Adult zebra mussels are __________, and they are __________ when in the early stages
a. invisible; invisible
b. invisible; visible
c. visible; invisible
d. visible; visible
C
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Plant species regularly hybridize in nature, but only some crosses result in new polyploid species. Of the crosses below, if each one occurred, which would be most likely to result in a new stable polyploid species?
A. A cross between a 2n gamete and a 1n gamete, forming a 3n hybrid. B. A cross between a 4n gamete and a 1n gamete, forming a 5n hybrid. C. A cross between a species with a CC genome and a species with a DD genome, forming a hybrid with a CD genome. D. A cross between a species with a BB genome and a species with a DD genome, followed by a doubling of chromosomes, forming a hybrid with a BBDD genome. 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 polyploidy? 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?
Each of the following small molecules easily diffuses through the cell membrane EXCEPT ____
a. steroid hormones b. O2 c. H2O d. glucose e. CO2
In bacterial cells, the tryptophan operon encodes the genes needed to synthesize tryptophan. What happens when the concentration of tryptophan inside a cell is high?
a. It activates the tryptophan repressor, allowing transcription of the tryptophan operon. b. It inactivates the tryptophan repressor, allowing transcription of the tryptophan operon. c. It activates the tryptophan repressor, which shuts down expression of the tryptophan operon. d. It inactivates the tryptophan repressor, which shuts down the tryptophan operon. e. It activates the tryptophan repressor, which breaks down excess tryptophan.
A deficiency in thyroxine can result in
A. weight loss. B. a reduced thyroid. C. stunted growth in children (cretinism). D. a rapid metabolic rate.