C1.1: The Microscope in Cell Studies m.m.D

Which of the following descriptions of light and electron microscopes is not correct?

• An electron microscope has a maximum magnification of x500000

• A light microscope has a maximum resolution of 0.2 µm

• An electron microscope has a maximum resolution of 0.05 nm

• A light microscope can resolve specimens that measure 200 nm in diameter

A prokaryotic cell with a diameter of 1 µm is magnified 50 000 times by an electron microscope. What is the diameter of the cell in the resulting electron micrograph?

• 5 mm

• 5 x 10⁻¹ mm

• 5 x 10² mm

• 5 x 10¹ mm

The electron micrograph below shows the organelles in a leaf cell, as well as a scale bar and on-screen ruler. What is the magnification of the image?

• x7000

• x3570

• x2800

• x280

The electron micrograph below shows a root vascular system. The magnification of the image is x200 and Y has a diameter of 1 cm when measured using a ruler. What is the diameter of the cell labelled Y?

• 100 μm

• 50 μm

• 10 μm

• 5 μm

To view the actual width of a transverse section of a xylem vessel with a x40 lens, which

steps are needed??

• 1 & 2

• 2 & 3

• 1 & 3

• 1 & 4

The electron micrograph of a bacterial cell has a 2 cm scale bar. What is the magnification of the image?

Erythrocytes (red blood cells) have a diameter of 7 000 nm. Pancreatic cells have a diameter of 35 μm. Which of these statements about the relative sizes of these cells is correct?

• The erythrocytes are 5 times smaller than pancreatic cells

• The erythrocytes are 50 times smaller than pancreatic cells

• The erythrocytes are 5 times larger than pancreatic cells

• The erythrocytes are 50 times larger than pancreatic cells

The table shows some approximate units for measuring the diameters of alveoli, white blood cells and the width of cell walls. Which of the rows show the correct units for these structures?

• A

• B

• C

• D

The following statements describe slide preparation. Which statement would not be relevant in the preparation of a wet mount for observation with a light microscope?

• Methylene blue is added to the specimen

• A coverslip is placed on the specimen

• The low power lens is above the object on the stage

• A drop of water is added to the specimen

The following statements describe producing a scientific drawing. Which is not a correct statement about drawing scientifically?

• The magnification should be stated

• Label lines should have arrowheads

• White, unlined paper should be used

• Lines should be drawn with a smooth continuous line