Question

17. Big Red's spot test produced the results shown below: What conclusions can be drawn from these results?

2. What mode of reproduction do bacteria use? Describe a bacterial growth curve. Describe what happens at each step along the curve. What are some parameters that would affect how the curve looks? How would you predict the curve would look under different conditions?

Answer 1

Lünbicêly toplicolders Stalvonary wag, so erumi Death TOHUJUOJxy Hot hoa time bacterial brown curile

Phare ! hag Phase! It is initial stage of Growth so it is slow or abs - ce of growth is seen. at May be clue to Mantenenu of cells to cultare condition ar clue to the initial love cell clensi lies lead to ditution of exo enzymer. Exponential or Log phare i- Max Granth Save is observed here. The no. of cells. gets double in a time intereal called as men generation time here Teak so gelowth is observed. Slalionary Chare - Ihrere is comtexbalancine, blw cell clivision net and clealta col cell. Sono increase in cell no. this drastic drop in greuth is clue to

-TARANG- Page No. Date: 11 nutrients or duelo Qubstances Heath phare this phare rute that come out of liable cell: ext increures growth as a net loss

Pactor 1 many ways Grown of bacteria is affected 1 factor quch as nutrition Contentralton ond other some also such as environmental factors Temp. it affects the growth of bacteria in many ways at lowest temp where growth com, be assisted is kla minimum temp. and the highert temp. where growth can be assisted ka max. temp. No growth obtained below or less. Thom minimum temp and More or higher temp. that Mox temp. optimam min. obro tem.

Date : 1 ( 2- pH pH also has impact refon bacter- ial cell growth bez it affect Tonic aspects of cell . _ a) Natural pH ronge (60.5 - 7.5) favour bacteria) quoui exception present 3- Nutrient concentration. I growth promoting Subsłomu promot growth of bacterial cell ar much as possible in faster rate and low conc. of nutri ents may lead to decreare in . grown scote u t species. - species ion's and salt - nutrient qarisus vequirements fons like kt, catt, mytt, fett, Zutt, cutt, mutta etc.to . are repared by all bacteria.

Date: however nach do not requred by max. bacterial cell or squid dolin very lowomom. V water ! Most essential factor for. bacterial growth at determined chale of Metabolic und physiological actitles 162 gaseous chequsi menk oxygen and cou are limp . it.com offects oz is required for curobic serpira Hon and obligar aerobic backvis Must regure. Or for growth. ex- Mycobackexiam forti Bacillus
Bacteria reproduce mainly by asexual method and also show sexual recombination (true sexual reproduction is absent ).

A​. Asexual reproduction.bacteria produce several type of asexual spores like ,sporangiospores,oidia,conidia,and endospores.however the most common of asexual reproduction is binary fission.

a.Binary fission. It is the most common method under favourable conditions of temperature, moisture and availability of nutrients . mature Bacteria cell divides in to two daughter cell .in this process the cell division is amitotic type i.e.,not involving the spindle formation .the binary division of bacterial cell involves mainly 3step.....1_replication of DNA .....2...mesosome division and membrane formation.... 3...cross-wall formation.

b..endospores...cells of certain bacteria e.g, bacillus,clostridium etc.form thick walled ,highly resistant bodies within the cell called endospores. One bacterial cell normally produces only a single endospores.

B.sexual recombination (genetic recombination): the bacteria exhibit a primitive form of sexual reproduction which differ from eukaryotic sexual reproduction bcz there is no gamete formation and fusion.

bacterial growth curve: