Short Quiz 1 CH (1-5)

The microorganims that usually live on or within a person are collectively referred to as

• nonpathogens

• germs

• indigenous microflora

• opportunistic pathogens

Microorganisms that live on dead and decaying organic material are known as

• pathogens

• indigenous microflora

• saprophytes

• parasites

Which of the microorganisms are considered obligate intracellular pathogens

• rickettsias, chlamydias, and viruses

• mycobacterium tuberculosis and viruses

• mycobacterium leprae and Treponema pallidum

• chlamydias, rickettsias, mycobacterium leprae, and treponema pallidum

Which of the following are even smaller than viruses?

• chlamydias

• cyanobacteria

• rickettsias

• prions and viroids

What is the total magnification when using the high-power (high-dry) objective of a compound light microscope equipped with a x 10 ocular lens?

• 100

• 40

• 50

• 400

The limiting factor of any compound light microscope (i.e., the thing that limits its resolution to 0.2 um) is the:

• number of magnifying lenses it has

• wavelength of visible light

• number of ocular lens it has

• number of condenser lenses it has

A compound light microscope differs from a simple microscope in that the compound light microscope contains more than one:

• condenser lens

• magnifying lens

• objective lens

• ocular lens

How many times better is the resolution of the transmission electron microscope than the resolution of the unaided human eye?

• 10,000

• 1,000,000

• 1,000

• 100,000

Molecules of extrachromosomal DNA are also known as:

• lysosomes

• plasmids

• plastids

• golgi bodies

One way in which an archaean would differ from a bacterium is that the archaean would posses no

• DNA in its chromosome

• peptidoglycan in its cell walls

• ribosomes in its cytoplasm

• RNA in its ribosomes