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- Growth in Bacteria: 4 Main Phases
- Binary Fission and other Forms of Reproduction in Bacteria
- Bacterial growth
- 2.2: Bacterial Growth and Reproduction
Although a given bacteria typically uses a limited range of compounds, bacteria as a group can utilize a wide range of compounds as nutrients:. The cycle of events in which a cell grows, and divides into two daughter cells, is called the cell cycle. Figure 2. The cell division cycle can be thought of as a linear sequence of three periods : I , C and D.
Growth in Bacteria: 4 Main Phases
Bacteria reproduce primarily by binary fission , an asexual process whereby a single cell divides into two. Under ideal conditions some bacterial species may divide every 10—15 minutes—a doubling of the population at these time intervals. Eukaryotic microorganisms reproduce by a variety of processes, both asexual and sexual. Some require multiple hosts or carriers vectors to complete their life cycles. Viruses, on the other hand, are produced by the host cell that they infect but are not capable of self-reproduction. The study of the growth and reproduction of microorganisms requires techniques for cultivating them in pure culture in the laboratory. Data collected on the microbial population over a period of time, under controlled laboratory conditions, allow a characteristic growth curve to be constructed for a species.
Nataliya, a year-old pregnant woman in her second trimester, visits a clinic with complaints of high fever, All of her immunizations are up to date. However, the health-care provider who sees Nataliya is concerned and orders a blood sample to be sent for testing by the microbiology laboratory. The bacterial cell cycle involves the formation of new cells through the replication of DNA and partitioning of cellular components into two daughter cells. In prokaryotes, reproduction is always asexual, although extensive genetic recombination in the form of horizontal gene transfer takes place, as will be explored in a different chapter. Most bacteria have a single circular chromosome; however, some exceptions exist.
Binary Fission and other Forms of Reproduction in Bacteria
Request PDF | Bacterial Reproduction and Growth | Bacteria growing in a suitable medium increase in number by having each cell increase in size, and then.
The following points highlight the four main phases of growth in bacteria. The phases are: 1. Lag Phase 2.
Bacterial growth is proliferation of bacterium into two daughter cells, in a process called binary fission. Providing no event occurs, the resulting daughter cells are genetically identical to the original cell.
2.2: Bacterial Growth and Reproduction
Bacteria are single celled microbes. The cell structure is simpler than that of other organisms as there is no nucleus or membrane bound organelles. Instead their control centre containing the genetic information is contained in a single loop of DNA. Some bacteria have an extra circle of genetic material called a plasmid. The plasmid often contains genes that give the bacterium some advantage over other bacteria. For example it may contain a gene that makes the bacterium resistant to a certain antibiotic. Bacteria are classified into five groups according to their basic shapes: spherical cocci , rod bacilli , spiral spirilla , comma vibrios or corkscrew spirochaetes.
Skip to main content. Most bacteria rely on binary fission for propagation. Conceptually this is a simple process; a cell just needs to grow to twice its starting size and then split in two.
Reproduction patterns. During their growth cycles, microorganisms undergo reproduction many times, causing the numbers in the population to increase dramatically. Reproduction can also occur by a sexual process in which haploid nuclei unite to form a diploid cell having two sets of chromosomes. Various changes then follow to yield a sexually produced offspring. Sexual reproduction has the advantage of mixing chromosomes to obtain genetic variations not possible with asexual reproduction. However, fewer individuals normally result from sexual reproduction than from asexual reproduction. More details on these methods are provided in the chapters on fungi and protozoa.
synthesis of the bacterial components and especially the nucleotides for DNA synthesis. Page 4. ○ The production of two daughter bacteria requires the growth.
Дверь высотой в шесть метров закрылась с гулким стуком, и Беккер оказался заперт в Божьем доме. Он закрыл глаза и постарался сползти на скамье как можно ниже: он единственный в церкви был не в черном. Откуда-то донеслись звуки песнопения.