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2 years ago

The oil immersion objective is necessary to determine the morphology of prokaryotes

2 answers:

6 0

To clearly view the morphology of the prokaryotes, one needs a microscope with higher resolution i.e magnification of ×100. Use of oil for this purpose is important because it reduces the refraction of light as it travels from air to glass. this process increases the resolution of the microscope making it possible to view morphology of bacteria.

Liula [17]2 years ago

5 0

This is very true.
Prokaryotes are microorganisms and come in different shapes that would not be visible and recognizable to the normal human eyes by any means but with the oil immersion objective, The oil immersion objective enable a person to be able to view these bacterias at a size that is 1000 times the apparent size of the prokaryotes.

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Name and briefly describe the three essential principles of test construction ap psych

Natasha_Volkova [10]

<span>The three essential principles of test construction are listed below:
I. Standardization
II. Reliability
III. Validity

</span>Standardization- To standardize a test means that test is given to a large, representative sample of people, in order to establish the norms that future test takers are compared against (using a normal distribution)

Reliability - This principle requires that a test must produce reliable, consistent results when it is repeated. The reliability of a test can be verified using the test-retest method or the split-half method.

Validity - This refers to the ability of a test to measure what it was designed to measure.

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2 years ago

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In a flowering plant, tall (T) is dominant to short (t), and blue flowers (B) is dominant to white flowers (b). A tall plant wit

Bumek [7]

<h3>Answer: </h3><h3 />

25%

<h3>Explanation:</h3>

Following a cross between <u>Ttbb</u> and <u>ttBb</u>, the resulting offspring would be:

TtbB , TtbB , Ttbb , Ttbb , ttbB , ttbB , ttbb , ttbb , TtbB , TtbB , Ttbb , Ttbb , ttbB , ttbB , ttbb , ttbb

To have a clearer idea, see the attached image.

Of the 16 possible combinations from this dihybrid cross, there will be:

4 tall plants with blue flowers

4 tall plants with white flowers

4 short plants with blue flowers

4 short plants with white flowers

There are 4 possible genotypic recombinations that would yield short plants with white flowers out of a possible 16, so the chance that the offspring will be short with white flowers would be 4/16 which is 1/4 or 25%

<h3>Hope this helps</h3>

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2 years ago

Alysha wants to test the effect of different materials on the melting rate of ice. She finds the initial mass of four pieces of

Tanzania [10]

Answer:

In the experiment conducted by Alisha to test the effect of different materials on the melting rate of ice, the dependent variable is the mass of the ice, and the independent variable is the type of cover material.

Explanation:

During an investigation or experiment, the dependent variable is the one whose changes will be studied, while the independent variable is able to influence the changes of the dependent variable.

In the case where it is wanted to <u>measure how different cover materials affect the rate of ice melting</u>, the dependent variable is the mass of ice and the independent variable is the coverage material, capable of affecting the time it takes for the ice to melt.

Learn more:

Dependent and independent variables brainly.com/question/967776

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2 years ago

Perception is the process by which a. stimulus energies are transformed into neural activity. b. sensory input is organized and

Elanso [62]

Perception is the process by which sensory input is selected, organized, and interpreted.

Answer: B)

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2 years ago

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Explain how some algal species are able to survive during periods of nutrient starvation and extreme temperatures. (Site 1)

liubo4ka [24]

Answer:

Explanation:

Some algae are phototrophs and this enable their survival during nutrients starvation at extreme temperature.

These phototrophs algae use light energy from sunlight, carbondioxide and water to synthesis organic food. The food produced is use as a survival means during nutrient starvation and they consume the food.

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2 years ago