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asambeis [7]
3 years ago
12

A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated. After a negligible lag

phase, the culture goes into exponential growth for two hours. The generation time for the bacterium is fifteen minutes. Which equation is the correct one to determine the number of cells present after two hours of log phase growth?
a. 1000 X 28
b. 1000 X 16
c. 1000 X 22
d. 1000 X 2 X 2 X 15
Biology
1 answer:
OLga [1]3 years ago
4 0

Answer:

<h2>a.</h2>

Explanation:

Given;

Initial population of bacteria = 1000;

exponential growth for 2 hours;

generation time = 15 minutes;

so,

Bacteria are doubling in every fifteen minute,

In staring, there are 1000 bacteria and after fifteen minutes they become 2000 and after next fifteen minutes bacteria again doubles and become 4000   and so on for next two hours.

so after 2 hours, number of cells of  bacteria present are 1000 X 2^8

Total bacterial cells after two hours= 256000.

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Explanation:

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Dead plant matter

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5 Why is it easier to digest sour milk than fresh milk?​
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Sour milk contains less lactose than the fresh milk, as the sour milk gets converted to lactic acid and bacteria which enhances the digestion process. One important reason is that proteins take more time in getting digest than other nutrients. We know that fresh milk has a large amount of lactose.

Explanation:

The lactic acid bacteria have many benefits. They improve lactose digestion in the stomach. The lactase activity of the bacteria performs  the task of digesting lactose in the product once it reaches the intestine thus fuelling the process of digestion in case of sour milk.

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3 0
3 years ago
Match the term on the left with its definition on the right.
noname [10]

Answer:

1. Eutrophication  - When fertilizers, animal waste, or sewage flow into waterways, causing algal blooms  and depriving other organisms of oxygen .

2. Biological  augmentation  - Adding natural predators to a damaged ecosystem .

3. Ecological  footprint  - The number of natural resources used to support an individual's lifestyle .

4. Biodiversity  hotspot  - Areas of high biodiversity that have been significantly impacted by human activities .

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Explanation:

  • Eutrophication

The enrichment of an aquatic ecosystem by minerals and nutrients caused by animal waste, human activities like sewage flow, farming, etc that lead to fertilizer runoff into waterways causing algal blooms which results in the oxygen depletion of the aquatic ecosystem. Algal blooms block sunlight from getting into the water and deprives other organisms of oxygen, thus harming the plants and animals in the ecosystem. Some species of algae produce toxins that are harmful to human or marine life.

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It is the most efficient way to clean and restore nature and natural resources like water bodies, soil, etc by decomposing pollutants and adding essential materials to a damaged or degraded ecosystem with the use of organisms such as bacteria. Examples include increasing the available nitrogen in soil by nitrogen-fixing plants, wastewater treatment, cleaning of ponds and lakes by adding bacterial cultures, enzymes, etc.

  • Ecological footprint

It measures the number of natural resources and how fast they are consumed to support people or an economy and also the waste generated, i.e., measurement of human demand on nature. For the calculation of ecological footprint, the usage of certain categories of productive surface areas such as forest area, cropland, fishing grounds, grazing land, built-up land, carbon demand on land, etc is tracked. Based on this information, the quantity of natural resources we have and how much of these resources are used is measured.

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4 0
3 years ago
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zepelin [54]

Answer:

This cycle takes approximately 100,000 years to complete.

Explanation:

PLATO

3 0
2 years ago
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