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3 years ago

Why are there different sizes of bacterial colonies?

Biology

2 answers:

Elena-2011 [213]3 years ago

7 0

Answer:

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.

Dimas [21]3 years ago

7 0

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.

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Lostsunrise [7]

Answer:

Rome had fertile soil on their Italian Peninsula, while the Greeks had poor soil on their Pelopennesus Peninsula.

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3 years ago

1. Fingerprints may be resolved into three large, general groups of patterns: the arch, the loop, and the ____.

LenKa [72]

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4. The right answer is FACES.

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5. The right answer is DNA profiling.

A genetic fingerprint, or genetic profile, is the result of a genetic analysis, making it possible to identify a person from a small amount of their biological tissues (hair bulb, blood, saliva, vaginal secretion, sperm).

6. The right answer is Criminal Investigative Analysis.

Criminal analysis is a method of analysis and investigation in the criminal field based on the use of new technologies (computer science). Criminal analysis distinguishes itself from behavioral analysis (criminal profiling).

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4 0

4 years ago

Yeast cells are recovered from a fermentation broth by using a tubular centrifuge. Sixty percent of the cells are recovered at a

Serga [27]

Answer:

$\\ \omega = 5033.22 \ rpm$

Explanation:

Given that:

$R_1 = 0.6\\\\R_2 = 0.95\\\\\omega_1 = 4000 \ rpm\\\\\omega_2 = ???\\\\Q_1 = 12\ l/min\\\\Q_2 = 12\ l/min$

For a continuous centrifuge ; solid recovery R ∝ $\frac{\omega^2}{Q}$

where;

ω = angular velocity of the centrifuge in rpm

Q = flow rate

SO;

$R_1 \alpha \frac{4000^2}{12}$

$R_2 \alpha \frac{\omega^2}{12}$

$\frac{R_1}{R_2} = \frac{4000^2}{12}$ ÷ $\frac{\omega^2 }{12}$

$\frac{R_1}{R_2} = \frac{4000^2}{12} * \frac{12}{\omega^2}$

$\frac{R_1}{R_2} = \frac{4000^2}{\omega^2}\\\\\frac{0.6}{0.95} = \frac{4000^2}{\omega^2}$

${\omega^2} = \frac{4000^2*0.95}{0.6}\\\\\\{\omega} = \sqrt{ \frac{4000^2*0.95}{0.6}}\\\\\\ \omega = 5033.22 \ rpm$

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3 years ago

The process of genetic engineering: A) works to change outcomes of traits by altering genetic material. B) is the manipulation o

GuDViN [60]

D) All of the above

Explanation:

Genetic engineering "allow scientists to create their own mutations in the organisms" by "manipulating the genetic code in attempt to improve a species" which is virtually the same as"altering genetic material".

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4 years ago

What are the structures dealing with the skull?

riadik2000 [5.3K]

The skull is divided into 2 parts
CRANIUM and FACE...
Cranium structures are : Frontal, Sphenoid, Temporal, Parietal, Occipital, Ethmoid
Face structures are: Zygomatic, Maxilla, Nasal, Lacrimal, Mandible..

Hope this helped

8 0

4 years ago