Unlike eukaryotic cells, prokaryote cellslack membrane-bound organelles. ... Prokaryotes lack a defined nucleus (which is where DNA and RNA are stored in eukaryotic cells), mitochondria, ER, golgi apparatus, and so on. In addition to the lack of organelles, prokaryotic cells also lack a cytosk...
Why do mitochondria have their own DNA? Why does a retrovirus copy itself into DNA? Why is gene expression regulated in prokaryotic cells? How does the DNA of prokaryotic cells differ from the DNA of eukaryotic cells? Explain how DNA is used to generate proteins in prokaryotic and eukaryotic ...
How many diploid cells do humans have? How genetically close are humans to Hylobates? How many gametes do humans have in their somatic cells? How many chromosomes do penguins have? How do the karyotypes of great apes and humans differ? How many chromosomes does a brain cell have? In a ty...
so before we could get around to the business of existing we needed to get past that problem. The solution: fill our cells with a couple thousand symbiotic bacteria. Literally, they’re not human; mitochondria reproduce on the...
Other organelles found in fungal cells include mitochondria (energy-producing organelles), which vary in size, form, and number; vacuoles, which serve to store water, nutrients, wastes, or enzymes such as nucleases, phosphatases, or proteases; and plastids, which contain pigments and enzymes and ...
1 Consequently, mitochondria are vital for normal tissue function, and mitochondrial defects lead to a myriad of diseases,2,3,4 which vary tremendously in clinical impact, from relatively subtle age-associated defects in single organ systems, to devasting multi-system disorders that are fatal early...
"It doesn't even have lymphocytes. " Such skeptics may be unaware that the mouse is fast becoming as tractable a model organism as the fly, and that humans may... B Beutler - 《Current Topics in Microbiology & Immunology》 被引量: 2发表: 2008年...
Seven yeast Sir-2 homologues have been identified in humans and are designated as SIRT1-7: SIRT1 inhibits p53 response to DNA damage and oxidative stress through the Lys382 deacetylation, SIRT2 deacetylates alpha-tubulin, and SIRT3 is localized to mitochondria. Their roles in human aging ...
RNA can act as: a. protein b. both genes and enzymes c. sugar d. mitochondria In eukaryotic cells, genetic information is found in the form of DNA. Is this true for prokaryotic cells? How are prokaryotes and eukaryotes different in terms of the RNA polymerases involved in transcription?
Why is having mitochondria an evolutionary advantage? Why are colonial organisms not classified as multicellular despite having many cells? Why are some cells not able to always kill themselves using apoptosis and instead have to rely on a white blood cell?