Ch 4 Exam
Which of the following statements is false?
All cells are shaped like cubes or are round.
What part does SRP (signal recognition protein) play in the binding of ribosomes to the endoplasmic reticulum?
SRP binds first to the signal peptide on the polypeptide being synthesized and then to a receptor on the ER which opens a channel.
Eukaryotic cells are different from prokaryotic cells in which of the following ways?
The variety of organelles and their complexity.
As cells increase in size, which of the following occurs?
There will be a greater increase in volume than in the surface area of the cell.
The smallest living unit is a
cell
The outermost boundary of prokaryotic cells is their
cell wall
Large storage structures typically found in the center of plant cells are ______.
central vacuoles
Which of the following will NOT be found in abundance in an insulin-producing pancreas cell?
chloroplasts
Debris that is trapped in mucus is moved away from the lungs toward the throat by _____.
cilia
The infoldings of the inner membranes of mitochondria provide an increase in surface area and are important in ATP production during cellular respiration. Name these structures.
cristae
Sperm cells move by means of
flagella
The stacks of membrane disks containing chlorophyll in a chloroplast are the ______.
grana
Which of these organelles contain hydrolytic enzymes responsible for intracellular digestion?
lysosomes
The description "9+2 array" in cells refers to _______.
microtubules
Skeletal muscle cells will have a large number of ______ due to their high demand for energy.
mitochondria
A dark-staining, spherical body found in the nucleus that produces ribosomal subunits is a ______:
nucleolus
All cells contain the following structures except ______.
nucleus
Protein synthesis in bacterial cells is performed by
ribosomes
Synthesis of lipids occurs in which major organelle?
smooth endoplasmic reticulum
The endosymbiotic theory explains _____.
the origin of chloroplasts and mitochondria
