by nucleotide excision (NER) is performed.

Nucleotide excision repair (NER)

The damaged area is recognized by UvrA and B, then A and B separate and UvrC enters which forms a complex with endonuclease activity with B. This enzyme cuts the T-dimer and the gap is filled by a DNA polymerase. There is also the TC-NER system (transcription-coupled nucleotide repair system). The alteration of these mechanisms gives rise to diseases such as: Xeroderma pigmentosum, Trichotiodystrophy or Cockayne Syndrome

Sergio039 [100]3 years ago
5 0

Answer:

Base Excision Repair

Explanation:

It is a field of biochemistry and genetics which deals with the repair of damaged DNA all through the cell cycle. Its main function is to remove small, non-helix-distorting base lesions away from the genome.

It prevents mutations from being incorporated into the DNA while it is being copied.

It is initiated by the enzyme DNA glycosylases (it helps pinpoint and exclude destroyed or mismatched nucleobases, allowing for recovering of the basic DNA sequence by follow-on BER enzymes).

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In an ecosystem, why can only one species fill an ecological niche? (Site 1)
Anastaziya [24]

Answer:

Only one species can fill an ecological niche because each niche is destined exclusively for each species, since its structure, physiology and behavior determine it.

Explanation:

An ecological niche is the way in which each species relates to its environment, to other species and takes advantage of the resources available for its development, being an exclusive and individual characteristic of that species.

The ecological niche is a concept that many consider abstract, since it is unique for a species. Each species has a physical structure, functioning and behavior that differentiates it from the others, which leads it to occupy a certain place within an ecosystem, which would be its ecological niche.

Learn more:

Ecological niche brainly.com/question/718384

6 0
3 years ago
A patient comes to you with a "PUS" sample and asks you to isolate & identify the Staphylococcus aureus form this sample the
Irina-Kira [14]

Answer: Staphylococcus aureus can be isolated from the pus sample through the following steps:

--> Step 1: Describe the appearance of the specimen

--> Step 2: Examine the specimen microscopically

--> Step 3: Culture and report your observations.

--> Step 4: Biochemical testing

Explanation: Staphylococcus aureus are gram positive cocci bacteria that can be isolated from pus samples.Pus samples, which may come from wounds, abscess, burns or sinuses, are the type of samples which do not contain microorganisms and should not contain contaminants providing an aseptic collection technique and sterile container are used.

Staphylococcus aureus can be isolated from the pus sample through the following steps:

--> Step 1: White, yellow, brown, red, or black granules of varying size, shape, and consistency may be found in pus draining from

sinuses while describing the appearance of the pus sample.

--> Step 2: Here the specimen is examined microscopically after being stained with a staining technique called Gram staining. This step is done before culture to know the type of medium to use after gram positive cocci is microscopically seen.

--> Step 3: there are different cultures media that can be used to inoculate and culture a pus specimen. Since we are to isolate staphylococcus aureus, a selective and differential media known as Mannitol salt agar (MSA) is used. The presence of yellow colonies with yellow zone after incubation at 37°C indicate the presence of Staphylococcus aureus or species. There for the last confirmation test known as biochemical test is done.

--> Biochemical test: This is a chemical test that is done to identify a particular bacteria. For staphylococcus aureus, COAGULASE test is used to identify staphylococcus aureus which produces COAGULASE enzyme. A positive COAGULASE test is an indication of the presence of staphylococcus aureus as the bacterium isolate of the specimen.

7 0
3 years ago
Lions live in the south Sahara Desert in breeding groups called prides. Females tend to stay in their pride, but males may leave
kotykmax [81]

The correct answer to this open question is the following.

Although there are no options attached we can say the following.

This mechanism describes the necessity of males to lead and form their own pride to show their dominance and power. That is why young lions leave and wander, and when they are ready, they fight for their right to lead their own pride.

So yes, Females tend to stay in their pride, but males may leave to join another pride. And that is the male instinct for lions in the wildlife.

On the other hand, males tend to stay in the same pride, taking care of their cubs, raising them, and hunting. That is what they do best, hunt animals to feed the pride and the cubs.

7 0
3 years ago
What is the term used for a farmer growing crops but using it for self gain?
Nady [450]

✯Hello✯☆(❁‿❁)☆

↪<u><em>  Subsistence FARMING</em></u>

↪  This is when a farmer doesn't have enough money to survive and buy food

↪  They have to grow crops to eat and make a living for themselves

↪  HOPE THIS HELPS

★ВУёヽ(‘∀`○)ノВУё☆

❤Gianna❤

4 0
3 years ago
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juin [17]

Answer:The Doppler radar used in weather forecasting measures the direction and speed, or velocity, of objects such as drops of precipitation. This is called the Doppler Effect and is used to determine whether movement in the atmosphere is horizontally toward or away from the radar, which aides in weather forecasting.

Explanation:

8 0
3 years ago
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