Which observations illustrate shared ancestry by anatomical comparison studies? Check all that apply.
_____ The same structure has evolved to carry out different functions.
_____ Different structures evolve in similar ways when subjected to the same selective pressures.
_____ A structure becomes vestigial.
_____ Structures are found to be homologous.
__X__ The same structure has evolved to carry out different functions.
_____ Different structures evolve in similar ways when subjected to the same selective pressures.
__X__ A structure becomes vestigial.
__X__ Structures are found to be homologous.
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Phenylacetic acid is added to the penicillin fermentation to allow incorporation of which side chain group?
A. Methyl B. Acetyl C. Benzyl D. Propyl
Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____
a. vessel elements; companion cells b. sieve elements; companion cells c. sieve elements; tracheids d. vessel elements; sieve elements e. vessel elements; tracheids
According to Darwin's theories and observations on "the struggle for existence", organisms better suited to an environment have a greater probability of surviving and will also:
a) lead a long, satisfying life. b) leave more offspring. c) have larger bodies. d) have fewer predators. e) be faster runners.
The following phrases refer to the eukaryotic cell cycle. Select the single BEST choice for each phrase.
A. Last part of interphase in the parent cell B. Period after DNA is duplicated C. Period prior to mitosis D. Nuclear division that maintains the chromosome number E. Period commonly followed by cytokinesis F. Period in which metaphase occurs G. Period when DNA is duplicated H. Period of cell growth before DNA duplication I. Period when interphase begins in a cell J. Event that divides a cytoplasmic mass