At the most fundamental of levels, differences in life histories (that is, reproductive strategies) are trade-offs that are based on differences in the ________
A) onset of reproductive maturity
B) reproductive sizes of the individuals
C) allocation of energy between individuals
D) average number of offspring produced over the life span of individuals
C
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Groups of three consecutive bases along the DNA of a gene have the code for one ________.
A. amino acid B. nucleotide C. purine D. protein
Structural features that spatially organize the interior of the cell are
a. plastids. b. vacuoles. c. microvilli. d. nucleoli. e. microtubules
Which term describes the directed growth of plants in response to light?
a) Photosynthesis b) Active transport c) Transpiration d) Phototropism
In which of the following will isotopes of an element always differ?
a. number of protons b. number of electrons c. atomic mass d. atomic number e. None of the listed responses is correct.