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
Harman [31]
4 years ago
10

You try to generate E. coli mutants by inducing pyrimidine dimers through UV exposure to bacteria on Petri plates. You confirm t

he formation of pyrimidine dimers because some cells are unable to replicate or undergo transcription. You find, however, when the plates containing the newly exposed bacteria are incubated in your new warm room (which is a big walk-in incubator), very few mutations are created. You are puzzled by this until you look closely at the large sunny window in your new walk-in incubator and you conclude that:
A. an increase in SOS repair has occurred, which has reduced the number of mutations created.

B. the mismatch repair system has been repressed, and this has caused most of the cells to not survive and not form colonies on the plates.

C. base-excision repair has removed all the pyrimidine dimers from the bacteria so that mutations were not created.

D. nucleotide-excision repair has been repressed, which has allowed enhanced mismatch repair to remove most of the mutations from the DNA.

E. direct repair using photolyase has removed many of the pyrimidine dimers from the DNA in an error-free manner, so there are fewer lesions for SOS repair to process.
Biology
1 answer:
spin [16.1K]4 years ago
5 0

Answer:

The correct answer is option E. "direct repair using photolyase has removed many of the pyrimidine dimers from the DNA in an error-free manner, so there are fewer lesions for SOS repair to process".

Explanation:

Photolyase is a type of enzyme that catalyses DNA repair from damage caused by exposure to ultraviolet light. Photolyase requires activation by exposure visible light, particularly from the violet end of the visible spectrum. If the Petri plates of the bacteria exposed to UV are located in an incubator that is closely at a large sunny windows, it is very likely that the bacteria is performing direct DNA repair using its photolyase enzymes.

You might be interested in
If you cut your skin, would your cells regenerate and heal with meiosis or<br> mitosis?
ololo11 [35]

Answer:

Mitosis I think.

Explanation:

Hope this helps and have a great day!!!

3 0
3 years ago
Read 2 more answers
The primary function of the proximal tubule is
Mashutka [201]

Absorption it regulates the pH of the filtrate by exchanging hydrogen ions in the interstitium for bicarbonate ions in the filtrate; it is also responsible for secreting organic acids, such as creatinine and other bases, into the filtrate.

I hope this helps

7 0
4 years ago
A. True
Sloan [31]
This statement is true. Only active transport can move molecules up a concentration gradient using energy. Passive transport on the other hand, uses no energy and occurs naturally. Therefore molecules can only move a concentration gradient.
5 0
4 years ago
Read 2 more answers
Select the correct answer.
muminat

Answer:

C. when a portion of the moon passes through the earth's umbral shadow.

Explanation:

A partial lunar eclipse occurs when the Earth passes between the sun and moon but the celestial bodies are not arranged in a straight line. When that occurs, a small part of the moon's surface is covered by the darkest, central part of the shadow of the Earth called the umbra. The rest is covered by the outer part of the shadow, termed penumbra.

3 0
3 years ago
How do the strong beak and sharp nail of Eagles help in adaptation​
Greeley [361]

Answer:

Their sharp claws grip.into branches on trees

7 0
3 years ago
Other questions:
  • What is binary fission?
    12·2 answers
  • An owl and a bat share the same kingdom and phylum; an owl and a robin share the same kingdom, phylum, and class. Which of the f
    5·2 answers
  • What is the main function of the lymphatic system
    5·1 answer
  • Solve the riddle: what ends the beggining but starts a new beggining <br> and never ends
    14·2 answers
  • 1. A(n) _____ shows you the schedule of payments on a loan and the total
    7·2 answers
  • Blank 1) one parent
    12·1 answer
  • Explain how the El Niño event affected weather, food production, water supply, or human health. What is a possible solution to r
    13·1 answer
  • Move this lichen
    10·1 answer
  • Why are Mercury Seasons difficult to determine? Explain why.​
    9·1 answer
  • Sulfur oxide is a type of pollution that comes from
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!