One hallmark of speciation is ____
a. lack of change in reproductive behaviors
b. a decrease in balanced polymorphisms
c. an increase in fixed alleles
d. decreased genetic diversity of populations
e. end of gene flow between populations
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Eukaryotic cells regulate the expression of multiple genes by having ____
a. individual activators for individual genes b. a few activators that can interact with small subsets of genes c. activators that serve as catalysts for further activator protein synthesis d. a few activators that work in different combinations to activate different genes
e. a single activator that undergoes modifications to enable interaction with different promotersWhy are conifers and cycads considered gymnosperms?
A. The pollen is wind-dispersed. B. The fruit is not fleshy. C. Pollination and fertilization occur at different times. D. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination. E. They have true vascular tissue but do not form seeds.
A stem that cannot increase in diameter is lacking what type of tissue?
A. xylem B. procambium C. vascular cambium D. ground meristem E. protoderm
The DNA molecule is replicated _____.
A) to produce an identical molecule B) before a cell divides C) during interphase D) all of the choices