Which of the following best explains how a scanning electron microscope is used to produce an image of a specimen? an electron beam strikes the specimen, is absorbed by the specimen, and used to produce an electrically charged image on a screen. an electron beam passes over the specimen’s surface and displaces electrons, which are then focused on a screen to form an image. an electron beam traces an outline of the specimen onto a screen, and reflected electrons are collected to form the rest of the image. an electron beam travels through the specimen, and as it does so it burns an image of the specimen on a screen.

The correct answer is B) An electron beam passes over the specimen's surface and displaces electrons, which are then focused on a screen to form an image.

An electron beam passes over the specimen's surface and displaces electrons, which then focused on a screen to form an image.

A scanning electron microscope is a microscope which studies the surface characteristics of the specimen. It focuses an electron beam over a surface of the specimen to create an image. Electron beam supplied by scanning electron microscope interact with the surface of the specimen. The reflected electrons also known as back scattered electrons are collected to create image on the screen.

answer; ///i believe that the correct answer is (the worksheet);

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'