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40 Cards in this Set

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  • Back
What is not a distinguishing characteristic of prokaryotic cells?
they lack a plasma membrane
Which statement best describes what happens when a gram-positive bacterium is places in distilled water and penicillin?
The cell will undergo osmotic lysis.
Which statement best describes what happens when a gram-negative bacterium is placed in distilled water and penicillin?
Water will move into the cell.
Which statement best describes what happens when a gram-positive bacterium is placed in an aqueous solution of lysozyme and 10% sucrose?
No change will result; the solution is isotonic.
Which of the following statements best describes what happens to a cell exposed to polymyxins that destroy phospholipids?
Intracellular contents will leak from the cell
Which of the following is not true about fimbriae?
They may be used for motility.
You have isolated a motile, gram-positive cell with no visible nucleus. You can assume this cell has
Ribosomes
The antibiotic amphothericin B disrupts plasma membranes by combining with sterols; it will affect of the following cells except
Bacterial cells
Which of the following is not alive, but requires life to be able to reproduce?
viruses
Which statement best describes the function of the rough endoplasmic reticulum?
Synthesis and assembly of membrane and secreted proteins
Which statement best describes the function of the Golgi apparatus?
Processing of membrane and secreted proteins, including glycosylation
In some diseases like cystic fibrosis, a cell membrane receptor fails to function. In the majority of cases, the problem comes from a change in the receptor so that it cannot reach the cell surface. The site in the cell where membrane proteins are synthesized and assembled builds up with the abnormal protein. This site would likely be the:
endoplasmic reticulum
The following organelle is found in prokaryotic cells but not eukaryotic cells of animal origin.
cell wall
Mitochondria and chloroplasts both:
function to provide the cell a source of energy
are present in plants
contain DNA
You are trying to identify an unknown gram-negative bacterium. Which of the following stains is not necessary?
Acid-fast stain, Endospore stain
Assume you stain Bacillus by applying malachite green with heat and then counterstain with safranin. Through the microscope, the green structures are
Endospores
Carbolfuchsin can be used as a simple stain and a negative stain. As a simple stain, the pH is_______________.
higher than the negative stain
Looking at the cell of a photosynthetic microorganism, you observe that the chloroplasts are green in brightfield microscopy and red in fluorescence microscopy. You conclude that_________________.
Chlorophyll is fluorescent
Which of the following is not a functionally analogous pair of stains?
Nigrosin and malachite green
Assume you stain Clostridium by applying a basic stain, carbolfuchsin, with heat, decolorizing with acid-alcohol, and counterstaining with acidic stain, nigrosin. Through the microscope, the endospores are ___________ and the cells are stained ___________.
red; colorless
Assume that you are viewing a Gram-stained field of red cocci and blue bacilli through the microscope. You can safely conclude that you have___________.
Two different species
In 1996, scientists described anew tapeworm parasite that had killed at least one person. The initial examination of the patient's abdominal mass was most likely using _____________.
Brightfield microscopy
Which of the following is not a modification of a compound light microscope?
Electron microscopy
Which of the following organelles most closely resembles a prokaryotic cell?
Mitochondrion
Which of the following is not a chemical component of a bacterial cell wall?
Cellulose
Which of the following is not part of the active transport process?
cell wall
In bacteria, photosynthetic pigments are found in ____________.
Chromatophores.
The difference between simple diffusion and facilitated diffusion is that facilitated diffusion ____________.
Requires transporter proteins
Fimbriae and pili differ in that pili ____________.
Are used to transfer DNA.
Where are phospholipids most likely found in a prokaryotic cell?
plasma membrane
You have isolated a motile, gram-positive cell with no visible nucleus. You can safely assume that the cell ____________.
has a cell wall
Which substance in the following reaction is being reduced?

HCCH3O + NADH +H+ (Acetaldehyde) -> H2CCH3OH + NAD+ (Ethanol)
Acetaldehyde
Which of the following reactions produces the most molecules of ATP during aerobic metabolism?
Acetyl CoA -> CO2 + H2O
Which of the following processes does not generate ATP?
The Calvin-Benson cycle
Which of the following compounds has the greatest amount of energy for a cell?
Glucose
Which of the following is the best definition of the Krebs cycle?
A series of chemical reactions in which NADH is produced from the oxidation of pyruvic acid
Which of the following is the best definition of respiration?
A sequence of carrier molecules with an inorganic molecule as the final electron acceptor
Which culture produces the most lactic acid?
E. coli growing in glucose broth at 35°C without O2 for 5 days
Which culture produces the most ATP?
E. coli growing in glucose broth at 35°C with O2 for 5 days
Which culture uses NAD+?
E. coli growing in glucose broth at 35°C with O2 for 5 days
E. coli growing in glucose broth at 35°C without O2 for 5 days