Lecture Exam 1

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Question #1

Which of the following BEST describes what the RO (R naught) value represents?

A number of incidences

B none of these is correct

C infection rate

D more than one of the choices are correct

E number of prevalence

F death rate

Question #2

An element’s reactive electrons are found in the shell the furthest away from its nucleus. Which of the following is the name of the shell that meets this description?

A valence electrons

B octet electrons

C reactive electrons

D inert electrons

Question #3

Suppose you have a bacterium that you find in a hot water spring that has a pH of 8.5. Your lab partner misunderstands your notes and changes the pH of the culture medium with this organism in it, to pH 5.5. Which of the following choices indicates how many more TIMES ACIDIC the new pH 5.5 solution is relative to what it originally was (8.5)?

A 10 times more acidic

B 100 times more acidic

C 3 times more acidic

D 30 times more acidic

E 1000 times more acidic

Question #4

Which of the following BEST describes Lavoisier’s Law of Conservation of Mass?

A energy and matter is neither created nor destroyed in physical or chemical processes.

B energy is neither created nor destroyed in physical or chemical processes.

C matter is neither created nor destroyed in physical or chemical processes.

D neither energy and matter can be created and destroyed in physical or chemical processes.

Question #5

Which of the following MUST all microorganisms do, in order to become resistant to antibiotics designed to kill them?

A none of these is correct

B change the microorganismâ s targeted cell structure

C increase the pH so that the antibiotic does not work

D change the antibiotic structure so that it cannot function

E more than one of the choices are correct

F move to a new location where there is no antibiotic

Question #6

Which of the following statements regarding past pandemics and the current SARS-COV2 (COVID 19) pandemic is CORRECT?

A they only affect poor, less affluent countries

B ignorance almost always makes them worse

C they usually end with very minimal loss of human life

D social isolation never makes them go away

Question #7

In our discussions, we described the Infectious Diseases Stage curve. Once infected with a pathogen, which of the following stages MAY NOT be experienced by all of your patients?

A decline

B more than one of the choices are correct

C incubation

D prodromal

E illness

F convalescence

Question #8

Which of the following statements about Case Fatality Ratio is CORRECT?

A refers to the proportion of living cases among those that have the disease

B is exactly the same for every infectious outbreak in recent history

C refers to the number of people an infected person will infect with the virus

D refers to the proportion of fatal cases among those that have the disease

Question #9

Which of the following best describes water droplet transmission?

A transmitting infectious water droplets through sweating

B more than one of the choices are correct

C none of these is correct

D transmitting infectious water droplets through sneezing

E transmitting infectious water droplets through laughing

F transmitting infectious water droplets through the rain

Question #10

All of the following are sources of INDIRECT host-to-host infection transmission EXCEPT:

A towels

B needles

C more than one of the above is correct

D human hands

E door handles

F none of these is correct

Question #11

Which of the following BEST defines what a zoonosis is?

A an infection that spreads from an animal to a human

B an infection that spreads between two humans

C an infection whose spread cannot be controlled

D an infection the spreads in a hospital

Question #12

Redi was the first microbiologist to cast doubt upon Aristotle’s spontaneous generation theory. His positive control was an open beaker with meat in it and his negative control was a tightly sealed beaker. Which of the following BEST describes Rediâ s experimental flask?

A a Swan necked flask

B a flask that was open for one week and sealed for another week

C a flask with a gauze covering

D a flask that was sealed and turned upside down

Question #13

According to CDC 2014 Ebola Virus out-break data, the total number of deaths resulting from Ebola virus was 11301. The fatalities occurred in the neighboring countries Guinea, Sierra Leone, and Liberia. Geographically, these countries are very close together on the same continent and are not considered global. Which of the following terms BEST describes the distribution of the 2014 Ebola out-break?

A endemic

B epidemic

C pandemic

D sporadic

Question #14

Needham and Spallanzani conducted essentially the same experiment but generated different results and drew different conclusions. Which of the following BEST describes why they got different results?

A Spallanzani covered his flasks with gauze before boiling

B Needham covered his flasks with gauze after boiling the media

C Needham did not cover his flasks after boiling the media

D Spallanzani did not cover his flasks after boiling the media

Question #15

Which of the following BEST describes why the Nobel Gases like argon, neon, and radon considered to be unreactive elements?

A their outer shell is full of electrons

B their outer shell is full of protons

C their outer shell is full of neutrons

D their outer shell is full of atoms

Question #16

Which of the following pH measurements would be considered acidic?

A 7.5

B 1.5

C 7

D 8

E 14

Question #17

Which of the following is the BEST describes an infectious disease VECTOR?

A an infected host organism

B a place the microbe resides during an infection.

C a place for the microbe to live before and after infection.

D the animal or object that transmits the infectious disease to humans

Question #18

Which of the following is the correct sequence of a disease process?

A incubation, convalescence, prodromal period, illness, decline

B prodromal period, convalescence, incubation, illness, decline

C incubation, prodromal period, illness, decline, convalescence

D convalescence, incubation, prodromal period, illness, decline

E illness, convalescence, incubation, prodromal period, decline

Question #19

Which of the following statements is the BEST description of biogenesis?

A oxygen is necessary for living organisms

B nonliving matter gives rise to living organisms

C Microorganisms can be generated for nonliving matter

D living cells can only arise from preexisting living cells

Question #20

Which of the following is the most frequently used pathogen portal of entry?

A the respiratory tract

B the placenta

C the digestive tract

D the eyes and skin

E the urinary tract

Question #21

Which of the following describes a pathogen’s typical location site or natural habitat, where it often resides during and after an infection outbreak event?

A reservoir

B source

C hot zone

D vector

Question #22

Which of the following describes a symbiotic relationship whose interactions are always HARMFUL to the host?

A mutualism

B commensalism

C parasitism

D pathogenicity

Question #23

Which of the following did proponents of spontaneous generation believe was necessary for spontaneous generation to occur?

A cells

B bacteria

C air

D disease

Question #24

Which of the following terms specifically means “disease” ?

A incidence

B mortality

C prevalence

D morbidity

Question #25

The outcome of most host-parasite relationships depends on which of the following?

A the virulence of the organism

B all of these are correct

C none of these are correct

D the host’s defenses or degree of resistance

E the number of microorganisms infecting the host

Question #26

Which of the following Koch postulates presents ethical challenges for human infectious disease research?

A the microorganism must be isolated in pure culture

B the isolated organism must be inoculated in a human and cause disease

C the organism must be isolated in pure culture from the lab animal

D the organism must be isolated in all cases of disease

Question #27

Which of the following is the BEST definition of a pathogen?

A a microbe that causes disease in humans

B a parasite that infects dogs

C a virus that does nothing to humans

D a parasite that kills its host

Question #28

Which of the following describes those infections that spread through or within a clinical setting?

A nosocomial infections

B community infections

C social infections

D vector-borne infections

Question #29

Which of the following BEST describes the difference between chemically reactive and chemically unreactive elements?

A the number of neutrons in the outer valence shell

B none of these

C the number of protons in the outer valance shell

D the number of electrons in the outer valence shell

E all are correct

Question #30

Which of the following terms describe organisms who are ubiquitously found in nature, but that cause disease only in individuals whose defenses are somehow weak or compromised?

A common source

B nosocomial

C opportunistic

D partial

Question #31

Which of the following describes the type of bond between NaCl?

A hydrogen bond.

B ionic bond.

C polar-covalent bond.

D non-polar covalent bond

Question #32

Which of the following term describes resistance of a population to infection and pathogen spread due to preexisting population immunity?

A threshold immunity

B vicarious immunity

C resistance effect

D herd immunity

Question #33

Which of the following BEST describes a pathogen’s entry site?

A penetration point

B lethal point

C portal of entry

D infectious point

Question #34

Which of the following Infection Stages describes what happens IMMEDIATELY before AND after the prodromal period?

A time of infection and recovery

B appearance of clinical symptoms and death

C the initial infection and appearance of clinical symptoms

D the time of infection and death

Question #35

Which of the following describes primary purpose of Koch’s postulates?

A develop vaccines for specific diseases.

B demonstrate that a disease is caused by a specific microorganism.

C clearly identify and characterize a particular microorganism.

D isolate microorganisms from diseased animals.

Question #36

Which of the following factors play a key role in likelihood of spreading infectious disease?

A environmental conditions

B human behavior

C genetic profile

D all of these

Question #37

Strontium (ST) has five periods, an atomic number of 38 and is in group 2. Which of the following is strontium’s electron count?

A 2, 8, 18, 8, 2

B 2, 8, 18, 8, 5

C 2, 8, 18, 2

D 2, 8, 18

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