1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alexus [3.1K]
3 years ago
13

While covering these advances, we have strengthened the narrative by expanding and clarifying discussions; carefully defining ne

w terms; and adding new diagrams, photos, and electron micrographs.
Biology
1 answer:
nataly862011 [7]3 years ago
6 0

Answer:

Transmission electron microscope (MET): allows sample observation in ultra-thin sections. A TEM directs the electron beam towards the object to be increased. A part of the electrons bounce or are absorbed by the object and others pass through it forming an enlarged image of the specimen. To use a TEM, the sample must be cut into thin layers, not larger than a couple thousand thousands of angstroms. A photographic plate or a fluorescent screen is placed behind the object to record the enlarged image. Transmission electron microscopes can increase an object up to a million times.

A scanning electron microscope creates an enlarged image of the surface of an object. It is not necessary to cut the object into layers to observe it with an SEM, but it can be placed in the microscope with very few preparations. The SEM scans the image surface point by point, unlike the TEM, which examines a large part of the sample each time. Its operation is based on traversing the sample with a very concentrated beam of electrons, similar to the scanning of an electron beam on a television screen. The electrons in the beam can disperse from the sample or cause secondary electrons to appear. Lost and secondary electrons are collected and counted by an electronic device located on the sides of the specimen. Each point read from the sample corresponds to a pixel on a television monitor. The higher the number of electrons counted by the device, the greater the brightness of the pixel on the screen. As the electron beam sweeps the sample, the entire image of it is presented on the monitor. Scanning electron microscopes can enlarge objects 200,000 times or more. This type of microscope is very useful because, unlike TEM or optical microscopes, it produces realistic three-dimensional images of the object's surface.

You might be interested in
Describing a plant and what it needs. Include descriptions of the stems, roots, leaves, flowers, buds. Describe why photosynthes
charle [14.2K]

Answer:

Taproot systems feature a single, thick primary root, called the taproot, with smaller secondary roots growing out from the sides. The taproot may penetrate as many as 60 meters (almost 200 feet) below the ground surface. It can plumb very deep water sources and store a lot of food to help the plant survive drought and other environmental extremes. The taproot also anchors the plant very securely in the ground.

Fibrous root systems have many small branching roots, called fibrous roots, but no large primary root. The huge number of threadlike roots increases the surface area for absorption of water and minerals, but fibrous roots anchor the plant less securely

Explanation:

8 0
2 years ago
When 2 organisms donate half of their genetic material to make one new genetically unique organism. What is this called?
just olya [345]
It is called genetic enginering
5 0
3 years ago
Which statement about membranes is TRUE? Most plasma membranes contain more than 70% proteins sterol lipids are common in human
gulaghasi [49]

Answer:

Sterol lipids are common in human cell plasma membranes

Explanation:

Human plasma cell membrane contains sterol lipids and proteins which serves as structural maintainers of the cell.

6 0
3 years ago
PLZ HELP WILL GIVE BRAINLY Analyze environmental disturbances, such as climate changes, natural events, human activity and the i
Dvinal [7]

Answer:

All of these environmental disturbances use such energy present within the ecosystem to survive and reproduce. In order to conserve the health of the environment, the best thing that can be done is finding ways to reuse the energy as much as we can such as recycling cardboards or tin cans. Other ways would be to lower use of carbon emitting cars and have more conservation awareness.

7 0
3 years ago
What are some similarities and between Gigantopithecus and humans?
Basile [38]

Answer:

Gigantopithecus could stand on its hind legs, and the known jaws of Gigantopithecus widen towards the rear and proposed that this widening occurred to allow for the housing of a trachea‭ (‬the‭ ‘‬windpipe‭’ ‬that connects the lungs to the mouth opening‭) ‬when the skull was placed directly in top of the head like a human and not carried forward like a great ape.‭

6 0
2 years ago
Other questions:
  • Carefully read and ans
    9·1 answer
  • DNA has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. One
    12·1 answer
  • Genes provide a plan for __________________________________, but how that plan unfolds also depends on the _____________________
    14·1 answer
  • If evolution is based upon there being genetic diversity between generations, how does the lack of genetic differences existing
    5·1 answer
  • Are the nerves easy or difficult to find in the dissection of the starfish
    7·1 answer
  • After a search of nucleotide sequence databases, researchers identified an IRE in the 5c untranslated region of a gene encoding
    15·1 answer
  • Tell the Structure of the Earth. Full explanation please
    6·1 answer
  • Whoever can answer this is amazing ​
    9·1 answer
  • 1) A plant is a living _
    9·1 answer
  • The cactus has a specialized fleshy stem that is specialized to store water for long periods of time. Which plant tissue most li
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!