Bacteria that live attached to surfaces are described as ________, whereas bacteria that are free-living, floating with a fluid environment are described as ________.
Fill in the blank(s) with the appropriate word(s).
sessile; planktonic
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Mangrove plants live in areas regularly flooded with salt water. Which of these is not a possible mechanism for controlling their salt balance?
A. The roots block salt uptake. B. The succulent leaves contain large quantities of water that dilute salt that is absorbed. C. Absorbed salt is secreted from special salt glands. D. Modified roots emerge above the water level and help oxygen diffuse into the roots. E. Excess salt is stored in special tissues.
An electrically charged molecule or atom is a(n) ________
Fill in the blank(s) with correct word
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.
The monomer of a nucleic acid is called a (nucleoside/nucleotide/base)
What will be an ideal response?