Ch.6 A tour of the cell
The endosymbiont theory explains the origins of __________.
mitochondria and chloroplasts
The extracellular matrix of the animal cell has all of the following molecular components except ....
A middle lamella
Which of the following choices matches a tool and it's proper application?
Cell fractionation to study the function of specific organelles.
The organelle that is a plant cell's compartment for the storage of inorganic ions such as potassium and chloride is the __________.
Central vacuole
Which of the following is false in respect of cells' chromosomes?
Chromosomes are only visible as a cell is about to divide
Which statement about the cytoskeleton is true?
Components of the cytoskeleton often mediate the movement of organelles within the cytoplasm.
In terms of cellular function, what is the most important difference between prokaryotic and eukaryotic cells?
Eukaryotic cells are compartmentalized, which allows for specialization.
A protein that ultimately functions in the plasma membrane of a cell is most likely to have been synthesized __________.
In the rough ER
The walls of plant cells are largely composed of polysaccharides and proteins that are synthesized.....
In the rough endoplasmic reticulum and in the Golgi apparatus.
The network of fibers that organizes structures and activities in a cell.....
Is the cytoskeleton
Cilia and flagella move due to the interaction of the cytoskeleton with which of the e following?
Motor proteins
The endoplasmic reticulum is part of the endomembrane system , which also include the ......
Nuclear envelope, the Golgi apparatus, lysosomes, vesicles
The region of a bacterial cell that contains the genetic material is called the __________.
Nucleoid
....... Are membrane bound metabolic compartments that specialize in the production of hydrogen peroxide and it's conversion to water.
Peroxisomes
Which of the following groups is primarily involved in synthesizing molecules needed by the cell?
Ribosomes, rough endoplasmic reticulum, and smooth endoplasmic reticulum
What is the functional connection between the nucleolus, nuclear pores, and the nuclear membrane?
Subunits of ribosomes are assembled in the nucleolus and pass through the nuclear membrane via the nuclear pores.
Evidence that supports the prokaryotic origins of mitochondria and chloroplasts are all of the following except .....
That mitochondria and chloroplasts have multiple copies of linear DNA molecules associated with their inner membranes.
Your intestine is lined with individual cells. No fluids leak between these cells from the gut into your body. Why?
The intestinal cells are bound together by tight junctions.
Animal cells have unique organelles called __________ that are composed of structures called __________.
centrosomes; centrioles
Basal bodies are most closely associated with which of the following cell components?
cilia
Bacterial cells are prokaryotic. Unlike a typical eukaryotic cell they __________.
have no membrane-bounded organelles in their cytoplasm
Observing a fluorescent micrograph cell with intermediate filaments would help you identify the cell as a __________.
human skin cell
Microfilaments function in cell motility including ____.
muscle contraction, amoeboid movement, and cytoplasmic streaming in plants
Cells are small because
of the geometric relationships between surface and volume
A substance moving from outside the cell into the cytoplasm must pass through __________.
plasma membrane
Dye injected into a plant cell might be able to enter an adjacent cell through __________.
plasmodesmata
Cell junctions in plant cells are called __________, and communicating junctions in animal cells are called __________.
plasmodesmata; gap junctions
Which of the following is present in a prokaryotic cell?
ribosome
You would expect a cell with an extensive Golgi apparatus to __________.
secrete a lot of protein
The function of the rough endoplasmic reticulum (RER) is __________.
to synthesize proteins that are secreted as glycoproteins
Beginning within the nucleus, the first step leading to the synthesis of a polypeptide is _____.
transferring of information from DNA to messenger RNA
Cell motility, which includes changes both in cell location and in the movement of cell parts, requires interactions of the cytoskeleton __________.
with motor proteins
