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Alina [70]
3 years ago
7

A researcher heats a solution of DNA and notices that as the temperature increases, the absorbance of ultraviolet light at 260 n

m increases dramatically. This is because __________.
Biology
1 answer:
VARVARA [1.3K]3 years ago
5 0

The question is incomplete as it does not have the options which are:

  1. there are more base pairs synthesized
  2. the DNA becomes supercoiled
  3. the double strands of DNA are separating
  4. DNA gyrase relaxes supercoiling of the DNA

Answer:

3. the double strands of DNA are separating

Explanation:

Ultraviolet light is absorbed by the DNA molecule therefore the UV light is used to find the DNA concentration of a sample.

The ultraviolet light is absorbed by the nitrogenous bases present between the sugar-phosphate backbone of the DNA molecule. The part of the base which absorbs the UV light is the presence of the heterocyclic rings.

Since these heterocyclic rings are involved in the hydrogen bond therefore when DNA exists in its double-stranded form, it absorbs less UV light.

When the DNA sample is heated then the DNA gets denatured and DNA becomes single-stranded. The heterocyclic rings absorb the UV light more easily thus increasing the absorbance.

Thus, Option-3 is correct.

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Adenine pairs with thymine (or uracil), and guanine pairs with cytosine.
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Explanation:

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A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/seconds. What is it’s waveleng
dalvyx [7]

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
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The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,
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Read more on Brainly.com - brainly.com/question/1553993#readmore
5 0
3 years ago
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RoseWind [281]

Answer: (The question is incomplete) The human body is made up of different organs. An organ is a group of tissues in a living organism that have been adapted to perform a specific function. The different organs in the body can work together to perform a similar function. These groups of organs performing a common function constitutes an organ system. For example, the circulatory system which is responsible for transporting blood throughout the body, consists of the heart and blood vessels known as veins, arteries and capillaries.

Explanation:

The hypothalamus which is part of the endocrine system organ synthesizes and <em>secretes regulatory hormones.</em>

The skeleton which is part of the Skeletal system <em>supports Body and Anchors Muscle.</em>

The blood which is part of the Circulatory (cardiovascular) system transports <em>substances throughout the body including the heart. </em>

The respiratory system exchanges Oxygen and CO₂ between body and air.

The Muscular system is an organ system consisting of muscles which <em>permits movement of the body.</em>

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The lymphatic system functions to keep body fluid levels in balance and to defend the body against infections. <em>It includes thymus and spleen.</em>

The excretory system <em>rids body of liquid waste</em>. It includes the skin, the kidney and urethra, the bladder, and two ureters.

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The nervous system <em>processes sensory information and controls responses. It includes the brain & spinal cord which form a part of the nervous system called the central nervous system </em><em>(CNS)</em>

3 0
3 years ago
Which property factor determines whether the Sun is classified as a giant star or a supergiant star?
kozerog [31]

Answer: the sun is a giant star,

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