What the microscope user may have to do to combat the problems?
What the microscope user may have to do to combat the problems?
8. Explain what the microscope user may have to do to combat the problems incurred in question # 7. To combat the issues of lower light intensity, the microscope has a diaphragm which can vary the intensity of light. A user must adjust the diagram in order to see clearer.
Which of the following should not be used with the microscope under high magnification?
Which of the following should NOT be used w/the microscope under high magnification? One of the most common mistake students make in using the microscope is using the coarse adjustment at higher magnifications (such as high-dry and oil immersion). This may damage slide and lens; also messes with the focus.
How does the procedure for using the microscope differ under high power as opposed to low power?
When you change from low power to high power on a microscope, the high-power objective lens moves directly over the specimen, and the low-power objective lens rotates away from the specimen.
When you are attempting to view a specimen on a microscope and you move to high power and lose the image you were just observing on the lower power what should you do?
NOTE: If you lose the image on high power, go back to low power and find/focus it before going up to high power again. 14. When you are finished with the microscope, return the scanning lens (4X) to place. Lower the stage completely, remove the slide, and carefully place into the correct box.
Why does DNA look like a twisted ladder?
Phosphates and sugars of adjacent nucleotides link to form a long polymer. They showed that alternating deoxyribose and phosphate molecules form the twisted uprights of the DNA ladder. The rungs of the ladder are formed by complementary pairs of nitrogen bases — A always paired with T and G always paired with C.
Why is it called Photo 51?
The image was tagged “photo 51” because it was the 51st diffraction photograph that Franklin and Gosling had taken. It was critical evidence in identifying the structure of DNA.
Who really found DNA?
What did the duo actually discover? Many people believe that American biologist James Watson and English physicist Francis Crick discovered DNA in the 1950s. In reality, this is not the case. Rather, DNA was first identified in the late 1860s by Swiss chemist Friedrich Miescher.
Who are the 2 most determined DNA detectives?
Two of the most determined of the DNA detectives are Francis Crick and an American, James Watson.
Who gave picture 51?
The program draws on extensive interviews with surviving major participants in the DNA drama, including Maurice Wilkins, deputy director of the lab where Franklin worked, who casually showed her crucial Photo 51 to Watson; Raymond Gosling, Franklin’s PhD student with whom she made Photo 51; and Nobel Prize recipient …
Who did Rosalind Franklin give 51 to?
Maurice Wilkins
What did Erwin Chargaff conclude from his experiments?
He fractionated out nuclei from cells. He then isolated the DNA from the nuclei and broke it down into its constituent nucleic acids. Chargaff drew the conclusion that it is in fact the DNA in the nucleus of the cell that carries genetic information rather than the protein.
What was chargaff’s experiment?
Chargaff adapted the paper chromatography technique to separate out the four nitrogenous bases of DNA. The four bases of DNA – adenine, guanine, thymine and cytosine – are the parts of the molecule that do the actual coding of our genes.
Where did chargaff do his experiment?
Cambridge