Cell Microscopy(1)

A cell organelle measures 4x10^-1 mm in diameter. What is diameter in µm?

• 4x10¹µm

• 4x10²µm

• 4x10³µm

• 4x10⁵µm

Which of the following explains why mitochondria structure and function cannot be studied using a light microscope

• Mitochondria is enclosed by a double membrane
• Mitochondria size is too small for its internal structures to be magnified by the light microscope
• Mitochondria size is too small to for its internal structures to the resolved by a light microscope
• Mitochondria must be alive for it to be studied

which of these statements are true about the relative sizes of lysosomes and ribosomes?

• lysosomes are bigger in size
• lysosomes are smaller in size
• lysosomes are produced by ribosomes
• ribosomes are produced by lysosomes

the average lysosome has a size of 1.2µm and the average ribosome has a size of 25nm. How many ribosomes can be packed into a lysosome?

Student Philip was presented with the photomicrograph of a cell organell. The magnification of the photomicrograph is known. Which calculation of the actual length of the organelle in Um is correct?

• actual size in cm X 100 divided by magnification
• actual size in mm X 100 divided by magnification
• image size in cm X 1000 divided by magnification
• image size in mm X 1000 divided by magnification

The magnification of a diagram of a leaf is 210x. And the actual thickness of the leaf is 243µm. What is the thickness of the drawing in cm?

Plant cells are fixed, stained and viewed through a light microscope. What would be clearly visible at 400x magnification?

• Cristae of mitochondria
• grana of chloroplast
• nucleoli
• ribosomes

In which of the following is resolution increased?

• when you switch from a light microscope at 1500x magnification to an electron microscope at 1500x magnification
• when you switch from a light microscope with 150x magnification to another light microscope with 150x magnificataion
• when you switch from an electron microscope to a light microscope
• when you switch from the 40x objective to the 4x objective of a light microscope

As magnification is increased………….

• field of view increases, but resolution reduces
• field of view reduces, but resolution increases
• field of view reduces, but resolution remains the same
• field of view reduces and resolution reduces

which structure is measured in the units shown using a light microscope?

• cell surface membrane, nm
• cell wall, nm
• chloroplast, µm
• ribosome, µm