WorksheetsLiving Environment Midterm Exam*
Total questions: 20
Worksheet time: 55mins
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What is one characteristic of a biofilm?
presence of tubes to transport materials into and out of the colony
presence of nervous system for communication within the colony
ease with which colonies can be broken down by detergents
lack of resistance of the bacterial colony to antibiotics
Which statement best describes Psuedomonas aeruginosa bacteria?
They cause mutations humans.
They are easy to control.
They cause major infection problems in hospitals.
They are deadly only to people with cystic fibrosis.
Bacteria that form biofilms may be controlled most effectively by
antibiotics
detergents
cutting the tubes through which the bacteria communicate
blocking the expression of a gene that helps the colonies to organize
Scientist have corrected the damaged genes that cause typhoid fever and other infectious diseases.
Public health officials have placed better controls on the use of the toxic substances that cause these diseases.
Typhoid fever, like most other bacterial disease, is often caused by a lack of proper nutrition.
Personal habits, such as hand washing, have greatly reduced contamination from bacteria.
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An adaptive advantage that some types of bacteria have is their
ability to cause disease
resistance to certain antibiotics
ability to secrete antibiotics
resistance to certain infections
What usually happens when nonresistant bacteria die due to presence of antibiotics?
Resistant bacteria become nonresistant.
Treatment of bacterial infections becomes unnecessary.
Infections in livestock do not occur.
Resistant bacteria increase in number.
A person with AIDS is likely to develop infectious diseases because the virus the causes AIDS
destroy cancerous cells
damages the immune system
increases the rate of antibody production
increase the rate of microbe destruction
Certain bacteria produce a chemical that makes them resistant to penicillin. Since these bacteria reproduce asexually, they usually produce offspring that
can be destroyed by penicillin
mutate into another species
are genetically different from their parents
survive exposure to penicillin
Salmonella bacteria can cause humans to have stomach cramps, vomiting, diarrhea, and fever. The effect these bacteria have on humans indicates that Salmonella bacteria are
predators
pathogenic organisms
parasitic fungus
decomposers
Which characteristic is necessary for natural selection to occur to species?
stability
variation
complex cellular organization
a very low mutation rate
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