Magnification and Cell Structure Review

The diameter of a red blood cell in a diagram was measured as 2.5 cm. The actual diameter of the red blood cell was 7 μm. Which calculation would give the correct magnification for the red blood cell in the diagram?

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Which structures are found in both chloroplasts and mitochondria?

1 70S ribosomes

2. 2 80S ribosomes

3. 3 circular DNA

• 1 and 3

• 2 and 3

• 1 only

• 3 only

Radioactively labelled amino acids are introduced into a cell that is actively secreting an enzyme. In which cell structure will the radioactivity first become concentrated?

• A

• B

• C

• D

Ribosomes exist as separate subunits that are bound together during protein synthesis. What do these subunits consist of?

• mRNA and protein

• mRNA and tRNA

• rRNA and protein

• rRNA and tRNA

Some cell structures are listed.

1 mitochondria

2 nucleus

3 chloroplasts

4 ribosomes

What is the correct order of these cell structures when listed from largest to smallest?

• 1, 2, 3, 4

• 2, 3, 1, 4

• 2, 4, 1, 3

• 3, 4, 2, 1

Which cell structures have ribosomal RNA (rRNA)?

1 chloroplast

2 mitochondrion

3 nucleus

4 A rough endoplasmic reticulum

• 1, 2, 3 and 4

• 1, 2 and 3 only

• 1, 2 and 4 only

• 2, 3 and 4 only

A cell structure in the macrophage destroys bacteria. Some bacteria stop this cell structure from functioning. Which cell structure in the macrophage is stopped from functioning by the bacteria?

• Golgi body

• lysosome

• ribosome

• vesicle

The actual length of a cell structure is 8 µm. Which steps are used to calculate the magnification of an electron micrograph of this cell structure?

step 1 measure the length of the cell structure image on the micrograph in centimetres

step 2 measure the length of the cell structure image on the micrograph in millimetres

step 3 divide the image length by 1000

step 4 multiply the image length by 1000

step 5 divide by 8

step 6 multiply by 8

• steps 1, 3 and 6

• steps 1, 4 and 6

• steps 2, 3 and 5

• steps 2, 4 and 5

A student calibrated the scale on an eyepiece graticule in the eyepiece lens of a light microscope. The student was given a stage micrometer scale to use. The divisions on the stage micrometer scale were 0.1 mm apart. Which data must the student collect in order to calibrate the eyepiece graticule?

1 magnification of the eyepiece lens of the microscope

2 number of divisions of the stage micrometer scale seen in one field of view of the microscope

3 number of divisions of the eyepiece graticule scale equivalent to each division of the stage micrometer scale

• 1 and 3

• 2 and 3

• 2 only

• 3 only

Four students were asked to match the function with the appearance of some cell structures in an animal cell. The functions were listed by a number.

1 organizes microtubules to produce the spindle during cell division

2 synthesis of polypeptides

3 synthesis of lipids

The appearances were listed by a letter.

V membranes which surround an enclosed inner cavity

W non-membrane bound, spherical structures

X a double membrane interspersed with pores

Y non-membrane bound, cylindrical structures

Z membrane-bound sacs, arranged as a flattened stack

Which student correctly matched the numbered functions with the appearance of the cell structure?

• A

• B

• C

• D