The signal for aggregation and communal activity

by cellular slime molds is
a. auxin.
b. cyclic-AMP.
c. glycoprotein slime.
d. RNA.
e. unidentified as yet.


Answer: b

Biology & Microbiology

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An electron microscope must use electromagnet "lenses" shaped like donuts to direct the electrons onto the specimen. Why?

A. Electrons are particles-there are also particles in air. Without a vacuum, the electrons would strike and be scattered by the atoms/particles within the air. B. Because electrons are highly radioactive, and the chamber must be completely sealed to prevent them from escaping and contaminating the lab area. C. This is the method for fixing the specimen to the slide grid for an electron microscope. Without fixing the specimen by vacuum, it would slide off and we wouldn't be able to visualize it. D. All of the above are true.

Biology & Microbiology

The forces of the mantle acting on the crust give way to:

a. ocean basins. b. continental drift. c. magma. d. continental rise.

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In capillary exchange, where does osmosis take

place?

a. at the arterial end b. along the entire length of the capillary c. at the venous end d. in the middle part of the capillary e. osmosis does not take place in capillary exchange

Biology & Microbiology

When viewing a cell culture under a microscope, most cells would be in which phase of cell cycle?

a. telophase b. interphase c. metaphase d. cytokinesis e. prophase

Biology & Microbiology