Wk 2 Prac test

In redis experiment, in which of the following containers did maggots develop

both open and gauze covered container

T/F jan baptista van Helmont proposed that mice could arise from rags and wheat kernels left in an open container for a month

true

what are the basic tenets of the modern cell theory?

• cells are the basic building blocks of organisms

• all cells only come from other cells

which organelles are said to arise from the uptake of bacteria according to the endosymbiotic theory

• mitochondria

• chloroplasts

T/F john snow demonstarted that cholera bacteria were transmitted via food

false

T/F the cause of disease was fully understood after the works of semmelweis and snow

false

T?F barbara was suspected to have pneumonia because of the symptoms she exhibited

true

T/F only bacterial cells contain peptidoglycan in their cell walls

true

which component of the plasma membrane is responsible for cell to cell communication

transmembrane proteins

T/F all cellular life has a DNA genome organized ingo one or more chromosomes

true

T/F endospores are reproductive spores formed by fungi

false

what is the main difference between a vegetative cell and an endospore in terms of metabolic activity

vegetative cells have high metabolic activity; endospores are dormant

deeply branching bacteria are believed to be

very early evolutionary forms of bacteria

the CFB group of bacteria is significant because

it is part of the normal human gut microbiota

which term describes microorganisms that are constantly present in or on our bodies

resident microbiota

rhizobium bacteria are known for

fixing nitrogen

high G+C gram positive bacteria have

more than 50% guanine and cytosine in their DNA

which category of enterobacteriaceae includes escherichia coli?

coliforms

which bacterium is known for causing typhoid fever

salmonella enterica serovar typhi

what characteristic do the genera cytophaga, fusobacterium and bacteroides share?

they are adapted to anaerobic enviornment’s

T/F members of the genus chlamydia are gram positive bacteria

false

the term b-hemolytic in relation to S. pyogenes refers to

the lysis of red blood cells

T/F mycoplasma spp. are included with the low G+C grampositive bacteria despite not being stained by gram stain reagents

true

which lancefield group does S pyogenes belong to?

Group A

which series of bacillus forms chains and appears creamy white on blood agar? also can cause food poisoning in old rice and pasta

b. cereus

which clostridium species is responsible for producing the most lethal biological toxin known?

C. botulinum

acetothermus paucivorans is known for being

a thermophilic bacterium

halobacteria perform photosynthesis using

bacteriorhodopsin

archael cell membranes differ from bacterial cell membranes in that they have:

ether linkages with branched isoprene chains

why did the boiled broth in pasteurs swan neck flasks remain sterile?

the twists and bends of the flasks necks trapped airborne microorganisms

insert figure 3.4

mitochondrial and chloroplast ribosomes are structurally similar to

bacterial ribosomes

T/F john snow demonstarted that cholera bacteria were transmitted via food

false

which physician is associated with the swan neck flask experiments

louis pasteur

t/f wallin succesfully cultured mitochondria outside of their eukaryotic host cells

false

which diseases were identified using koch’s postulates

• tuberculosis

• anthrax

• cholera

what is the major component of bacterial cell walls

peptidoglycan (or murein)

the term bacillus refers to cells that are

rod shaped

term is used for v- or L- shaped formation of rod shaped prokaryotic cells

palisade

which cells have a single circular chromosome located in nucleoid

prokaryotic cells

t/f all cellular life has a dna genome organized into one or more chromosomes

true

where can prokaryotes be found?

everywhere on our planet

marshas role as a medical assistant in nigeria likely exposed her to:

high risk infectious disease

the major role of resident microbiota in human health is to

comptete with pathogenic microorganims for niches

how quickly can the microbiota of the small intestine change significantly

within 9 hours

prokaryotes contribute to climate change by

metabolizing carbon in thawing permafrost

which bacterium is an obligate intracellular pathogen and cause Q fever

coxiella burnetii

haemophilus ducreyi causes:

chancroid

how do planctomycetes reproduce

by budding

which bacteria are known fro their ability to process cellulose in the rumen of ruminating animals

bacteroides

which of the following disease is caused by M. tuberculosis

tuberculosis

mycoplasma pneumoniae is known to cause

“ walking pneumonia “

streptococci are classified based on

their ability to lyse red blood cells and lancefield grouping

staphylococcus aureus is known fro causing

skin infections and food poisoning

what is a unique characteristic of the genus gardnerella?

they can cause b=bacterial vaginosis

deinococcus radiodurans is especially resistant to

ionizing radiation

the class aquificae includes organisms that are

thermophiles and acidophiles

archaea can survive in

both mild and extreme enviornments