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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Question: Which of the following items is not required labeling component on a patient sample?
Choices:
2 unique patient identifiers
Patient date of birth
Collection time
Patient SSN
Question: In order to recover all potential pathogens that could be found in CSF, which media must be included in the culture setup?
Choices:
CHOC
BAP
MAC
THIO
Question: Choose the gram staining step that does not make sense.
Choices:
Primary staining is performed by using crystal violet
The time that the mordant remains on the slide is not critical
Decolorization is a critical step, and if improperly performed can result in poor staining quality.
Safranin is a secondary or counterstain
Question: Choose the media that is considered to be both selective and differential.
Choices:
CHOC
BAP
CAMPY
CNA
Question: Based upon the following description, what is the first biochemical test that should be performed on the colony in order to reach an identification? The culture site is a wound from the lower leg. Heavy growth on CHOC with a golden color Heavy beta hemolysis on BAP Colonies are opaque and white to golden in color No growth on MAC
Choices:
Coagulase
Catalase
FOX disk
A disk
Question: Which of the following media will optimaly facilitate the growth of GP and GN organisms?
Choices:
MAC
HE
BAP
All media listed
Question: Fastidious organisms tend to require which type of environmental condition more than the others?
Choices:
Aerobic
Anaerobic
Capnophilic
Microaerophilic
Question: Choose the correct gram stain results for Streptococcus pneumoniae.
Choices:
GNDC
GPC chains
GPDC
GNCB
Question: Choose the most likely pathogen from a sputum sample.
Choices:
Streptococcus pneumoniae
Staphylococcus aureus
Escherichia coli
Neisseria meningitidis
Question: With regard to bacteria, which of the following is NOT a nutrient or resource required for optimal growth?
Choices:
Source of ATP
Source of Carbon
Source of Nitrogen
Proper pH
Question: In order to count the number of colonies growing on a urine culture, which method of plating must be chosen?
Choices:
Quantitative
Qualitative
Isolation
Any listed