Which of the following organisms causes "red tides" and extensive fish kills?
a) amoeba
b) ulva
c) diatoms
d) plasmodium
e) dinoflagellates
Answer: e) dinoflagellates
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Meiosis results in a reassortment of maternal chromosomes (inherited from the mother) and paternal chromosomes (inherited from the father). If n=4 for a given species, and ignoring the effects of crossing over, what is the probability that a gamete will receive only paternal chromosomes?
A. 1/2 B. 1/4 C. 1/8 D. 1/16 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 know about independent assortment? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
The actinoplanetes can be found in ________ habitats.
A. freshwater B. marine C. soil D. All of the choices are correct.
What is the main difference between mismatch repair (MMR) in eukaryotes and prokaryotes?
A. Eukaryotes lack a functional Mut H and Dam methylase. B. Eukaryotes have proteins homologous to MutS and MutH but not MutL. C. Eukaryotes only repair the lagging strand. D. Prokaryotic MMR can repair small loops of unpaired nucleotides, whereas eukaryotes cannot. E. Both use exonucleases to eliminate the mismatched strand but eukaryotes only require 3'-5' exonucleases.
Which structure is derived from an ancestral air-breathing lung in ray-finned fishes and is used to increase buoyancy?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system