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AleksAgata
2 months ago
6

In which order do the necessary enzymes act to repair a thymine dimer by nucleotide excision repair?a) nuclease, dna polymerase,

rna primaseb) helicase, dna polymerase, dna ligasec) dna ligase, nuclease, helicased) dna polymerase, rna polymerase, dna ligasee) nuclease, dna polymerase, dna liga?
Biology
2 answers:
garik1379 [2K]2 months ago
7 0

Answer:

The right choice is b) "helicase, dna polymerase, dna ligase".

Explanation:

The occurrence of thymine dimers is the most prevalent form of DNA damage resulting from UV radiation. Cells possess a repair mechanism known as nucleotide excision repair to rectify this damage. In this process, a helicase unwinds the double-stranded DNA, creating a bubble at the damage site. Once the damaged part is excised, DNA polymerase fills in the gap where DNA is missing, and DNA ligase reconciles the previously separated double-stranded DNA segments.

garik1379 [2K]2 months ago
3 0
To fix a thymine dimer via nucleotide excision repair, the sequence of enzyme activity is Endonuclease, DNA polymerase I, and DNA ligase. Two primary methods exist for repairing thymine dimers; one is photoreactivation, where an enzyme activated by blue light repairs the dimer, thus restoring the proper base pairing. The alternative method is excision repair, involving the uvr system that removes the dimer, with the gap filled by DNA polymerase I's proofreading capability.
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Dan "threw out his back" after lifting heavy furniture and complained of pain radiating down the back of his right leg. Use anat
s2008m [2378]

Answer:

When Dan "threw out his back", the injury occurred in the lumbar area of the spine, impacting the sciatic nerve and resulting in pain that radiates to the back of his right leg. A possible imaging technique for diagnosis is nuclear magnetic resonance imaging.

Explanation:

Physical activities, particularly lifting heavy items, can lead to lower back injuries which may manifest as muscle strain, tears, or damage to intervertebral discs in the lumbar region.

In Dan's situation, lifting furniture may have led to:

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Which imaging technique would you recommend for diagnosing spinal issues?

The most effective imaging method to detect this injury and assess spinal issues is magnetic resonance imaging, as it can visualize both bone and soft tissue structures (such as cartilage and muscle) in the affected region.

X-rays primarily reveal bone structures, useful for diagnosing fractures or structural changes, but lack the ability to show the status of ligaments, intervertebral discs, or muscles.

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2 months ago
How do genetic modification variations likely differ from genetic sexual reproduction?
vlada-n [2515]

The variations caused by genetic modification lead to alterations in the organism's genome. Such changes express traits in ways that differ from the typical. These variations can cause genetic mutations that may be passed down generations.

In the case of sexual reproduction, the organism's genome remains unchanged. Here, only an exchange occurs between the alleles inherited from each parent, and this does not result in mutations.

7 0
2 months ago
Read 2 more answers
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inysia [2303]

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Las fuertes lluvias de la primavera pasada probablemente causaron que el Lago Okeechobee liberara agua con algas azul-verdosas hacia ríos y canales. La espesa capa verde se deslizó sobre embarcaderos, represas y ríos, fluyendo a través de afluentes hacia el océano.

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Bacterias es la respuesta correcta.

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2 months ago
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