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2 years ago

How does phase contrast microscopy help scientists to visualize difficult specimens?

Biology

2 answers:

fredd [130]2 years ago

8 0

Answer:

The asnwer is Allows observation and study of living cells.

Explanation:

The phase contrast microscope allows observation of uncolored cells, which is very useful for the study of living cells. This type of procedure helps scientists study difficult samples, because most living organisms cannot be dyed or colored, since the dyes used could damage their cell structure and even cause them to die.

Oksanka [162]2 years ago

4 0

The phase contrast microscope uses out-of-phase and in-phase light rays that produce contrast areas allowing scientists to detect even a minute number of protein molecules and focus on the minute internal structures of a particle.
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How do you determine if<br> something is living

velikii [3]

Answer:

1. They have to be able to reproduce, either asexually or sexually.

2. They have to be able to respond to stimuli.

3. They have to have cells, either as a unicellular organism or as a multicellular organism.

4. They have to grow and develop.

5. They have to have homeostasis. This means that they can maintain their own body temperature. Think of this as a thermometer for the body.

6. The last thing is that all living things also have to be able to do is move.

Explanation:

3 0

3 years ago

When the birth rate is equal to each woman producing exactly enough offspring to replace herself and her offspring's father, and

Ostrovityanka [42]

Answer:

R = 0 and no population growth.

Explanation:

Birth rate may be defined as the growth of individual per thousand and death rate determines the death of individual per thousand in a year. The birth and death changes the population dynamics.

The growth rate depends on both the factors that are birth rate and death rate. Here, the birth rate is balanced or equal that replace the offspring father. The change in the population growth is same and the birth and replacement almost cancel out each other. In this case, the birth rate is zero and population do not grow.

Thus, the answer is R = 0 and no population growth.

5 0

2 years ago

Interpretations based upon emotions or opinion are considered

egoroff_w [7]

They are considered as biased. Explanation: It's biased because it's based on how we feel instead of facts

7 0

3 years ago

Arrange the following events in the order in which they occurred.

Mumz [18]

Answer:

1→4→5→3→2

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Mitotic cell division starts with the condensing of chromosome accompanied by splitting of the centrosome and its movement towards the opposite poles.

∙

As the nuclear envelope and nucleolus disappear, spindle fibres arise from the centrosomes and start binding to the condensed chromosomes at the centromeres.

∙

The chromosomes bound by the spindle fibers are then arranged in the middle of the cell forming the equatorial metaphase plate.

∙

Next the centromere splits and the sister chromatids are pulled away towards the poles by the contraction of spindle fibres.

∙

Following this, a cleavage furrow starts to develop in the middle of the cell while the nuclear membrane starts to reappear around the separated chromatids.

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The condensed chromatids start thinning into chromatin fibre along with reappearance of the nucleolus and the cleavage furrow deepening further.

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Finally as the nuclear membrane becomes fully intact, the cleavage furrow deepens and split the cells from middle into two daughter cells.

8 0

1 year ago

pav-90 [236]

Answer

it is B oxygen

6 0

2 years ago