Pre-quiz 1 (administered via Blackboard)
Pre-quiz 2 (administered via Blackboard)
Formative Assessment A (administered on Day 2 using Socrative)
_____ 1. One difference between prokaryotic and eukaryotic cells is that only eukaryotic cells
possess
(A) membrane-bound organelles
(B) DNA
(C) ribosomes
(D) cytoplasm
_____ 2. Many of the organelles in cells are studied together as part of the endomembrane
system because
(A) all of the organelles that make up this system are produced in the nucleolus
(B) the membranes of these organelles are made of a phospholipid bilayer while
other organelles are made of only a monolayer
(C) the organelles in this system are connected structurally or by the transfer of
membrane vesicles
(D) together, the organelles of this system are responsible for all of the dehydration
synthesis and hydrolysis that occurs in the cell
_____ 3. Pores in the nuclear envelop are necessary to permit the transport of
(A) DNA into the endoplasmic reticulum
(B) RNA into the endoplasmic reticulum
(C) large polysaccharide molecules into the nucleus
(D) membrane vesicles into the nucleus
Formative Assessment B (administered on Day 3 using Socrative)
_____ 1. Evidence to suggest that the chloroplast is descended from an organism that once
lived independently includes the fact that
(A) chloroplasts are the only organelles capable of directing photosynthesis
(B) chloroplasts are a major part of the endomembrane system
(C) there is a separate Golgi apparatus inside of most chloroplasts
(D) chloroplasts contain their own DNA and ribosomes
_____ 2. Integral proteins are unlikely to pop out of a membrane because
(A) they form a layer between the layers of phospholipids
(B) they are chemically bound to the phospholipids
(C) they are folded so that hydrophobic amino acids are exposed on the inside of the
membrane and hydrophilic enzymes are exposed on the inner and outer surfaces
(D) most of these proteins are connected to the ER with microtubules
_____ 3. Which of the following statements about a lipid bilayer is true?
(A) The lipid composition of the inner and outer layer is always the same.
(B) It is easy for phospholipid molecules to flip from one layer to the other.
(C) The position of proteins in a lipid bilayer is determined by where they start out
when they are produced on the ER membrane.
(D) Proteins move in and out of the bilayer freely.
Prior-Knowledge Activity A (pair/share)
 What cellular structures are visible in this image of a human cheek cells?
 What does this image tell us about the differences between prokaryotic and eukaryotic
cells?
 What cellular structures are visible in this image of Elodea cells?
 Note that the nucleolus is more obvious in some of these cheek cells than others. Now
that you know the function of the nucleolus, can you explain this?
Prior-Knowledge Activity B (pair/share)
 Note the similarities and differences between the mitochondria on the left and the
chloroplast on the right.
 Chlorophyll and other pigments are intramembrane proteins. So are many of the
proteins involved in respiration. How do these facts help explain the structure of the
mitochondria and the chloroplast?
https://youtu.be/BB5rvjZzgFU
cytoplasmic streaming in Elodea
https://youtu.be/PsYpngBG394
pseudopods in Amoeba
 How is the cytoskeleton involved in these two cellular processes?
Prior-Knowledge Activity C (pair/share)
 What did this early photomicrograph tell researchers about the structure of biological
membranes?
(A)
(B)
(C)
 What is different about each of the sections of membrane shown above?
 How might the difference between A and B affect the physical properties of the
membranes?
 Speculate on the nature of the small molecules present in C that are not present in A or
B. Are they hydrophobic or hydrophilic? How might they affect the physical properties
of the membrane?