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marishachu [46]
3 years ago
14

During the growth of a bacterial population, the phase called the _______ is occurring when the number of newly formed cells of

bacteria that are alive are equal in number to the number of dead or dying cells.
Biology
1 answer:
Xelga [282]3 years ago
8 0

Answer:

<h2>Stationary phase</h2>

Explanation:

Bacterial growth curve is divided into four phase lag, log, stationary and death. In the lag phase, the bacterial cell do not grow much faster because most of them are adapting to the new environment.

In the log phase, the bacteria grow exponentially because of the presence of abundant nutrients. In the stationary phase, the number of living cells becomes equal to the number of dying cells. So in the stationary phase, the growth rate of bacteria becomes equal to the death rate of bacteria.

This can occur because the culture reached its carrying capacity. Therefore the correct answer is the stationary phase.

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Which of the following types of reproductive barriers separates a pair of insect species that could interbreed except that one m
Arte-miy333 [17]

Answer:

Answer is B, habitat isolation.

Explanation:

Habitat isolation can simply be explained as a situation whereby two insects or organisms of the same species, that have the ability to meet and reproduce could not, because they are living in different habitats.

These different habitats might even be in the same geographical location or area. That is, one insect might be living in or on the surface of the water, and the other living in the soil or the tree. Due to this effect, the insects are unlikely to meet and reproduce.

8 0
3 years ago
Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of
Zarrin [17]

Answer :Erwin Chargaff   a Biochemist

Explanation:

He formulated the base paring of double helix of DNA. He reasoned that since the percentage of four  DNA  bases are of this proportions in human;

                                  Adenine=30.9% and Thymine =29.4%;

                                  Guanine=19.9% and Cytosine =19.8%

Then,  the amount of adenine will always be equal to thymine,

And the amount of Guanine equals to cytosine based on this percentages of distribution.  

(Adenine and Guanine are large, molecule of Purines, while thymine and Cytosine are Pyrimidine)  

 

He concluded (although scientist believed, he did not explicitly stated this) that this should be the base paring patterns in DNA molecule. This is the first Chargaff Rule.

His second rule is that the DNA composition, in the relative amount of the four bases Adenine, Thymine, Cytosine and Guanine varies in proportion from one organisms to another. And this is the basis of molecular diversity.

6 0
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Which of the following is not a source of groundwater pollution?
svetlana [45]
I would say C or D

Hope This Helps




8 0
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ETS is responsible for more lung cancer deaths than heart disease deaths annually

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