If two populations are geographically restricted groups of the same species, but display one or more traits that are somewhat different, the two groups are sometimes classified as
A. phenotypes
B. subspecies
C. macrospecies
D. genetic clones
Answer: B
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Rank the elements carbon, sodium, calcium, and iodine in order of decreasing number of electrons
A. CNaCaI B. ICaNaC C. ICCaNa D. CCaNaI
A single oak tree can support hundreds of beetles, caterpillars and other primary consumers. Such a phenomenon is an example of
A. a pyramid of biomass. B. excessive levels of primary production. C. an unusually diverse group of primary consumers. D. primary parasitism. E. an inverted pyramid of numbers.
Which of the following statements about plant macronutrients is/are true? Check all that apply.
_____ They approach or exceed 1% of a healthy plant's dry weight. _____ They reduce the need for CO2 during photosynthesis. _____ A deficiency in any one can have severe effects on a plant's growth. _____ They can have important implications for human nutrition. _____ The ability of the plants to take up minerals is affected by soil pH.
Ribosomal subunits
a. come together in threes to form functional units. b. are composed of mRNA and structural proteins. c. are synthesized in the cytoplasm. d. converge with tRNA when mRNA is to be translated. e. are transcribed from the complementary strand of DNA that is used for tRNA transcription.