Quorum sensing
A. depends on the sensing of signal protein molecules.
B. is a phenomenon in which bacteria monitor their own population density.
C. plays an important role in formation of biofilms by Pseudomonas aeruginosa.
D. All of the choices are correct.
Answer: D
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Macroplankton are organisms visible to the naked eye and generally exceed ____ in size
a. 5 mm b. 1 mm c. 5 mm d. 10 mm e. 10 cm.
At what point during development does the embryo form three germ layers?
A. when the nervous system develops B. when it forms the inner cell mass C. when it becomes recognizable as human D. when it begins cleavage E. when it forms the gastrula
The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is a characteristic common to all of these extracellular structures?
A) They must block water and small molecules to regulate the exchange of matter and energy with their environment. B) They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume. C) They are constructed of polymers that are synthesized in the cytoplasm and then transported out of the cell. D) They are composed of a mixture of lipids and nucleotides.
Plasma membranes are selectively permeable. This means that
A) anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. B) the plasma membrane allows some substances to enter or leave a cell more easily than others. C) glucose cannot enter the cell. D) plasma membranes must be very thick.