Chapter 3 Quiz
What is the difference between active and passive transport across the plasma membrane?
Active transport is ATP dependent, whereas passive transport uses only the kinetic energy of the particles for movement across the plasma membrane.
Which of the following is NOT a concept of the cell theory?
Cells are given life through a process known as spontaneous generation.
Phagocytosis is a form of exocytosis.
False
Which of the following is a difference between primary and secondary active transport?
In primary active transport, the transport protein gets phosphorylated; in secondary active transport, the transport protein is not phosphorylated.
Which of the following statements correctly describes the plasma membrane?
It is a dynamic fluid structure that is in constant flux.
What must happen before a body cell can begin mitotic cell division?
Its DNA must be replicated exactly so that identical copies of the cell's genes can be passed on to each of its offspring.
Use the figure to match the following functions. Drag the appropriate labels to their respective targets. Some targets will be left blank.
Left: 1.blank 2.blank 3. source of cell autolysis 4. Replicate for cell division (centrioles) Right: blank
Which of the following statements is correct regarding RNA?
Messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis
________ is the diffusion of a solvent, such as water, across a selectively permeable membrane.
Osmosis
Why is the selective permeability of the plasma membrane essential for normal cell function?
Selective permeability allows cells to exclude some substances and allow others to pass into or out of the cell.
Which of the following statements best explains why the leading and lagging strands are synthesized using two different mechanisms?
The DNA is replicated in one direction, but DNA polymerase must work in opposite directions on each parent strand.
Which of the following is FALSE regarding the membrane potential?
The resting membrane potential is maintained by solely by passive transport processes.
What is the primary function of the mitochondria?
They are the main sites of ATP production.
Lysosomes perform digestive functions within a cell.
True
The figure is of which cellular organelle?
a mitochondrion
A gene can best be defined as ________.
a segment of DNA that carries the instructions for one polypeptide chain
What is a membrane potential?
a voltage or electrical charge across the plasma membrane
Which of the following molecules might change over time in a cancer cell?
all of the above
Which letter is pointing to an mRNA molecule?
c
Which cell component helps to maintain the structural integrity of the cell?
cytoskeleton
The nucleolus ________.
is the site of ribosome assembly in a cell
Which of the following describes tight junctions?
junctions among epithelial cells lining the digestive tract
Which cell organelle provides the majority of the ATP needed by the cell to carry out its metabolic reactions?
mitochondrion
The indicated protein interacts with DNA to form the structural unit of chromatin called a ______.
nucleosome
Which of the following processes allows cells to concentrate material that is present only in very small amounts in the extracellular fluid?
receptor-mediated endocytosis
Which of the following factors act to bind cells together?
specialized junctions, wavy membrane contours, and glycoproteins
What major function occurs on the specific membranes indicated by A?
synthesis of secreted proteins
Which of the following is a function of the rough endoplasmic reticulum?
synthesis of the cell's membranes
What process allows for the production of molecule B from a template consisting of molecule A?
transcription
What are the two basic steps of polypeptide synthesis?
transcription and translation
