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lions [1.4K]
2 years ago
6

1. If I view through low power objective 10x and ocular 4x, what is the total magnification of the microscope?

Biology
1 answer:
Harlamova29_29 [7]2 years ago
8 0

1. If a slide is viewed through a low power objective of 10x and ocular of 4x, the total magnification can be calculated thus:

Total magnification = objective magnification x ocular magnification

                                  = 10 x 4

                                       = 40

2. In order to study the detailed structure of a cell, a high-power objective comes highly recommended. This is because the high-power objective will magnify the essential details of the cell and enables the detailed structure of the cell to be seen.

3. In order to count red blood cells in a blood sample, an objective with a large field of vision comes highly recommended. The higher the magnifying power of an objective, the lower the field of vision. Thus, a low power objective would be the best for counting the red blood cells in a sample.

4. The stage at which chromosomes line up in the center of the cell during mitosis is the metaphase. Mitosis consists of 4 essential stages which are:

  • prophase: the stage at which the genetic materials in the cell condenses and become visible as chromosomes under the microscope.
  • metaphase: the chromosomes line up at the center or the equator of the cell while spindle fibers engage each chromosome at the kinetochore of the centromere
  • anaphase: chromosomes are pulled apart and separated into sister chromatids as a result of the shortening of the spindle fibers. Further shortening of the spindle fibers kick-starts the migration of sister chromatids towards the opposite ends of the cell.
  • telophase: sister chromatids complete their migration to the poles. The chromosomes decondense and the cytoplasm of the cell divides in a process known as diakinesis.

5. with reference to the explanation above, the stage of mitosis at which one would see sister chromatids moving towards the pole would be the anaphase.

More on mitosis can be found here: brainly.com/question/12479053

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Saturated fats – which are found in butter, cheese, red meat and other animal-based foods. Decades of sound science has proven it can raise your “bad” cholesterol and put you at higher risk for heart disease.

Thus the saturated fats are differs from the unsaturated fats.

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A scientist is using a species of green algae to study the electron transport chain in photosynthesis. He uses a laser to inacti
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Answer:

D) In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.

Explanation:

The light dependent reaction of photosynthesis, which produces the ATP and NADPH needed in the light independent stage of the process, includes complexes of proteins and pigments called PHOTOSYSTEMS. These photosystems (I and II) are key to the functionality of the light dependent reactions in the thylakoid.

The major pigment present in both photosystems is CHLOROPHYLL A, which absorbs light energy and transfers electrons to the reaction center. Chlorophyll B is only an accessory pigment meaning it can be done without. Hence, if all of the chlorophyll A is inactivated in the algae but leaves chlorophyll B intact as in case 1, both PS I and PS II will lose their function because Chlorophyll A is the major pigment that absorbs light energy in both photosystems.

In case 2, if PS I is inhibited and PS II is unaffected, a PROTON GRADIENT WILL STILL BE PRODUCED because the splitting of water into protons (H+) and electrons (e-) occurs in PSII. Hence, H+ ions can still be pumped into the inner membrane of the thylakoid in order to build a proton gradient even without the occurrence of PS I.

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A population of Drosophila simulans carries three alleles at the white locus: the wild-type allele at 86 percent, w1 at 9 percen
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Answer:

the population is polymorphic.

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Polymorphism is the discontinuous genetic variation that leads to the production of varying unique kinds or forms of individuals within the population of an individual species.

Take for instance, allelic polymorphism is seen in the presence of multiple alleles that is produced within the members of an individual species as in peppered moths, human blood groups, and two-spotted ladybugs.

We have different causes of polymorphism: polymorphism can be sustained by an equity among variation developed by new mutations and natural selection. Genetic variation might be due to frequency-dependent selection.

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