Quiz 5 Question Pool
Cells specialized for secreting proteins should have extensive: A- Numbers of ribosomes B- Rough ER C- Golgi apparatus D- Genetic material E- Transport vesicles F- All of the above except B G- All of the above except C H- All of the above except D
H
All of the biological membranes are selectively permeable. A- True B- False
A
Both simple diffusion and facilitated transport occur down the concentration gradient. A- True B- False
A
Compared to oxygen, carbon dioxide has a greater solubility in the biological membranes of human; therefore we can expect that CO2 diffuses faster across membranes than O2. A- True B- False
A
Despite similarities between various components of the endomembrane system, they have different enzymes embedded in their phospholipid bilayer. A- True B- False
A
Flagella and cilia are the same in terms of: A- Their core structures B- Their patterns of movement C- Their lengths D- Their number in each cell
A
In-------, polymers are broken down into their building monomers by hydrolytic enzymes. A- Lysosomes B- Chloroplasts C- Mitochondria D- Endoplasmic reticulum
A
Majority of the proteins of the plasma membrane are transmembrane proteins that can span the membrane because: A- They consist of both hydrophilic and hydrophobic parts B- They consist of only polar amino acids C- They consist of only nonpolar amino acids D- They consist of only charged amino acids
A
No work must be done for passage of any substance that is able to dissolve in the lipid bilayer of the plasma membrane. A- True B- False
A
Production of sugars from inorganic materials including water and CO2 is a function that cannot be carried out in any of the structures of the animal cells. A- True B- False
A
Proteins of the plasma membrane have both functional and structural roles. A- True B- False
A
Simple diffusion of a substance across the cell membrane does not need any transport protein. A- True B- False
A
Sperm is the only human cell that has flagellum. A- True B- False
A
The difference between the cell membranes that surround various membranous structures is partially due to the kinds of proteins that are embedded in the phospholipid bilayer. A- True B- False
A
The plasma membrane has selective permeability. As a result, the molecular composition of the substance inside of a cell is different from that outside of the cell. A- True B- False
A
The plasma membrane has selective permeability. This means that some substances cross it more slowly than the others. A- True B- False
A
The solution inside a vacuole differs in composition from the cytosol. A- True B- False
A
The transmembrane proteins of the plasma membrane are amphipathic. A- True B- False
A
Which of the following can easily cross the plasma membrane via dissolving in the lipid bilayer? A- Small nonpolar substances like O2 and CO2 B- Large hydrophobic substances like sex hormones C- Large polar substances like sugars D- Charged amino acids E- Ions like K+
A
Which of the following matters the most for simple diffusion of a substance across the cell membrane? A- The size of the substance B- The polarity of the substance C- The physical form of the substance D- The number of double bonds within the substance
A
Which of the following modes of transport DOES NOT need a transport protein? A- Simple diffusion B- Facilitated diffusion C- Active transport D- Co-transport
A
"Passive transport" is defined as a type of transmembrane transport that does not need a transport protein. A- True B- False
B
-------is caused by excessive leakage from a large number of lysosomes and results in------. A- Phagocytosis........food digestion B- Autodigestion.......cell death C- Phagocytosis........cell death D- Hydrolysis......cell renewal
B
As various organic materials flow through different parts of the endomembrane system, their molecular composition, contents and functions remain fixed. A- True B- False
B
Both mitochondria and chloroplasts convert organic molecules to inorganic molecules to release energy. A- True B- False
B
Cellulose with a cable like structure is one of the components of the Extra Cellular Matix of animal cells. A- True B- False
B
Different components of the endomembrane system have different functions because the membrane that surrounds some of them is not made up of a phospholipid bilayer. A- True B- False
B
Diffusion of a substance across the cell membrane occurs down its concentration gradient only if the substance has small molecules. A- True B- False
B
One of the differences between simple diffusion and facilitated transport is that the former is a type of passive transport while the latter is an active transport. A- True B- False
B
Plasma membranes that are highly permeable to the substances that cross the membrane by simple diffusion are expected to have a larger proportion of saturated fatty acids. A- True B- False
B
Polymerization of actin monomers results in generation of: A- Microtubules B- Microfilaments C- Intermediate filaments D- The cell wall
B
Prokaryotic cells like bacteria use lysosomes to digest the macromolecules taken in as food. A- True B- False
B
Proteins that are embedded in the plasma membrane are originally synthesized in: A- The free ribosomes in the cytosol B- The ribosomes of rough ER C- The ribosomes of mitochondria D- The nucleus
B
Simple diffusion of a substance across the cell membrane mainly depends on the types of proteins that are embedded in the lipid bilayer. A- True B- False
B
Simple diffusion of a substance across the cell membrane may occur through a protein channel. A- True B- False
B
Simple diffusion of a substance across the cell membrane requires a carrier protein. A- True B- False
B
Small gas molecules like O2 and CO2 need their specific protein channels to cross the cell membrane. A- True B- False
B
The cell membranes of polar bears are different from the cell membranes of rattle snakes of Arizona deserts. That is because in polar bears plasma membranes are not fluid mosaics of lipids and proteins. A- True B- False
B
The major ingredient of the cell wall of plants is a polymer of certain polypeptides. A- True B- False
B
The nucleus contains a matrix whose molecular composition is similar to that of the lysosomes. A- True B- False
B
The plasma membrane can exist between two aqueous compartments (cytosol and extracellular fluid) because all parts of its structure are polar and hydrophilic. A- True B- False
B
The plasma membrane has selective permeability. This means that the phospholipids of the cytoplasmic layer can easily switch places with the phospholipids of the external layer. A- True B- False
B
The rough ER is so named because it has an abundance of -----------------on it. A- Golgi bodies B- Ribosomes C- Protein fibers D- Hydrolytic enzymes E- Vesicles
B
Transportation of almost all substances across the cell membrane requires energy. A- True B- False
B
Which of the following IS NOT a function of mitochondria? A- Energy conversion B- Glucose production C- Enzyme production D- Harboring a small portion of the genetic material
B
Which of the following is a monomer of microfilaments? A- Tubulin B- Actin C- Keratin D- Glucose E- Collagen
B
Which of the following serves as the membrane factory for the cell? A- The nucleus B- Rough ER C- Golgi apparatus D- Chloroplast E- Mitochondria
B
--------consists of a network of membranous tubules and sacs that are studded with ribosomes. A- Golgi apparatus B- Smooth ER C- Rough ER D- Mitochondrion E- The nucleus
C
Alcoholics have particularly large amounts of -------in their liver cells to detoxify alcohol. A- Golgi apparatus B- Lysosomes C- Smooth ER D- Ribosomes E- Vacuoles
C
Energy production is the function of which of the following structures? A- Lysosome B- The central vacuole C- Mitochondria D- Chloroplast E- None of the above
C
Hydrolysis is to lysosome as dehydration synthesis is to......... A- Polypeptides B- Mitochondria C- Ribosome D- Water
C
Muscle cells require high amounts of energy for contraction; therefore they particularly have a lot of: A- Chloroplasts B- Rough ER C- Mitochondria D- Ribosomes E- Lysosomes
C
Muscle contraction is a function of: A- Microtubules B- Intermediate filaments C- Microfilaments D- All of the above
C
The major reservoir of water and inorganic ions in a plant cell is: A- The endoplasmic reticulum B- The nucleus C- The central vacuole D- The Golgi E- The cytosol
C
The selective permeability of the plasma membrane depends on: A- The amphipathic phospholipid bilayer, which serves as a discriminating barrier B- The specific transport proteins built into the membrane C- Both of the above D- None of the above
C
We can think of -------as a warehouse for receiving, modifying, sorting and shipping material in the cell. A- Rough ER B- Smooth ER C- Golgi apparatus D- Lysosomes E- Mitochondria F- Chloroplasts
C
Which of the following best describes the flow of proteins in a secretory pathway through the endomembrane system? A- From nuclear envelope to the rough ER, to the smooth ER, to the Golgi, to the plasma membrane B- From Rough ER to the smooth ER, to the transport vesicles, to the plasma membrane C- From Rough ER, to the transport vesicle, to the Golgi, to the transport vesicle, to the plasma membrane D- From the Golgi, to the transport vesicle, to the rough ER, to the transport vesicle, to the nuclear membrane
C
Which of the following can be found in both animal and plant cells? A- Vacuoles B- Lysosomes C- Mitochondria D- Chloroplasts E- Two of the above
C
Which of the following cannot be found in a plant cell? A- Endomembrane system B- Transport vesicles C- Lysosomes D- Golgi E- Two of the above
C
Which of the following describes the "fluid mosaic model" of the plasma membrane? A- A fluid protein layer between two layers of phospholipids B- A fluid phospholipid bilayer between two layers of proteins C- A fluid structure with various proteins embedded in or attached to a phospholipid bilayer D- A jelly-like carbohydrate structure with a mosaic of various embedded proteins and phospholipids E- None of the above
C
Which of the following is (are) NOT part of the structure of the plasma membrane? A- Proteins B- Lipids C- Nucleic acids D- Carbohydrates
C
Which of the following is not a function of cilia in humans? A- Movement of the macrophages of the blood (white blood cells) B- Increasing the cell surface of the intestinal cells C- Motility of the sperm D- Moving mucus over the lining of trachea E- Moving the egg cell through the oviduct of the uterus
C
Which of the following is not directly involved in the secretory functions of a pancreatic cell? A- ER B- Transport vesicle C- Lysosome D- Golgi E- Plasma membrane F- Ribosome
C
Which of the following serves as the membrane factory of the cell? A- The nucleus B- Golgi C- Rough ER D- Smooth ER E- Ribosomes F- Centrioles
C
Cholesterol of the plasma membrane is thought to serve as a "fluidity buffer" because: A- It absorbs heat and prevents the temperature of the cell to rise B- It solidifies the plasma membrane in higher temperatures C- It makes the plasma membrane more fluid in higher temperatures, and more solid in lower temperatures D- It makes the plasma membrane less fluid in higher temperatures, and less solid in lower temperatures
D
Most of the plasma membrane's functions are due to the presence of --------in its structure. A- Phospholipids B- Carbohydrates C- Cholesterol D- Proteins
D
The transport vesicles that bud off-------------, fuse with the --------face of the Golgi. A- The nuclear envelope....trans B- The cis face of Golgi........trans C- The trans face of Golgi......cis D- The rough ER.......cis E- The smooth ER......trans
D
Which of the following components of the cytoskeleton is a polymer? A- Microtubules B- Intermediate filaments C- Microfilaments D- All of the above
D
Which of the following structures in plant cells is responsible for digestion and recycling of macromolecules? A- Golgi body B- Rough ER C- Lysosome D- A certain type of vacuole E- Transport vesicle
D
Which of the following structures of a prokaryote is not found in mitochondria? A- DNA B- Ribosome C- Cell membrane D- Cell wall
D
Lysosomes are involved in which of the following? A- Autophagy B- Phagocytosis C- Hydrolysis of macromolecules D- Destroying foreign microorganisms E- All of the above F- Only two of the above
E
Membranes of the organisms of extreme cold temperatures: A- Contain more saturated fatty acids B- Are usually solid C- Contain fewer proteins D- Are not different from the membranes of bacteria of hot springs. E- Contain more unsaturated fatty acids
E
The composition of the substance within which of the following structures is the same as that of the cytosol? A- Lysosome B- The central vacuole C- Mitochondria D- Chloroplast E- None of the above
E
Which of the following is (are) not involved in contraction of muscle cells in human? A- Ribosomes B- Smooth ER incorrect C- Microfilaments D- Mitochondria E- Actin-myosin transformations of the cytosol
E
Which of the following is NOT a function of ECM (Extra Cellular Matrix)? A- Mechanical support B- Maintenance of cell's shape C- Interactions of one cell with another D- Interactions between outside and inside of the cell E- Synthesis of the ingredients of the cell wall in plant cells
E
Which of the following is not a function of the endomembrane system? A- Synthesis and transportation of proteins and lipids B- Synthesis of polysaccharides and glycoproteins C- Detoxification of toxins D- Storage of calcium ions E- Synthesis of DNA
E
Which of the following is not part of the endomembrane system? A- Nuclear envelope B- Smooth ER C- Rough ER D- Vesicles E- Mitochondria
E
Which of the following molecules is not found in the plasma membrane? A- Fatty acids B- Cholesterol C- Glycerol D- Protein E- Cellulose
E
The simple diffusion and facilitated diffusion both are called "passive transport" because: A- None of them needs a transport protein B- In both of them the concentration gradient is the driving force C- The cell does not have to expend energy to make them happen D- A and B E- A and C F- B and C
F
Facilitated transport: A- Requires energy B- May occur through a protein channel C- Needs a transport protein D- Occurs against the concentration gradient E- All of the above are true F- Two of the above are true
F (B & C)
Which of the following IS NOT a function of the cytoskeleton? A- Mechanical support B- Muscle contraction C- Organelle movement D- Cell motility E- Anchorage of nucleus and some other organelles F- Changes in cell shape G- Formation of the cell wall
G
Which of the following makes the membranes of a polar bear different from the membranes of fishes that live in the waters of the bay area? A- The types of their integral proteins B- The degree of saturation of their fatty acids C- The number of the cholesterol molecules attached to the membranes of each type D- The presence of triglycerides instead of phospholipids in one of them E- Only A and D F- Only B and C G- A, B and C
G