You are performing a Gram stain on gram-negative bacteria and you stop after the decolorizer step. What is the appearance of the bacteria at this point?
A) purple
B) red
C) colorless
D) brown
C
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Some species of insects are able to walk across liquid water because of the:
A. high specific heat of water B. low gravitational effect of their body weight relative to the amount of water C. higher density of liquid water compared to solid water D. capacity of water to function as a solvent E. high surface tension of water due to its cohesion
Fred Griffith's experiment, in which he used two strains of Streptococcus pneumoniae, demonstrated that _____
a. pathogenic bacteria function differently in mice than in other organisms b. harmless bacteria can become transformed into disease-causing bacteria by a bacteria transformation factor c. pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains d. dead cells lose their genetic information e. DNA is a protein rich in nitrogen and phosphorus
Saltatory conduction:a
does not involve voltage-activated potassium ion channels. b. can occur in both myelinated and unmyelinated neurons. c. is slightly slower than continuous conduction. d. is more energy efficient than continuous conduction. e. allows nerve impulses to jump from Schwann cell to Schwann cell
Ecology and environmentalism are the same scientific discipline
Indicate whether the statement is true or false