1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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.

You might be interested in
hypothesize a mechanism to explain how tissues respond to insulin in different ways, even tisses that have the same amount of re
soldi70 [24.7K]
<span>The major effects of insulin on muscle and adipose tissue are: (1) Carbohydrate metabolism: (a) it increases the rate of glucose transport across the cell membrane, (b) it increases the rate of glycolysis by increasing hexokinase and 6-phosphofructokinase activity, (c) it stimulates the rate of glycogen synthesis and decreases the rate of glycogen breakdown. (2) Lipid metabolism: (a) it decreases the rate of lipolysis in adipose tissue and hence lowers the plasma fatty acid level, (b) it stimulates fatty acid and triacylglycerol synthesis in tissues, (c) it increases the uptake of triglycerides from the blood into adipose tissue and muscle, (d) it decreases the rate of fatty acid oxidation in muscle and liver. (3) Protein metabolism: (a) it increases the rate of transport of some amino acids into tissues, (b) it increases the rate of protein synthesis in muscle, adipose tissue, liver, and other tissues, (c) it decreases the rate of protein degradation in muscle (and perhaps other tissues). These insulin effects serve to encourage the synthesis of carbohydrate, fat and protein, therefore, insulin can be considered to be an anabolic hormone.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

</span>
4 0
3 years ago
Read 2 more answers
Organelles are normally found it?<br>​
PilotLPTM [1.2K]

Answer:

Eukaryotic cells

Hope this helps!

--Applepi101

7 0
3 years ago
In plant cells, what two factors are important in determining the direction of water across the membrane? Why?
Helga [31]

Answer: Generally, these factors are based on two things: hydrostatic pressure and osmotic pressure. Water will only flow across a membrane firstly if the membrane is permeable to water.

Explanation:

6 0
3 years ago
Read 2 more answers
When a cell was examined under a microscope, it was found that it did not have a cell wall . Which of these is likely to be miss
shtirl [24]

Answer:

When a cell was examined under a microscope, it was found that it did not have a cell wall . It has a cell membrane which shows the viewed cell under microscope is an animal cell

Explanation:

Only plant cell has cell wall which gives rigidity and shape to the cell unlike animal cell which has a cell membrane. The cell would comprise of chloroplast, nucleus, golgi apparatus, mitochondria among others

4 0
3 years ago
Where are acids found on the pH scale?
andriy [413]

Answer:

Substances with a pH less then 7 are acids. So they are 0-7

Explanation:

Hope this helps :)

5 0
3 years ago
Other questions:
  • What does a eukaryotic cell have that a prokaryotic cell theory?
    9·2 answers
  • The structure that is in physical contact with the auditory receptor stereocilia is the
    8·1 answer
  • Does voltage from deep brain stimulation damage brain tissue
    14·1 answer
  • Research the group sarcopterygii and explain why all terrestrial vertebrates from cows to humans are included in this group whic
    6·1 answer
  • Write the difference between single celled organisms and multi-cells organisms below.
    14·2 answers
  • Which star is dimmer deneb or mira<br>​
    5·1 answer
  • What are three types of plants or trees found in tundra biomes.
    14·2 answers
  • Explain how scientist might use a Dichotomas key/chart
    9·2 answers
  • MEIOSIS. Questions
    10·2 answers
  • El jugo de un limón se caracteriza por tener un sabor….
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!