Unit 1 - Cell Biology: Investigating Cells Certification Review Exam Questions With Multiple Choices And Answers.

What is the typical diameter of a plant cell? - correct answer 0.1mm. What is the typical diameter of an animal cell? - correct answer 0.02mm. What is the typical length of a prokaryotic cell? - correct answer 0.002mm. How many centimetres (cm) are there in one metre (1m)? - correct answer 100 (1x10²). How many millimetres (mm) are there in one metre (1m)? - correct answer 1,000 (1x10³). How many micrometres (μm) are there in one metre (1m)? - correct answer 1,000,000 (1x10⁶). How many nanometres (nm) are there in one metre (1m)? - correct answer 1,000,000,000 (1x10⁹). What is the size of cells often given in? - correct answer Micrometres (μm). For example, a plant cell may be 100μm, and an animal cell may be 20μm. What is the ability to see two or more objects as separate objects called? - correct answer Resolution. The light microscope was developed in the late 16th century for what purpose? - correct answer To give a greater resolution than the human eye. It allowed scientists to see plant, animal and bacterial cells. Why can't some sub-cellular structures be seen under a light microscope? - correct answer They are smaller than the light microscope's resolution. What is an electron microscope (first used in 1933)? - correct answer A microscope that passes electrons, rather than light, through the specimen and can give much better resolution. With an electron microscope, the structures inside mitochondria and chloroplasts can be seen. What has this helped scientists do? - correct answer Scientists can now study them and find out how they work. With an electron microscope, ribosomes can be seen. What has this helped scientists do? - correct answer Study the ribosomes' role in making proteins. What is 'magnification'? - correct answer How many times larger the image is than the real object. What is the formula for working out magnification? - correct answer Magnification = size of image / size of real object. Is magnification the same as resolution? - correct answer No. Light microscopes can be built to magnify more and more, but after a certain point the images do not get any clearer.