Biology, 14.12.2020 07:40 janellesteele9104

Why are there different sizes of bacterial colonies?

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Answer from: rpmgamer

colony size reduce means somehow its growth rate was hampered. In your experiment you r use salt but salt has a negative effect on E.coli.It dis regulate the osmotic balance of this bacterial cell after tolerance concentration may be this is the main reason of smaller colony size.

Answer from: thedocgalloway

The average colony size and total biomass on a plate are equivalent whether competition is local or global (assuming all resources are consumed). However, if the balance of uptake and diffusion causes interactions to be local, spatial location matters, and some colonies will grow much larger than others. Why do bacterial colonies reach a certain size and then stop growing? They deplete the accessible nutrients from the agar that is immediately around the colony. However, there are some species that spread out faster than the agar is depleted of nutrients. These species will overgrow the entire surface of the agar. Each distinct circular colony should represent an individual bacterial cell or group that has divided repeatedly. Being kept in one place, the resulting cells have accumulated to form a visible patch. Most bacterial colonies appear white, cream, or yellow in color, and fairly circular in shape. In general, as environmental conditions become less favorable, the pattern of growth in a colony becomes more complex. Two of the main factors that affect bacterial growth in a laboratory are media nutrient density and media hardness, the latter being a result of agar concentration.

Answer from: Quest

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

Answer from: Quest

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

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