________ have a dorsal nerve cord
A) Leeches B) Starfishes C) Sharks D) Bugs E) Earthworms
C
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Plant root nodules are
A) formed from gall-rotting bacteria that decompose plant roots. B) harmful to plants, because the bacteria outcompete the plants for nutrients. C) sites where nitrogen fixation occurs. D) structures created by fungi and are found in all agricultural crops.
Which of the following happens during prophase I of meiosis?
A. recombination between non-sister chromatids of homologous chromosomes B. recombination between sister chromatids of homologous chromosomes C. recombination between non-sister chromatids of non-homologous chromosomes D. recombination between sister chromatids of non-homologous chromosomes
In step "b" the original strands have separated because
a. the hydrogen bonds between bases were broken. b. the sugar-phosphate linkages broke. c. the polymerases stopped functioning. d. the bases repelled each other. e. water changed the bases into their subunits.
Explain how the 'greenhouse effect' works (in relation to global warming)
What will be an ideal response?