The DNA at telomeres is highly repetitive and maintained as heterochromatin. why is it importaint to maintain telomere sequence length on eukaryotes?
The DNA at telomeres is highly repetitive and maintained as heterochromatin. why is it importaint to...
QUESTION 52 Which of the following has/have repetitive DNA sequences in heterochromatin state? (Select all that apply.) A. mitochondria B. telomere C. centromere D. chloroplast
Telomere Length Estimation Objective To estimate the length of telomeres on your extracted gDNA. Background Telomeres are repetitive nucleotide elements at the ends of chromosomes that protect chromosomes from degradation and genetic information loss. Normal diploid cells lose telomeres with each cell cycle. Telomere length, therefore, decreases over time and may predict lifespan. Telomere shortening has negative effects on health conditions and has been linked to many health issues including aging and cancer. Accurate and consistent quantification of telomere length...
A) What are telomeres? B) Are telomeres present in both Prokaryotes and Eukaryotes? C) Explain why some cells have telomeres and others don't (base your explanation on the structure of the DNA molecule and the directionality of polymerases).
Heterochromatin is highly condensed, thus constitutive heterochromatin plays a(n) _____ role and facultative heterochromatin functions in _______ In eukaryotic cells the genomes of ________ and __________ are able to replicate independently of the ______ DNA.
Telomeres Select one: a. consist of repetitive sequences with high G content b. are a few hundred base-pairs long in vertebrates c. have specific proteins bound at the DNA ends d. a and c Hint: it's not a.
An Alu sequence is an example of what? moderately repetitive element Unique sequences that are less frequent than moderately repetitive genes, but more frequent than other unique sequences highly repetitive DNA unique sequence DNA
Explain why telomeres are important by using all of the terms below: -Linear replication -DNA polymerase -Okazaki fragment -Chromosome
Dyskeratosis congenita (DKC) is a rare genetic disorder characterized by abnormal fingernails and skin pigmentation, the formation of white patches on the tongue and cheek, and progressive failure of the bone marrow. An autosomal dominant form of DKC results from mutations in the gene that encodes the RNA component of telomerase. Tom Vulliamy and his colleagues examined 15 families with autosomal dominant DKC (T. Vulliamy et al. 2004, Nature Genetics 36:447-449). They observed that the median age of onset of...
Question 9 1 pts Why does cellular aging (or senescence) occur in eukaryotic organisms? O DNA in eukaryotes is linear, and the ends of the DNA shorten each time replication occurs Telomeres extend the length of the DNA until it becomes too unwieldy to replicate well Extracellular signals tell the cells to stop dividing The nucleotides in the DNA eventually degrade and don't adhere well to each other anymore Question 10 1 pts What evidence do we have against the...
4. A) List the similarities and the differences between DNA replication in prokaryotes and eukaryotes. B) Do prokaryotes have telomeres? Explain why do or why don