The duration of an action potential is approximately five ____
a. microseconds
b. milliseconds
c. centiseconds
d. seconds
e. nanoseconds
ANSWER: b
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Which group of bacteria is described as catalase positive and is gram-positive cocci that grow facultatively anaerobic and form grapelike clusters?
a. Neisseria b. Rothia (stomatococci) c. Staphylococcus d. Micrococcus
Which of the following processes do not require plants to spend energy? Choose all that
A. water transport through xylem B. carbohydrate transport through phloem C. C3 photosynthesis D. C4 photosynthesis E. nutrient transport across endoderm cells
How do axial filaments differ from regular bacterial flagella?
a. They do not rotate. b. The axial filament is located between the cell membrane and the outer membrane. c. They do not function in cell movement.
Match the scientist(s) with the statement on the right.
A) was able to solubilize and create lipid bilayers B) demonstrated transmembrane proteins C) was able to solubilize and create lipid monolayers D) described the chemical nature of the cell membrane E) demonstrated that membranes were a bilayer F) proposed the "lipid protein sandwich" model of the cell membrane G) proposed the fluid mosaic model of the cell membrane H) used electron microscopy for the basis of the proposed "unit membrane" model 1) Davson and Danielli 2) Gorter and Grendel 3) J. David Robertson 4) Irving Langmuir 5) Unwin and Henderson 6) Charles Overton 7) Singer and Nicolson