Micro Exam #2
Quiz by Darwin
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- Q1
Animal viruses can be grown in all of the following except?
Embryonated eggs
Tissue cultures
E.coli cells
Live animal hosts
HeLa cells
60s - Q2
Which of the following pathways are operations in a cell growing via fermentation?
Intermediate step only
Krebs cycle only
Glycolysis only
Glycolysis and intermediate step only
Glycolysis, intermediate step, and the Krebs cycle
60s - Q3
Extreme thermophile that live near thermal vents must have all of the following adaptation except?
Specialized chaperone proteins
Proteins that resists thermal denaturing
Plasma membrane lipids that are highly branched and saturated
They must also be barophiles
Plasma membrane lipids that are highly unsaturated
60s - Q4
Which of the following is characteristic of the lytic cycle?
Many bacterial cells containing viral DNA are produced
Viral DNA is incorporated into the host genome
A large number of phages are released at a time
The virus-host relationship usually lasts for generation
The viral genome replicates without destroying the host
60s - Q5
A sample of milk is tested for its bacterial content in a plate count assay. A one-milliliter sample of the milk is diluted in a 1:10 dilution series. One milliliter of the third dilution tube is plated in a pour plate. After incubation, the plate has 54 colonies, indicating that the original milk sample contained.
54 cells per milliliter
54,000 cells per milliliter
540,000 cells per milliliter
5,400 cells per milliliter
540 cells per milliliter
60s - Q6
Three cells with generation times of 60 minutes are inoculated into a culture medium. Assuming no lag phase phase takes place, how many cells are there after 5 hours?
900
96
180
32
15
60s - Q7
When bacteria use building for reproduction
Conidia form long hyphae extensions
The daughter cells are not genetically identical
The daughter cells are not equal in size
The bud forms as a way to survive unfavorable growth conditions
The daughter cells are produced by sexual reproduction
60s - Q8
Which statements correspond to amphibolic pathways?
I. Anabolic and catabolic reactions are joined through common
intermediate
II. They are shared metabolic pathways
III. Feedback inhibition can help regulate rates of reactions
IV. Both types of reactions are necessary but do not occur simultaneously
2,3,4
2,4
1,2,3,4
1 only
1,2,3
60s - Q9
Which statement shows an example of a commensal species in one host becoming a pathogenic species in another host?
C.difficle flourishes in the large intestine after antibiotic therapy
Shigella flexerni preferably infects the tissues of humans and other primates
Up to 30 percent of pregnant women harbor Group B streptococci in the vagina to no ill effect, but when transmitted to their newborns, a proportion of babies develop serious infection
E.coli lives harmlessly in the appendix but will be attacked by the immune system if it invades the abdominal cavity.
New infectious disease are due to an expansion in host tropism
60s - Q10
The bacterium that causes tuberculosis can be expelled from the lungs by a cough and remain viable in the air for an hour or more. If a person inhales the bacteria from the air, what type of transmission has occurred?
Indirect contact
Airborne
Bodily fluid
Waterborne
Foodborne
60s - Q11
Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
Glycolysis
Synthesis of acetyl CoA from pyruvate
Reduction of pyruvate to lactate
The electron transport chain
The citric acid cycle
60s - Q12
One of the ways that cells balance anabolism and catabolism is to
use feedback inhibition to shut down a pathway that is not needed AND use separate coenzymes such as NAD+ vs. NADP4 for catabolic vs. anabolic pathways.
use the same enzyme to run a reaction in both the catabolic and anabolic direction.
use the same enzyme to run a reaction in both the catabolic and anabolic direction AND use feedback inhibition to shut down a pathway that is not needed.
use feedback inhibition to shut down a pathway that is not needed.
use separate coenzymes such as NAD+ vs. NAD+ for catabolic vs. anabolic pathways.
60s - Q13
The incidence of tuberculosis in the year 2000 in the UnitedStates was 12.43/100,000 cases.
This means
12.43 of every 100,000 people died of tuberculosis in the United States in the year 2000.
12.43 of every 100,000 people in the United States had tuberculosis in the year 2000.
there were 12.43 new cases of tuberculosis for every 100,000people in the United States in the year 2000.
there were 12.43 tubercle bacilli per 100,000 microbes in the United States in the year 2000.
12.43 of every 100,000cases of tuberculosis were treated in the United States in the year 2000.
60s - Q14
The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is
water
ADP
oxygen
pyruvate
NAD+
60s - Q15
People who wash their hands frequently during cold season typically have fewer colds than those who do not. This observation suggests cold viruses can be transmitted by
fomites
direct contact
mechanical vectors
biological vectors
both direct contact and fomites
60s