BIOS 242 Week 3 Quiz: Summer 2021
1. Question: An organism that uses CO2 for its carbon needs and sunlight for its energy needs
would be called a
... [Show More] ___________.
a) photoautotroph
b) halotroph
c) saprobe
d) chemoheterotroph
e) heterotroph
2. Question: An obligate saprobe differs from a parasite in that
A) a saprobe is a fungus, but a parasite can be any type of microbe.
B) a saprobe does not harm a host that it lives on, whereas a parasite does harm a host.
C) a saprobe cannot infect a human, but a parasite is always infectious.
D) a saprobe derive nutrients from dead plants and animals, but a parasite derives nutrients
from living plants and animals.
3. Question: Cultures of a bacteria strain were incubated in a refrigerator (5
oC), on a lab bench
(22
oC), in a 37
oC incubator, and in a 50
oC incubator. After incubation, there was no growth at
37
oC and 50
oC, slight growth in the refrigerator, and abundant growth on the lab bench top.
Which term best describes this organism?
Psychrophile
4. Question: A bacterium is inoculated into a tube of thioglycollate and incubated. After incubation,
turbidity appears throughout, top to bottom, with the greatest turbidity at the very top. This
bacterium would be called a(n) _________
facultative anaerobe
5. Question: The phase of the bacterial growth curve in t the rate of multiplication equals the rate of
cell death is the__________.
Stationary phase
6. Question: Enzymes are
7. Question: The bacterial genus Bacillus can utilize starch as a nutrient by splitting the starch
molecule into smaller molecules of glucose with the addition of water. The enzymes to do this
would be classified as _____.
hydrolases
8. Question: In bacteria cells, the electron transport system is located in the _______.
A.cell membrane.
9. Question: During which phase of cellular respiration is the majority of ATP formed?
Electron transport chain
10. Question: Sulfa drugs like Bactrim, given for bacterial infections, inhibit bacteria by blocking
folic acid synthesis. The precursor molecule of folic acid is para-amino benzoic acid (PABA).
Interestingly, PABA has a structure very similar to a sulfa drug. If a sulfa drug is present, the
bacterial enzyme will bind the sulfa drug because of structural similarity. This is an example of
________.
Competitive inhibition
11. Question: A permanent, inheritable change in the genetic information is called ___________.
a. translation [Show Less]