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USPshnik [31]
3 years ago
12

A photon of ultraviolet light hits double-stranded dna and creates a covalent cross-link between adjacent thymines in the same s

trand (a thymine dimer). what is likely to happen?
Biology
1 answer:
Veseljchak [2.6K]3 years ago
5 0
<span>A photon of UV light causes mutations in the double-stranded DNA via a photochemical reaction. The product of such photochemical reaction in DNA is a cyclobutane pyrimidine dimer. Dimers may be repaired by mechanisms of photoreactivation or nucleotide excision repair (NER), but if the repair doesn’t occur dimers are mutagenic.
</span> <span>
UV light is absorbed by a double bond in pyrimidine bases (thymine and cytosine in DNA). The bond is opened and UV-modified base can now react with neighbouring molecules. If neighbouring molecule is another pyrimidine base, the UV-modified base forms direct covalent bonds with it. A cyclic ring (cyclobutane), not normally found in DNA, is formed (links the two pyrimidines). Next step is forming a single bond between two carbon atoms on the rings.The product of this reaction is a 6-4 molecule pyrimidine-pyrimidone which is more mutagenic than cyclobutane pyrimidine dimers.</span>
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An object has a kinetic energy of 32 J and a mass of 36 kg, how fast is the object moving?
marin [14]

Answer:

1.33 m/s

Explanation:

The formula for Kinetic Energy is given as:

K.E=\frac{1}{2} mv^{2} \\

Where, m is the mass and v is the velocity of the object. In order to tell how fast is the object moving we need to calculate its velocity.

Re-arranging the above equation and isolating v, we get

2 K.E = mv^{2}\\\\v^{2} = \frac{2 K.E}{m}

Putting values in this equation, we get:

v^{2}=\frac{2 \times 32}{36}\\\\ v^{2}=\frac{16}{9}\\\\ v=\frac{4}{3}\\\\  v=1.33

Thus, the object is moving with a velocity of 1.33 m/s

7 0
2 years ago
Carbohydrate layer on the plasma membrane includes all of the following except:
irinina [24]

Answer:

c) Gives a cell its distinctive characteristics

Explanation:

Carbohydrates perform two main functions in the cell's membrane: <em>they participate in cell recognition and adhesion</em> (cell-cell signaling or cell-pathogen interactions), they also have a structural role as a physical barrier.

Most of the carbohydrates linked to the membrane are in the form of <em>glycoproteins oy glycolipids</em>, these are the molecules that share information and recognize host cells. <em>Glycocalyx </em>is another way we find carbohydrates in the cell membrane, this layer has cell-adhesion molecules that enable cells to adhere to each other.

I hope you find this information useful! Good luck!

4 0
2 years ago
What cells are the Lungs made out of?
lisov135 [29]
The lungs are lined with epithelial cells:)
6 0
3 years ago
Read 2 more answers
How are viruses different from bacteria?
bagirrra123 [75]
A - Viruses cannot survive outside of a host whereas bacteria can.
6 0
2 years ago
Read 2 more answers
Scientists are examining the possible role of a large asteroid in the Cretaceous mass extinction event. A large asteroid strike
QveST [7]

Answer:

Option C

Explanation:

The null hypothesis is the problem statement and alternative hypothesis is counter of the null hypothesis.

Hence, the null hypothesis here is the rate of extinction was neither higher nor lower when there were sudden climatic changes (asteroid strike)

And alternate hypothesis is "the rate of extinction was either higher or lower when there were sudden climatic changes (asteroid strike)"

Hence, option C is correct

8 0
3 years ago
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