The modern electron microscope has been especially valuable in viewing the organelles of the prokaryote cell, such as a bacterial cell. Such cells are only about 1/10 the size of a typical eukaryote cell. Further, they are much simpler in their structural design. Note that the prokaryote bacterial cell lacks a true nucleus. Prokaryote cells appeared “before” (pro-) nuclei had evolved. Instead, the bacterium (bak-TEER-ee-um) holds a central, oval, nucleoid (NEW-klee-oyd) region that is “kernel-like,” but not surrounded by its own individual membrane. The nucleoid region contains a complex collection of coiled DNA molecules. These DNA molecules use RNA molecules to help it direct and control the activities of the other organelles.
Prominent among these are the ribosomes (RYE-buh-sohms) or “5-carbon sugar” (rib) “bodies” (-somes). The ribosomes are tiny black bodies containing the 5-carbon sugar, ribose (RYE-bohs). These black bodies are the main locations for protein synthesis in the bacterial cell.
Like most other cells, the bacterial cell is surrounded by a soft cell membrane (also called plasma membrane). This cell (plasma) membrane encloses the cytoplasm and most other organelles. In addition, however, bacteria have a rigid cell wall, a protective barrier outside the soft cell membrane. Most external of all is the bacterial capsule, a sticky outermost coat that helps glue some types of bacteria firmly to particular surfaces, such as those on human or animal cells.
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About Niyati B., Biology tutor on Chegg Tutors:
Kasturba Medical College, Manipal, India, Class of 2013
Subjects tutored: Health and Medicine, PSAT (reading), PSAT (math), SAT (reading), Biology, Marathi, Medical Assistant, TOEFL, Basic Math, Hindi, English as a Second Language, SAT (math), and Medicine
I have taught concepts of basic math like solving linear equations to my young cousins in California ( grade 6 ) as well as basic human biology like circulatory system. I used to teach English to the children of the house hold helpers back in India and i find that this is what has helped me develop patience and not just that but also helped me brush up on my own knowledge of some things that I never thought I’d use after middle school. Einstein said if you can’t explain it simply then you haven’t understood it well enough and I completely agree. My goal: explain it simply, but also in a way that is hard to forget.
Well in a nutshell I’m a knowledge hungry newbie doctor ( graduated from a medical school in India ) , an avid reader , and I’m also a huge trivia nerd. I have a flair for all things literary ( debate , crosswords , word play you name it ) I absolutely love to read ( mostly fiction , some of my favorite authors like Khaled Hosseini are doctors by profession ) and I have written about 30 poems over the past 10 years. I enjoy listening to podcasts, my favorite one is called Good Job Brain which is a quiz and trivia podcast and I also have a particular fondness for learning about Greek and Roman mythology, and love spoken word poetry. I love to listen to music and sing ( albeit not too well ) and I collect fridge magnets from the places I’ve been. I have spent part of my childhood in the US, and then the rest in India and my life has been transcontinental for the most part which has given me the benefit of some amazing experiences. I also have an artsy side – sketching and painting are some ways I like to unwind, and listening to TED talks is always an option.
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