Normal Flora (microbioogy Btec-Unit 13)

Which term describes microorganisms that normally inhabit the body without causing disease?

• Pathogens
• Normal flora
• Parasites
• Virulent microbes

Which region of the human body is normally sterile?

• Skin
• Lower respiratory tract (lungs)
• Mouth
• Large intestine

The normal flora of the skin primarily consists of:

• Strict anaerobes
• Obligate pathogens
• Staphylococcus species
• Algae

Which part of the digestive tract contains the highest concentration of bacteria?

• Stomach
• Small intestine
• Large intestine
• Oesophagus

Lactobacillus species are mainly associated with which body site?

• Skin
• Mouth
• Vagina
• Lungs

Normal flora helps prevent infection by:

• Enhancing pathogen growth
• Competing with pathogens for nutrients
• Weakening the immune system
• Causing inflammation

Which of the following is a benefit of normal gut flora?

• Production of vitamin K
• Producing toxins
• Increasing pH
• Destroying villi

Which group of organisms is dominant in the large intestine?

• Viruses
• Fungi
• Anaerobic bacteria
• Protozoa

The presence of Candida albicans in small numbers in the mouth is an example of:

• Pathogenic infection
• Normal flora
• A viral infection
• A sterile environment

Which body site contains normal flora involved in dental plaque formation?

• Skin
• Mouth
• Stomach
• Ear canal