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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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Explanation:

1. cell membranes are partialy permeable, only allowing passage to some certain molecules.

2. diffusion is the movement of molecules across partially permeable membrane down concentration gradient.

3. the molecules are too big to pass through partially permeable membrane. the concentration of the molecule might be higher in the cell than in the solution/surroundings.

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3 years ago
What molecule stores and transmits genetic information in all organisms<br><br> B. DNA<br> C.RNA
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Rna would be your asnwer.
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3 years ago
White matter is found in all of the following locations EXCEPT the ________. a) cerebral cortex b) corpus callosum c) corticospi
Eddi Din [679]

Answer:

cerebral cortex

Explanation:

  • The tissue through which the messages are relayed between different areas of the grey matter is termed the white matter.
  • The nerve fibers present in the white matter are surrounded by myelin due to which they appear white and hence, the name.
  • White matter is present in deeper parts of the brain and on the superficial parts of the spinal cord in the central nervous system.
  • White matter under normal conditions is absent from the cerebral cortex.
3 0
3 years ago
The FRAP technique occurs in a series of steps. Select every statement that correctly describes a step in the FRAP procedure.A.
frez [133]

Answer:

The answer is "Option C and Option D"

Explanation:

FRAP is used only for protein motion management.  It travels throughout two dimensions in the plasma membrane. It includes many available-moving or immobile proteins.  This technology uses globally marked fluorescent bleaching products, and also includes the fluorescent proteins, but one particular area is washed.  

Its protein arc changes are detected by fluorescence reappearance. The fluorescence reappears at a certain stage if the protein can move freely. When the proteins aren't able to move quickly, fluorescent dyes are recovered after a little period, and fluorescence would not resurface during that point if the enzyme is immobile.

8 0
3 years ago
Which parts of the nephron does adh act on to regulate water reabsorption?
Mashutka [201]

Distal Convoluted Tubule and Collecting Duct are parts of the nephron does ADH act on to regulate water reabsorption. ADH acts throughs G-protein coupled receptor in order to increase transcription and the insertion of Aquaporin–2 channels for the apical membrane of the CD and DCT cells. Therefore, the permeability of CD and DCT cells to the water increases.

A Distal Convoluted Tubule (DCT) is a short nephron segment, a portion of kidney nephron between Henle or macula densa and the collecting tubule loop. It plays an important role in regulating extracellular fluid volume and electrolyte homeostasis. In DCT, Sodium absorption occurs, which is mediated by the hormone aldosterone.

Learn more about ADH here

brainly.com/question/1552206

#SPJ4

6 0
1 year ago
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