The counterstain in the Gram stain is
a. A negative stain.
b. A mordant.
c. An acid dye.
d. A basic dye.
e. Necessary to determine the Gram reaction.
Answer: d. A basic dye.
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Hox genes are a family of transcription factors that regulate development throughout the animal kingdom. Studies of Hox genes in mice and Drosophila showed that many Hox genes are conserved between both species, and several Hox genes duplicated into new genes with novel functions within mice. Some Hox genes have even lost all function. Hox genes provide an example of which of the following? Check all that apply.
_____ orthologs _____ paralogs _____ heterologues _____ pseudogenes Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about homology? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Animal cells divide by
a. budding. b. contracting. c. pinching. d. cell plate formation. e. more than one of these
Types of Symbiosis
What will be an ideal response?
Increased atmospheric CO2 is ________ the oceans, and it is expected to be detrimental to marine ________ such as corals, foraminifera, and coccolithophores
a. acidifying / calcifers b. neutralizing / silicates c. alkalizing / protists d. warming / algae