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
miv72 [106K]
4 years ago
9

The ends of the linear chromosomes of eukaryotes cannot be replicated by DNA polymerase. This problem is overcome through the us

e of telomerase, an enzyme implicated in aging and cell lifespan. Telomerase contains a noncoding RNA that acts as a moving template to add a repetitive DNA sequence at the chromosome tip, preventing the loss of essential DNA. In mammals, the ends of the chromosomes fold back to form a circular structure called a T‑loop.
Select the answers that correctly describe telomeres and the actions of telomerase.

a) Telomerase is a specialized reverse transcriptase and its presence within eukaryotic cells indicates that an early eukaryote was infected by a retrovirus.
b) Inappropriate activation of telomerase can result in cellular immortality, one of the cellular changes implicated in the development of cancer.
c) Telomerase activity is turned off in most human cells, causing the telomeres to gradually shorten as the individual ages.
d) The T-loop protects the chromosome ends from degradation by nucleases and double-strand break repair enzymes.
e) Telomerase activity results in a telomere that is completely double-stranded with no single-stranded region that would be susceptible to nucleases.
Biology
1 answer:
IRISSAK [1]4 years ago
3 0

Answer:

Option A, B, C, D and E

Explanation:

The first option indicates an early retroviral colonization of large double-stranded DNA viruses, which are the presumed ancestors of the eukaryotic nucleus; and then inappropriate activation of the telomerase can be implicated in the development of cancer by continous elongation of the telomere length without control.

Its activity can also be turned off leading to continuous shortening during replication and bringing about senesence and aging. the T-loops formed by the activity of the telomerase protects the ends of the chromosomes from being recognized as being broken and degradation.

You might be interested in
Inside a shoe factory, there is a boss that tells the employees how to make different kinds of shoes. There is a door, where the
Galina-37 [17]

Answer:

Mitochondria

Explanation:

8 0
3 years ago
What class does a crocodile belong to?
KatRina [158]
Crocodiles belong to Reptiles. Reptiles are <span>a cold-blooded vertebrates. </span>
5 0
3 years ago
Read 2 more answers
A young man recently learned from a genetics doctor that he had a condition called Friedreich's ataxia. This syndrome affects th
liberstina [14]

Answer: Friedreich ataxia is a genetic condition that affects the nervous system and causes movement problems. People with this condition develop impaired muscle coordination (ataxia) that worsens over time. Other features of this condition include the gradual loss of strength and sensation in the arms and legs; muscle stiffness (spasticity); and impaired speech, hearing, and vision. Individuals with Friedreich ataxia often have a form of heart disease called hypertrophic cardiomyopathy, which enlarges and weakens the heart muscle and can be life-threatening. Some affected individuals develop diabetes or an abnormal curvature of the spine (scoliosis).

Most people with Friedreich ataxia begin to experience the signs and symptoms of the disorder between ages 5 and 15. Poor coordination and balance are often the first noticeable features. Affected individuals typically require the use of a wheelchair about 10 years after signs and symptoms appear.

About 25 percent of people with Friedreich ataxia have an atypical form in which signs and symptoms begin after age 25. Affected individuals who develop Friedreich ataxia between ages 26 and 39 are considered to have late-onset Friedreich ataxia (LOFA). When the signs and symptoms begin after age 40 the condition is called very late-onset Friedreich ataxia (VLOFA). LOFA and VLOFA usually progress more slowly than typical Friedreich ataxia.

8 0
3 years ago
Organisms that contain genes from other organisms are called
Nina [5.8K]
Organisms that contain genes from other organisms are called transgenic. Hope this helps.
6 0
3 years ago
Read 2 more answers
Suppose that two ancient types of plants, one that grows in the winter and one that grows in the summer, appear together in the
Vaselesa [24]

I'm not positive what the answer is but I'm going to use process of elimination to say it isn't pollution or hunting, other than that I'd say it would be climate change, but it could be volcanic eruption.

5 0
3 years ago
Read 2 more answers
Other questions:
  • The gene for alfa globlin and beta globlin are found
    7·2 answers
  • Which kind of front brings rainy or snowy weather that lasts a very long time?
    13·2 answers
  • __________ is the study of body motions as a form of communication.
    12·2 answers
  • During a six-month period, 239 cases of pneumonia occurred in a town of 300 people. A clinical case was defined as fever 39°C la
    6·2 answers
  • What are the common parts of a nucleotide?
    9·1 answer
  • Which tissue is responsible for growth of angiosperms?
    12·1 answer
  • Most domesticated animals have been bred for specific, favorable traits. Dairy cows are bred for maximum milk production while d
    5·1 answer
  • Why was the Battle of Bunker Hill important in the war for American independence from Britain? A. The battle was the first impor
    11·2 answers
  • ples HEL MEEEEEEEAndy learns in school that plants grow best when they receive an optimal range of water, sunlight, and nutrient
    8·1 answer
  • Why is the metric system more scientific than the English system?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!