Bio Ch. 4
Peroxisomes are organelles that are involved in the _____.
breakdown of fatty acids
The purpose of cellular respiration is the production of _____.
ATP
Phospholipid bilayer membranes are semipermeable. Which of the following can move across the membrane without assistance?
O₂
Which of the following is the most likely consequence for a cell lacking functional lysosomes?
The cell becomes crowded with undigested wastes.
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.
A certain cell has a dense nucleoid region, ribosomes, but no membrane-enclosed organelles. Based on this information, it could be ________.
an archaean
Which of the following would be found in the cytoplasm of a eukaryotic cell?
centrioles
Which cellular organelle is required for photosynthesis to occur in eukaryotic cells?
chloroplast
Under a light microscope, which substance becomes visible as the cell divides?
chromatin
Basal bodies are most closely associated with which of the following cell components?
cilia
What are the inner folds of the mitochondria called?
cristae
Where are the ribosomes that produce enzymes responsible for the first steps of sugar metabolism found?
cytoplasm
Where would you expect to find contractile proteins in a cell?
cytoskeleton
Cilia and flagella move due to energy provided by the enzymatic breakdown of ATP by _____.
dynein arms
The contractile vacuole _____.
eliminates excess water from the cytoplasm of freshwater protists
Which of the following structures is directly involved in the passage of electrical signals between cells as, for example, in the vertebrate heart?
gap junctions
Mitochondria and chloroplasts are similar in that they both _____; they are different in that chloroplasts, but not mitochondria, _____.
have a double membrane ... carry out photosynthesis
The maximum size of a cell is limited by ________.
its need for enough surface area to make exchanges with its environment
Bacterial cells are prokaryotic; unlike a typical eukaryotic cell, they _______.
lack a nucleus
Primary ciliary dyskinesia is a genetic disorder in which the cilia of the respiratory tract become immobile. As a result, these individuals suffer respiratory illnesses. This is because the cells _____.
lack dynein arms
The nucleolus _________.
manufactures ribosomes
The rough endoplasmic reticulum is considered to be in which general functional category of organelle?
manufacturing
Mitochondria appear in the greatest numbers in cells that are _____.
metabolically active
The protein actin is a component of a(n) _____.
microfilament
Integrins are proteins that are responsible for integrating changes that are occurring outside and inside the cell. They are able to do this because of _____.
microfilaments
The internal skeleton of a cell is composed of _____.
microtubules, intermediate filaments, and microfilaments
Which of these is a function of the endomembrane system?
molecule export
A plant cell was grown in a test tube containing radioactive nucleotides, the monomers from which DNA is built. Later examination of the cell showed the radioactivity to be concentrated in the _________.
nucleus
Most of the DNA in a eukaryotic cell is in the _________.
nucleus
Digestive cells produce many enzymes that break down ingested food. These cells have a large number of ribosomes ________.
on the rough endoplasmic reticulum
The general function of _____ is the breakdown of substances.
peroxisomes
Chloroplasts are found in _____.
plant cells and some protists
Dye injected into a plant cell might be able to enter an adjacent cell through a(n) _____.
plasmodesma
The cell junctions in plant cells that provide channels between adjacent cells are generally _____.
plasmodesmata
Which of the following are found in prokaryotic cells?
ribosomes
Which of the following structures is/are found in prokaryotic cells?
ribosomes
Of the following organelles, which group is involved in manufacturing the substances needed by the cell?
ribosomes, rough endoplasmic reticulum, smooth endoplasmic reticulum
Pancreatic cells secrete lots of proteins. With this in mind, which of the following organelles would be especially abundant in pancreatic cells?
rough endoplasmic reticulum
The architecture of cell surfaces can be viewed in the most detail using a _______.
scanning electron microscope
You would expect a cell with an extensive Golgi apparatus to _____.
secrete a lot of material
In muscle cells, the _______ is/are specialized for the storage and release of calcium.
smooth endoplasmic reticulum
When isolated liver cells are combined with toxins, initial processing in the _______ increases the solubility of those compounds as an initial step in their excretion.
smooth endoplasmic reticulum
What are the limits on which maximum cell size depends?
surface-to-volume ratio
Lysosomes are derived from _____ and function in _____.
the Golgi apparatus and rough endoplasmic reticulum ...digestion of worn-out organelles
The term resolving power refers to _______.
the clarity of the image in showing two objects as separate
Membrane proteins are synthesized by ribosomes that are attached to ________.
the endoplasmic reticulum
To enter or leave any cell, substances must pass through ________.
the plasma membrane
A normal size range for a typical eukaryotic cell is ________.
10 to 100 micrometers
A researcher made an interesting observation about a protein made by the rough endoplasmic reticulum and eventually used to build a cell's plasma membrane. The protein in the membrane was actually slightly different from the protein made in the ER. The protein was probably altered in the _____.
Golgi apparatus
When elongated, tube-shaped cells from the lining of the intestine are treated with a certain chemical, the cells sag and become rounded. The internal structures disrupted by this chemical are probably _____.
microtubules
