Oocytes of certain amphibians’ posses’ three million ribosomes per cell and the same is stored for the future use. All living cells contain ribosomes, tiny organelles composed of approximately 60 percent ribosomal RNA (rRNA) and 40 percent protein.However, though they are generally described as organelles, it is important to note that ribosomes are not bound by a membrane and are much smaller than other organelles. Ribosomes occur both as free particles in prokaryotic and eukaryotic cells and as particles attached to the membranes of the endoplasmic reticulum in eukaryotic cells. DNA is found in all cells (well, all I know of), so that's not the correct answer. c. a membrane-bound nucleus. Tight junctions b. Desmosomes c. Gap junctions d. Integral membrane proteins e. Freeze fractures 7. An E.coli cell may contain 15000 to 20000 ribosomes at any given time, but an active eukaryotic cell may have 10-20 times the number of prokaryotic cells. Found within the nucleoplasm, the nucleolus is a condensed region of chromatin where ribosome synthesis occurs. The nucleus contains the cell ‘s DNA and directs the synthesis of ribosomes and proteins. b. ribosomes. Chromatin consists of DNA wrapped around histone proteins and is stored within the nucleoplasm. Ribosomes are required for protein synthesis, so that's not the correct answer either. Ribosomes(rRNA“nanomachines”) are located in the cytosol, some free-floating and some bound to the membrane of the “rough” endoplasmic reticulum(RER, which is what makes that part of the ER look “rough” when viewed in a microscope). In the eukaryotic cell, all the organelles are membrane-bounded but prokaryotic cell possesses organelles that not bound by the membranes. The ribosome is the only organelle found in both prokaryotic and eukaryotic cells. Ribosomes are found in all of the following except A) the Golgi apparatus. C) mitochondria. The ribosomes are found freely inside the cytoplasm of prokaryotes and matrix of plastids and mitochondria of eukaryotes. Ribosome, particle that is present in large numbers in all living cells and serves as the site of protein synthesis. However, the DNA of eukaryotic cells does not float freely in the cytoplasm. Ribosomes can be found attached to the endoplasmic reticulum or free within the cytoplasm. They all have a cell membrane, ribosomes, and DNA as prokaryotic cells do. 70S ribosomes are found both in prokaryotes and eukaryotes. 5. 3. All of the following are types of organelles except, 1. mitochondria 2. cell walls 3. ribosomes 4. vacuoles - 16167826 d. photosynthetic pigments. Instead, it is found in the nucleus, an internal compartment bound by a cell membrane. All of the following are found in all cells except 1) plasma membrane 2) cytoplasm 3) ribosomes 4) mitochondria O5) DNA Get more help from Chegg Get 1:1 help … Ribosomes. Ribosomes are found in almost all organisms except viruses. The nucleus is one kind of organelle found in eukaryotic cells. Thus ribosome is not bounded by the membrane. There are two places where ribosomes commonly exist within a eukaryotic cell: suspended in the cytosol and bound to the endoplasmic reticulum.These ribosomes are called free ribosomes and bound ribosomes respectively. D) the rough endoplasmic reticulum. The small Difference # 70S Ribosomes: 1. 2. B) chloroplasts. In both cases, the ribosomes usually … They are comparatively smaller with a … The electric signal for contraction passes rapidly from one muscle cell to the next by way of a. E) None of the above 6. ttsz/iStock/Getty Images Plus. Cell membranes are what separate the cells from the outside world, so that's not the correct answer. Eukaryotic cells may contain all of the following except: a. flagella. 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