Biology Ch 5-8 Fifth edition Brooker BRCC 1033 Exam Practice Questions and Answers
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Course
Brooker Biology
Institution
Brooker Biology
Biology Ch 5-8 Fifth edition Brooker BRCC 1033
Exam Practice Questions and Answers
Describe the chemical composition of biological membranes? - ANSWER-Biological membranes are
bilayers of phospholipids with associated proteins and carbohydrates.
What can never be energetically favorable in a bi...
The tendency for Na+ to move into the cell can be due to - ANSWER✔✔-The higher numbers of Na+
outside the cell, resulting in a chemical concentration gradient. And the net negative charge inside the
cell attracting the positively charged Na+
Let's suppose the solute concentration inside the cells of a plant is 0.3 M and the concentration outside
is 0.2 M. If we assume that the solute does not readily cross the membrane, which of the following
statements best describes what will happen? - ANSWER✔✔-The plant cells will take up a little water, and
the plasma membrane will push against the cell wall.
What features of a biological membrane are major contributors to its selective permeability? -
ANSWER✔✔-phospholipid bilayer, transport proteins
What is the name given to the process in which solutes are moved across a membrane against their
concentration gradient? - ANSWER✔✔-active transport
Large particles or large volumes of fluid can be brought into the cell by - ANSWER✔✔-endocytosis.
How are phospholipids transferred to the leaflet of the ER membrane that faces the ER lumen? -
ANSWER✔✔-Figure 5.6 Phospolipids are transferred to the other leaflet of the ER membrane via
enzymes called flippases.
What structural feature of a polypeptide causes a region of it to form a transmembrane segment? -
ANSWER✔✔-Figure 5.7 The most common feature causing a transmembrane segment to form is a
stretch (about 20) of amino acids that mostly have hydrophobic (nonpolar) side chains.
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