What would you anticipate seeing if you accidentally switched crystal violet and safranin while performing a Gram stain?
a. All bacteria would appear purple.
b. Gram-positive bacteria would appear pink and Gram-negative bacteria would appear purple.
c. Gram-positive bacteria would appear purple and Gram-negative bacteria would appear pink.
d. All bacteria would appear pink.
Answer: a. All bacteria would appear purple.
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Immigration and __________ permanently affect population size, but __________ does not. Fill in the blank(s) with the appropriate word(s)
Headwater streams depend primarily on ____ as an energy input
a. photosynthesis b. detritus c. phytoplankton d. zooplankton e. nekton
_____ are toxic proteins secreted by pathogenic bacteria, whereas _____ are components of the outer membrane of gram-negative pathogens
a. endotoxins...phosphotoxins b. endotoxins...botulinum toxins c. toxozymes...endotoxins d. exotoxins...enterotoxins e. exotoxins...endotoxins
Analysis of a bacterial gene indicates that 24% of the nucleotides in the coding strand contain the base A, 18% contain the base T, 26% contain the base G, and 32% contain the base C. What percent of the nucleotides in the mRNA transcribed from this gene will contain the base U? (Enter your answer as a number only, without the percent sign; e.g., enter 5, not 5%.)
Fill in the blank(s) with the appropriate word(s).