Which of the following describes the pine life cycle?
a. Gametophytes are free living and photosynthetic, but are replaced by a dominant sporophyte generation.
b. Sporophytes originate within and are dependent upon gametophytes.
c. Gametophytes originate within and are dependent upon sporophytes.
d. Both gametophytes and sporophytes are totally independent from each other and are equally dominant.
Ans: c. Gametophytes originate within and are dependent upon sporophytes.
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a. animals. b. fungi. c. plants. d. protists.
The negative logarithm of the hydrogen ion concentration in the solution is referred to as:
A. -OH concentration B. atomic mass C. electronegativity D. specific heat E. pH
Leu" refers to a gene that governs a cell's ability to synthesize leucine from inorganic precursors. What does the designation "leu-" indicate?
a. that the bacterium is biologically inactive b. that the allele is the mutant allele c. that the bacterium is biologically active d. that the allele is normal (i.e., wild type)