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Figure a is an electron micrograph showing a virus on the surface of a bacterial cell. The virus has a large head region, a thick neck and thin spider-like legs attached to the bacterium. Figure b is a drawing that labels the outside of the head as the capsid with the viral genome inside. The neck as the sheath and the legs as tail fibers.
A diagram of a large cell. The outside of the cell is a thin line labeled plasma membrane. A long projection outside of the plasma membrane is labeled flagellum. Shorter projections outside the membrane are labeled cilia. Just under the plasma membrane are lines labeled microtubules and microfilaments. The fluid inside the plasma membrane is labeled cytoplasm. In the cytoplasm are small dots labeled ribosomes. These dots are either floating in the cytoplasm or attached to a webbed membrane labeled rough endoplasmic reticulum. Some regions of the webbed membrane do not have dots; these regions of the membrane are called smooth endoplasmic reticulum. Other structures in the cytoplasm include an oval with a webbed line inside of it; this is labeled the mitochondrion. Spheres in the cytoplasm are labeled peroxisome and lysosome. A pancake stack of membranes is labeled golgi complex. Two short tubes are labeled centrosomes. A large sphere in the cell is labeled nucleus. The outer membrane of this sphere is the nuclear envelope. Holes in the nuclear envelope are called nuclear pores. A smaller sphere in the nucleus is labeled nucleolus.
Table of electron microscopes which use electron beams focused with magnets to produce an image. Magnification: 20 – 100,00× or more. Transmission electron microscopes (TEM) use electron means that pass through a specimen to visual small images; useful to observe small, thin specimens such as tissue sections and subcellular structures. The sample image (Ebola virus) shows a tube shaped into a letter d at one end. Scanning electron microscopes (SEM) use electron beams to visualize surfaces; useful to observe the three-dimensional surface details of specimens. The sample image (Campylobactor jejuni) shows thick three-dimensional spirals.
A diagram of a rod-shaped prokaryotic cell. The thick outer layer is called the capsule, inside of that is a thinner cell wall and inside of that is an even thinner plasma membrane. Inside of the plasma membrane is a fluid called the cytoplasm, little dots called ribosomes, small spheres called inclusions, a small loop of DNA called a plasmid, and a large folded loo of DNA called the nucleoid. Long projections start at the plasma membrane and extend out of the capsule; these are called flagella (singular: flagellum). A shorter projection is labeled pilus. And many very short projections are labeled fimbriae.
A drawing of the plasma membrane. The top of the diagram is labeled outside of cell, the bottom is labeled cytoplasm. Separating these two regions is the membrane which is made of mostly a phospholipid bilayer. Each phospholipid is drawn as a sphere with 2 tails. There are two layers of phospholipids making up the bilayer; each phospholipid layer has the sphere towards the outside of the bilayer and the two tails towards the inside of the bilayer. Embedded within the phospholipid bilayer are a variety of large proteins. Glycolipids have long carbohydrate chains (shown as a chain of hexagons) attached to a single phospholipid; the carbohydrates are always on the outside of the membrane. Glycoproteins have a long carbohydrate chain attached to a protein; the carbohydrates are on the outside of the membrane. The cytoskeleton is shown as a thin layer of line just under the inside of the phospholipid bilayer.
Eggs or gravid proplottidis from an infected individual are passed into the environment; this is the diagnostic stage. Cattle (T. saginata) and pigs (T. solium) become infected by ingesting vegetation contaminated by eggs or gravid proglottids. Oncospheres hatch, penetrating intestinal wall and circulate to musculature. The oncospheres develop into cysticerci in muscles and become infective. Humans are infected by ingesting raw or undercooked infected meat. The scolex attaches to intestine and adults are found in the small intestine.

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About the authors

Senior contributing authors

Nina Parker (Content Lead), Shenandoah University
Dr. Nina Parker received her BS and MS from the University of Michigan, and her PhD in Immunology from Ohio University. She joined Shenandoah University's Department of Biology in 1995 and serves as Associate Professor, teaching general microbiology, medical microbiology, immunology, and epidemiology to biology majors and allied health students. Prior to her academic career, Dr. Parker was trained as a Medical Technologist and received ASCP certification, experiences that drive her ongoing passion for training health professionals and those preparing for clinical laboratory work. Her areas of specialization include infectious disease, immunology, microbial pathogenesis, and medical microbiology. Dr. Parker is also deeply interested in the history of medicine and science, and pursues information about diseases often associated with regional epidemics in Virginia.

Mark Schneegurt (Lead Writer), Wichita State University
Dr. Mark A. Schneegurt is a Professor of Biological Sciences at Wichita State University and maintains joint appointments in Curriculum and Instruction and Biomedical Engineering. Dr. Schneegurt holds degrees from Rensselaer Polytechnic Institute and a Ph.D. from Brown University. He was a postdoctoral fellow at Eli Lilly and has taught and researched at Purdue University and the University of Notre Dame. His research focuses on applied and environmental microbiology, resulting in 70+ scientific publications and 150+ presentations.

Questions & Answers

what is biochemistry
Isaac Reply
Biochemistry, sometimes called biological chemistry, is the study of chemical processes within and relating to living organisms. Biochemical processes give rise to the complexity of life. ... The mechanisms by which cells harness energy from their environment via chemical reactions are known as meta
what is cell
The cell ( latin word cella meaning "small room") is the basic structural ,functional and biological unit of all known organisms. A cell is a smallest unit of life. cell are often called the building block of life
what is pathogenic
kelvin Reply
biological pathogen is anything that can produce disease. a pathogen may also be referred to as an infectious agent, or simple a germ.
explain 3 points why gender is relevant to health.
wat causes sor throat
Ezeama Reply
Gram positive
streptococcus pyrogenes
group A streptococcus pyogenes. But not the only one.
does the bac of s.aures gives choronic diseas in bone?
causes virus bac group A strep allergies smoking
truth also virus
what z microbiology
Mwelwa Reply
microbiology is all about the scientific study of microorganisms, their life changes, their life span, structural punctuality and their phenomenon.
Best scope in microbiology
wat abut skin
whatis scope
what is scope
what happened when someone died and what happened to the blood
Franca Reply
nice question
when you die you have no memory and the blood dry off
what microorganisms is all about?
And how many does the microorganisms is classified?
How are microbs organized
what is endoparasites and exo parasite and their example
Endo : inside the body Exo/ecto : outside or on the body
examples please
Louse for exo/ecto Helminths (worms) for endo
what's prokaryotic
mohaiminul Reply
A prokaryotic cell is a cell with no membrane bounds organelles
what are the main effect of parasite?
yunusa Reply
nutritional group of micro organism
Mana Reply
what are the charateristic bacteria, eukaryotes, and viruses have in commom
Ami Reply
what type of bacteria ismor serious
D N A ar purno rup ki
Ruba Reply
বাংলায় দেখবো DNA এর পূর্রন্যরুপ কি
what's microbiology
micro biology is the study of micro organisms,those being unicellular multicellular or a cellular
deoxyribonucleic acid is a long molecule that contains our unique genetic code.
Does the parasite/parasitology are under microbiology or not
Define bacteria
Bacteria are a type of biological cell & they constitute a large domain of prokaryotic microorganisms.
what kind of microbiology
hello what is main function of T and B cells
Ishaq Reply
T cells are involved in cell-mediated immunity while B cells are primarily responsible for humoral immunity (relating to antibodies)
what is hepatitis B
it's viral infection that attacks the liver and can cause both acute and chronic diseases. the virus is most commonly transmitted from mother to child during birth and delivery, as well as through contact with blood or other body fluids...
What are fundamental experiment of microbiology?
Lucky Reply
study of microscopic organisms, unicellular and multicellular
what are the characteristics of bacteria, viruses, and eukaryotes
bacteria-are living organism. contain a peptidoglycan/lipopolysaccharide cell wall. VIRUS-are considered as organic structure which interact with living organism don't have acell wall. they have many differents like bacteria size -large(1000nm) virus size-smaller(20-400nm). bacteria ribosomes presen
virus ribosomes absence. bacteria living organism. virus b/n living and non-living things
eukaryotic cell has a true membrane bond nucleus and has other membranous organelles that allow for compartmenalization of function
This answer is wrong
Jeffrey Reply
who discovered the growth curve
Joy Reply

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