During the Gram stain procedure, a Gram _________ cell will be purple after the addition of Crystal Violet, and clear after the decolorization step.
A) Negative
B) Positive
A) Negative
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Which animal(s) can get needed oxygen by diffusion of the gas across a body surface and can distribute oxygen without the need of a specialized circulatory system?
A. fish B. flatworms C. fish and flatworms D. sea anemones E. sea anemones and flatworms
Keystone species:a
are always symbionts. b. are typically not the most abundant species in the community. c. illustrate secondary succession. d. always form the base of a food chain. e. are only found in tropical communities
A location in a plant where sugar is being received for storage or consumption is ________
A) a sugar sink B) a sugar source C) phloem sap D) phloem tube
A point mutation that creates a premature stop codon is called a _____
A. synonymous (silent) mutation B. nonsynonymous (missense) mutation C. nonsense mutation D. translation mutation E. transition mutation