Purdue BIOL 221 Spring 2025 Exam 1 MCQs Questions And Answers Rated 100% Correct
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Course
Purdue BIOL 221
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Purdue BIOL 221
In Pasteur's famous experiment that finally disproved spontaneous generation, bacteria
grew____.
A. Only in the flasks with a swan neck.
B. Only in media that came into contact with air.
C. Only in media that came into contact with other bacteria.
D. Only once the media had been boiled.
E. In...
Purdue BIOL 221 Spring 2025 Exam 1
MCQs
In Pasteur's famous experiment that finally disproved spontaneous generation, bacteria
grew____.
A. Only in the flasks with a swan neck.
B. Only in media that came into contact with air.
C. Only in media that came into contact with other bacteria.
D. Only once the media had been boiled.
E. In all flasks, regardless of how they were treated experimentally. - ✔️✔️C. Only in
media that came into contact with other bacteria.
There is must interest in using bacteriophages to kill the bacteria that cause infectious
diseases in humans. Which of the following is a valid concern about such therapy?
A. The bacterial viruses might also infect humans.
B. The bacterial viruses might carry bacterial DNA into human cells.
C. Bacterial viruses might mutate into uncontrollable "superbugs".
D. The virus preparation might be contaminated with a few live bacterial cells.
E. The viruses might evolve into new bacterial cells. - ✔️✔️D. The virus preparation
might be contaminated with a few live bacterial cells.
What are prions?
A. Infectious proteins with no nucleic acid.
B. Very tiny virus-like particles.
C. Infectious RNA with no protein.
D. Peptidoglycan particles that affect the immune system.
E. Small cells that lack a cell membrane. - ✔️✔️A. Infectious proteins with no nucleic
acid.
, What happens when water hydrates itself?
A. Molecules stick together and become cohesive.
B. It expands and freezes.
C. It cannot be transported through aquaporins anymore.
D. H3O+ and OH- ions form.
E. Water cannot hydrate itself. - ✔️✔️D. H3O+ and OH- ions form.
6. Rank the following lipids in order from MOST SOLID to LEAST solid at room
temperature.
E. MOST SOLID (2) > (1) > (3) LEAST SOLID - ✔️✔️C. MOST SOLID (1) > (3) > (2)
LEAST SOLID
This reaction is an example of ___________.
(check midterm exam 1 on brightspace for the picture I couldn't add it in)
A. Hydrolysis
B. Oxidation
C. Reduction
D. Condensation
E. Transpeptidation - ✔️✔️A. Hydrolysis
The pH inside bacterial cells is 7. The pH outside is 5. What is the size of the H+
gradient?
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