BIOL 221 Final exam MCQ's Questions And Answers Rated 100% Correct
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Module
BIOL 221 MCQ\\\'s
Institution
BIOL 221 MCQ\\\'s
Rank the following lipids in order from MOST SOLID to LEAST solid at room
temperature.(1) Saturated lipids (2) Cis-unsaturated (3) Trans-unsaturated -
️️MOST SOLID (1) > (3) > (2) LEAST SOLID
What type of microscope measures electric current passing through a probe rather than
using p...
BIOL 221 Final exam MCQ's
Rank the following lipids in order from MOST SOLID to LEAST solid at room
temperature.(1) Saturated lipids (2) Cis-unsaturated (3) Trans-unsaturated -
✔️✔️MOST SOLID (1) > (3) > (2) LEAST SOLID
What type of microscope measures electric current passing through a probe rather than
using part of the electromagnetic spectrum? - ✔️✔️Atomic force
It was mentioned in an earlier lecture that science should be "predictive". What does
this mean? - ✔️✔️If you change a variable in an experiment, you know how the results
will change
In Pasteur's famous experiment that finally disproved spontaneous generation, bacteria
grew____. - ✔️✔️Only in media that came into contact with other bacteria.
What are prions? - ✔️✔️Infectious proteins with no nucleic acid.
What happens when water hydrates itself? - ✔️✔️H3O+ and OH- ions form.
This reaction is an example of ___________. (pictures one molecule breaking down into
two) - ✔️✔️Hydrolysis
The pH inside bacterial cells is 7. The pH outside is 5. What is the size of the H+
gradient? - ✔️✔️There are one hundred times as many protons outside the cell than
inside.
Humans cannot digest cellulose, though, bacteria can because
______________________. - ✔️✔️Humans cannot digest β-glycosidic bonds, but
bacteria can.
Which of the following amino acids does NOT have D- and L- stereoisomers? -
✔️✔️Glycine
What type of microscope views a specimen with light refracted from the specimen rather
than light that passed through the specimen? - ✔️✔️Dark field
Which of the following CANNOT participate in hydrogen bond formation? - ✔️✔️The H
in C-H
, In an environment that was isotonic to a bacterial cell's cytoplasm, what effect would
penicillin have on logarithmic phase Gram-positive round-shaped cells? - ✔️✔️The
cells would lose their shape.
What type of microscope uses special prisms to make a thin specimen appear pseudo-
3-dimensional? - ✔️✔️Differential interference contrast (Nomarski)
Refer to the diagram of peptidoglycan on the right. What is different between Gram-
negative and Gram-positive peptidoglycan? - ✔️✔️The structure marked "A" is only
found in Gram-positive cells.
What is the main advantage of using an electron beam rather than light to illuminate a
specimen? - ✔️✔️Electrons have a shorter wavelength than light.
What is one unique feature of the Mycobacterial cell wall? - ✔️✔️It contains a thick
layer of very dense lipids.
Which of the following is NOT true of the PTS (phosphotransferase) transport system? -
✔️✔️It involves the direct transfer of a phosphate from ATP to glucose.
What is the "Sec translocon"? - ✔️✔️A transporter that inserts proteins with a signal
sequence through the cytoplasmic membrane.
An organism with carboxysomes would be expected to be a _______________. -
✔️✔️Autotroph
A bacterium is growing in a medium with a [K+] of 1mM. The bacterium uses uniport to
accumulate K+ to a 10mM concentration inside the cell. What is the energy for this
transport - ✔️✔️The membrane potential.
Which of the following is NOT a function of capsules or slime layers? - ✔️✔️Motility
Why are scientists interested in Type III secretion systems? - ✔️✔️They are often
associated with insertion of toxins directly into eukaryotic cells.
Volutin (metachromatic) granules are used to store __________. - ✔️✔️Phosphate
Tubes 1-5 represent growth in shake tubes with thioglycolate media. Which of the
following is trueof the organisms growing in Tube 5? - ✔️✔️They use O2 as a terminal
electron acceptor.
How are pili involved in bacterial motility? - ✔️✔️They are extended and retracted like
grappling hooks.
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