Explain how electron microscopes work and why some scientists might prefer to use electron microscopes instead of light microscopes.

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Answer 1

Answer:

Answer:

Electron microscopes differ from lightmicroscopes in that they produce an image of a specimen by using a beam of electronsrather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard lightmicroscopes.

Related Questions

Which below is not a way in which a contrail may form?
3Drag each tile to the correct location on the chart.A population of raccoons lives in a forested area with lots of trees. The raccoons eat insects, eggs, berries, nuts, and small animals such asrodents and frogs. One of the main predators of the raccoons are coyotes, which also prey on rabbits.Identify whether the changes to the ecosystem are more likely to increase or decrease the population of raccoons.Large parts of the forestare cut down for wood.Pollution from a nearby farmdecreases the populationof insects in the forest.Additional rain increasesthe population of plantsin the forestMore permits to huntcoyotes are approved.A disease decreasesthe population of rabbitsin the forest.Frogs in a pond nearthe forest experiencea population surge.Increases PopulationDecreases Population
Mutations that arepassed to offspring must occur
Why does water move through a membrane?
How long does nuclear waste need to be safely stored until it’s no longer hazardous

Lipids in a bilayer can diffuse laterally at a relatively fast rate, but \"flip-flop\" from one leaflet to the other very slowly without catalysis. Three protein families –flippases (or flipases), floppases, and scramblases – catalyze the movement of lipids across the bilayer. Sort each of the phrases as describing flippases, floppases, or scramblases. Choose the best, most-specific enzyme name. Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more phrases are sorted incorrectly.Not ATP-dependent, Activation may result in increased membrane lipid symmetry, ABC transporter, translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet, translocate phosphatidylserine, preventing apoptosis and engulfment by macrophages, move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet, move phospolipids across the lipid bilayer down the concentration gradient

Answers

Answer:

flippases translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet,

floppases, move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet, ABC transporter, move phospolipids across the lipid bilayer down the concentration gradient

scramblases Not ATP-dependent, Activation may result in increased membrane lipid symmetry, translocate phosphatidylserine, preventing apoptosis and engulfment by macrophages,

Explanation:

Flipases are transportes that require energy for their functioning (ATP dependent) beause they move phospolipids across the lipid bilayer against the concentration gradient (from extracellular side to cytosolic side).

Floppases are ABC transporters, opposite than flippases (move phospholipids from the cytosolic side).

Scrablases are bidirectional transporters, responsible for asymmetry formation. It also enables exposure of phosphatidylserineon the outer leaflet when it is necessary.

In chickens, comb shape is determined by alleles at two loci (R, r and P, p). A walnut comb is produced when at least one dominant allele R is present at one locus and at least one dominant allele P is present at a second locus (genotype R_ P_). A rose comb is produced when at least one dominant allele is present at the first locus and two recessive alleles are present at the second locus (genotype R_ pp). A pea comb is produced when two recessive alleles are present at the first locus and at least one dominant allele is present at the second (genotype rr P_). If two recessive alleles are present at the first and at the second locus (rr pp), a single comb is produced. A walnut is crossed with a pea chicken and the offspring consists of 3/8 walnut, 3/8 pea, 1/8 rose and 1/8 single. What are the probable genotypes of the parents

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Answer:

RpPp x RpPp

Explanation:

For the recessive trait to be expressed, both parents should have at least 1 allele for the recessive trait. Now you can see that both recessive traits were expressed in at least one of the off-springs, this means that both parents had the allele for each recessive trait.

Ten grams of hamburger were added to 90 ml of sterile buffer.This was mixed well in a blender. One-tenth of a ml of this slurry
was added to 9.9 ml of sterile buffer. After thorough mixing, this
suspension was further diluted by a 1/100 dilution followed by a
1/10 dilution. One-tenth of a ml of this final dilution was plated
on agar plates. After incubation, 52 colonies were present. How
many colony-forming units were present in the total 10 gram sample
of hamburger?

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Answer:

5.2 × 10 ⁹ cfus

Explanation:

Using the dilution factors

0.1 ml of the final dilution has 52 colonies

1 ml will have approximately 520 colonies

10 ml of the final sample will have 5200 colonies

at 1 / 100 dilution

1 ml of the sample will have 5200 colonies

100 ml of the sample will have 520000 colonies

1 ml of the 0.1 ml + 9.9 ml has 520000 colonies

10 ml will have 5200000

at the second stage of the dilution

0.1 ml of the slurry had 5200000 colonies

1 ml will have 52000000 colonies

10 ml will have 520000000 colonies

100 ml of the initial sample ( 10 grams + 90 ml ) = 5200000000 colonies =

5.2 × 10 ⁹ cfu

Use a dictionary to look up the meaning of the word providence from "Rikki-Tikki-Tavi." Which definition below most closely means providence? A. a unit of a religious order B. divine guidance or care C. a department of knowledge D. a town in the Central Bahamas

Answers

Answer:

B. Divine guidance or care.

Explanation:

The short story "Rikki-Tikki-Tavi" is by Rudyard Kipling that revolves around the character of a mongoose with the title name. This story narrates how this small animal became a trusted part of the family and also saved them and the house from the dangerous cobra Nag and his family.

In the story, Rikki-tikki had just fought off Nag and Nagina and also Karait when Teddy's parents came. They exclaimed that he had saved their son from being bitten and were grateful for him. Teddy's father claims "he was a providence", which can be fairly taken as being guided or cared for by a divine being.

So, the correct definition closest to the word "providence" is option B. divine guidance or care.

When molecules move from areas of high concentration to areas of low concentration

Answers

Answer:

the answer is passive transport

What is not a factor that contributes to the variation in asl grammar and vocabulary?

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We have to remind them that ASL is their language and itdoes not reflect their intelligence. Language variation in the Deaf World iscalled register. Register refers to variation in language according to theformality or informality. Intimate, casual, consultative, formal, andfrozen. Some Deaf feel low when they usestrong ASL, feeling that they do not have good English.

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