What four (4) features do cells possess (see Definition of a Cell)? 1. bound of the surface of a phospholipid bilayer (plasma membrane) that provides a selectively permeable barrier. 2. gathers raw materials and uses it as building blocks and free energy. 3. heritable genetic code 4. can divide and...
Bio 2420 Quiz 2 Questions and Correct
Answers
What four (4) features do cells possess (see Definition of a Cell)? ✅1. bound of the
surface of a phospholipid bilayer (plasma membrane) that provides a selectively
permeable barrier.
2. gathers raw materials and uses it as building blocks and free energy.
3. heritable genetic code
4. can divide and reproduce
What is the approximate size (you can use diameter) of a typical human cell? ✅20 um
How can adult skeletal muscle fibers be considered single cells, when they contain so
many nuclei? ✅they are bounded by a single plasma membrane
True of False?
The 'striations' (or stripes) of skeletal and cardiac muscle cells can be observed with the
unaided eye. ✅false, you need a microscope
Bacteria and Archaea are both considered to be _________________ cells. (Eucaryotic
or procaryotic?) ✅procaryotic
True or False?
The cytosol of a liver cell contains numerous different intracellular compartments, and
also significant 'empty space'. ✅False, organelles are tightly packed in cytosol
The liquid portion of the cytoplasm is known as the __________________. ✅cytosol
The cytoplasm of a eucaryotic cells contains both _____________ and
______________. ✅organelles and cytosol
The phospholipid bilayer on the surface of a cell is known as the _____________
___________. ✅Plasma membrane
Cellular phospholipid bilayers have a fluidity similar to __________ _______ at room
temperature. ✅olive oil
Where are most of a cell's phospholipid bilayers located? ✅intracellular
Cell membranes (phospholipid bilayers) are composed of approximately ______ % lipid
and ______ % protein. ✅50,50
, A molecule that contains both hydrophilic and hydrophobic regions is called an
__________________ molecule. ✅phospholipid
How many non-polar (hydrophobic) hydrocarbon tails do individual phospholipid
molecules that form cellular bilayers possess? Why do they have this number of
hydrocarbon tails? What's the functional reason? ✅2, so they create planar bilayers to
separate intracellular compartments
(if it had one tail it would create a micelle)
Which region(s) of a cellular membrane phospholipid can form hydrogen bonds with
water molecules? ✅hydrophilic
A water-based solution is known as an _____________ solution. ✅aqueous
Yes or No: Is the cytoplasm an water-based solution? ✅yes
Yes or No: Is the extracellular fluid (the fluid directly outside of a cell) a water-based
solution? ✅yes
What is the significance of having at least one double bond (= unsaturated chemical
bond) in one of the hydrocarbon tails of a cell membrane phospholipid molecule? ✅to
prevent close packing of adjacent phospholipid molecules.
influence membrane fluidity
20.) Name and correctly spell the four (4) most abundant phospholipid molecules
present in mammalian plasma membrane. ✅1. phosphatidyl-ethanolamine
2. phosphatidyl-serine
3. phosphatidyl-choline
4. sphingomyelin
Which of the above phospholipid molecules are concentrated within the cytosolic
monolayer of the plasma membrane? ✅1. phosphatidyl-ethanolamine
2. phosphatidyl-serine
Which of the above phospholipid molecules are concentrated with the extracellular
monolayer of the plasma membrane? ✅1. phosphatidyl-choline
2. sphingomyelin
True or False? Glycolipids (the blue-colored molecules) are confined to cytosolic
monolayer of the plasma membrane? ✅false
What specific function(s) is/are cholesterol thought to perform within a cell membrane
phospholipid bilayer? ✅regulate temperature (buffer)
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