Compare and contrast light microscopes, scanning electron microscopes, and transmission electron microscopes. Sort each statemen
t into the correct box. Some statements may apply to more than one type of microscope. Some statements may not be used. Use a beam of electrons to produce magnified images added to Scanning Electron MicroscopesUse a beam of electrons to produce magnified images Can be used to examine living cells and tissues Can be used to examine DNA Light microscopes Use a beam of light to produce magnified imagesCan be used to examine cells Scanning Electron Microscopes Can be used to examine cellsCan be used to examine DNAUse a beam of electrons to produce magnified images Transmission Electron Microscopes Can be used to examine cells
use a beam of electrons to produce magnified images
can be used to examine DNA
can be used to examine cells
<u>Transmission electron microscope</u>:
use a beam of electrons to produce magnified images
can be used to examine DNA
can be used to examine cells
Explanation:
Light microscope: is a commonly used microscope also known as compound microscope. Magnifies images from 40X upto 1000X. It uses ray of visible light to produce a magnified image. The light microscope can be used to view specimen of both living and dead cells or tissues. However, it doesn't give a detailed view of a specimen like electron microscope.
Scanning electron microscope: It uses electron beam as an illuminating source. It has a much higher resolving power than light microscope because it uses electrons instead of light. It magnifies object upto 500000 times the actual size. Internal structures can also be viewed. However, only dead specimen can be used because the beam of electrons can kill the cells. They are of two types:
<u>Scanning electron microscope(SEM): </u>an electron beam passes over the specimen's surface and displaces electrons which are then focused on a screen to form an image. Images appear in 3-D
<u>Transmission electron microscope: </u>electromagnets magnify the image by passing beam of electrons through a thin specimen. Images appear in 2-D
Scientists have been concerned that human activities could cause more plants and animals to become extinct than any point in the past. Along with human-made changes in climate (see above), some of these extinctions could be caused by overhunting, overfishing, invasive species, or habitat loss
Unlike all the other cells in a human body which are diploid, human sex cells are haploid. That means that both sperm cells and ova are haploid; containing only 23 chromosomes.
The integumentary system is the skin. Skin protects the inner organs from Bactria. Essentially the skin is a wall protecting against the outside world. It doesn't really release anything but is just there for protection.
During replication, DNA sequence is maintained in the new strands
The reason for it is the action of DNA Polymerase. This is an enzyme who has the function of "proofreading" the DNA sequence to ensure that all nucleotides are in the right order. This process is so accurate that an incorrect base is introduced every 10⁹-10¹⁰ bases.
