Microbiology Quiz on Viruses and Microbes
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Questions and Answers

The study of microorganisms is called ______.

microbiology

Archaea are very ancient prokaryotic microbes that commonly live in ______ environments.

extreme

Eubacteria are considered to be more advanced than ______ microbes.

Archaea

Eukaryota includes all life forms with ______ cells.

<p>eukaryotic</p> Signup and view all the answers

Approximately ______ million species have been found and described on Earth.

<p>1.75</p> Signup and view all the answers

Viruses have no ______ structure, unlike other organisms.

<p>cellular</p> Signup and view all the answers

Viruses spend their life cycle inside a living ______.

<p>host</p> Signup and view all the answers

Viruses are composed of particles, not ______.

<p>cells</p> Signup and view all the answers

No nutrition, respiration, or ______ activities have been discovered in viruses.

<p>metabolic</p> Signup and view all the answers

The ability of viruses to multiply depends on their presence inside other living ______.

<p>organisms</p> Signup and view all the answers

Viruses share similar chemical compositions to many living organisms, including genes and ______.

<p>plastids</p> Signup and view all the answers

Every virus possesses its own unique ______ and phenotype.

<p>genotype</p> Signup and view all the answers

Viruses can undergo mutations and are susceptible to ______ in a manner like other living organisms.

<p>shocks</p> Signup and view all the answers

Viruses infect cells, causing specific ______ that can reappear when introduced to healthy organisms.

<p>symptoms</p> Signup and view all the answers

Viruses have the ability to catalyze production of ______ compounds within host cells.

<p>chemical</p> Signup and view all the answers

Cells can be classified into two major branches: ______ and Eukaryotic.

<p>Prokaryotic</p> Signup and view all the answers

______ is a category under Prokaryotic cells.

<p>Bacteria</p> Signup and view all the answers

Eukaryotic cells include categories such as ______ and Animals.

<p>Plants</p> Signup and view all the answers

A type of capsule found in bacteria is called a ______ or microcapsule.

<p>glycocalyx</p> Signup and view all the answers

______ is a category that falls under Eukaryotic cells and includes mushrooms.

<p>Fungi</p> Signup and view all the answers

The highest level of classification in the diagram is ______.

<p>CELL</p> Signup and view all the answers

Capsules help cells stick to ______.

<p>surfaces</p> Signup and view all the answers

Capsules protect bacterial cells from engulfment by predatory protozoa or white blood cells, also known as ______.

<p>phagocytes</p> Signup and view all the answers

Capsules are generally made up of ______; sometimes, they also contain amino sugars or peptides.

<p>polysaccharides</p> Signup and view all the answers

Capsules protect certain soil bacteria cells from the harmful effects of drying or ______.

<p>desiccation</p> Signup and view all the answers

The Gram-negative bacterial cell wall is relatively ______, about 10 nanometers thick.

<p>thin</p> Signup and view all the answers

The cell wall of Gram-negative bacteria is composed of a single layer of ______.

<p>peptidoglycan</p> Signup and view all the answers

The outer membrane of Gram-negative bacteria contains a unique component called ______.

<p>lipopolysaccharide</p> Signup and view all the answers

The outer membrane is a ______ structure.

<p>membranous</p> Signup and view all the answers

LPS is also known as ______.

<p>endotoxin</p> Signup and view all the answers

The bacterial cell wall is a unique type of ______.

<p>peptidoglycan</p> Signup and view all the answers

Peptidoglycan is a polymer of sugar (glycan) linked by short chains of ______.

<p>amino acids</p> Signup and view all the answers

The bacterial cell wall provides strength and ______ to the cell.

<p>rigidity</p> Signup and view all the answers

All bacterial peptidoglycans contain ______, which is a definitive component of murein.

<p>N-acetylmuramic acid</p> Signup and view all the answers

The bacterial cell wall is permeable to various ______.

<p>molecules</p> Signup and view all the answers

The cell wall provides strength and rigidity to the cell and is permeable to ______.

<p>solutes</p> Signup and view all the answers

Bacterial murein is a unique type of ______, which is a polymer of sugars and glycans.

<p>peptidoglycan</p> Signup and view all the answers

Capsules are generally composed of ______; rarely they contain amino sugars or peptides.

<p>polysaccharides</p> Signup and view all the answers

A type of capsule found in bacteria is called a glycocalyx or ______.

<p>microcapsule</p> Signup and view all the answers

Capsules protect bacterial cells from engulfment by predatory protozoa or white blood cells known as ______.

<p>phagocytes</p> Signup and view all the answers

Gram-positive bacteria have a cell wall that is ______ thick, ranging from 15 to 80 nanometers.

<p>thick</p> Signup and view all the answers

In Gram-negative bacteria, the cell wall contains a unique component called ______, which is toxic to animals.

<p>lipopolysaccharide</p> Signup and view all the answers

The glycan backbone of peptidoglycan in Gram-negative bacteria is made up of alternating molecules of N-acetylglucosamine (G) and ______.

<p>N-acetylmuramic acid (M)</p> Signup and view all the answers

Gram-positive bacteria have a cell wall that is ______, consisting of several layers of peptidoglycan.

<p>thick</p> Signup and view all the answers

The glycan backbone of peptidoglycan is made up of alternating molecules of N-acetylglucosamine (G) and ______.

<p>N-acetylmuramic acid</p> Signup and view all the answers

Gram-negative bacteria have a cell wall composed of a ______ layer of peptidoglycan.

<p>single</p> Signup and view all the answers

In Gram-negative bacteria, the outer membrane contains a toxic component known as ______.

<p>lipopolysaccharide (LPS)</p> Signup and view all the answers

Teichoic acids run perpendicular to the peptidoglycan sheets in the cell wall of ______ bacteria.

<p>Gram-positive</p> Signup and view all the answers

Teichoic acids, which are unique to Gram-positive bacteria, run ______ to the peptidoglycan sheets.

<p>perpendicular</p> Signup and view all the answers

The cell wall of Gram-negative bacteria is composed of a ______ layer of peptidoglycan surrounded by an outer membrane.

<p>single</p> Signup and view all the answers

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