Despite selection against chromosomal variations,
A) related species almost always have the same karyo type.
B) related species almost always have different karyo types.
C) closely related species diverge by many chromosomal rearrangements.
D) distantly related species diverge by only a few chromosomal rearrangements.
B) related species almost always have different karyotypes.
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Plants control the diffusion of water vapor and gases across the epidermis by means of ____
a. xylem b. phloem c. periderm d. companion cells e. stomata
Which of the following occurs during metaphase of mitosis?
a. Centrioles migrate to opposite poles of the cell. b. Chromatin condenses into chromosomes. c. The nuclear envelope disappears. d. Chromosomes decondense into chromatin.
The methods for solving for the intercept and slope of all of the following procedures will yield identical estimates except for which procedure?
A. Solution to 
= 0 and 
= 0
B. Solution to 
= 0 and 
= 0
C. Solving minb,m 
D. Solving minb,m
Which of the following is not a major class of growth factors?
A. Vitamins B. Nucleic acids C. Purines and pyrimidines D. Amino acids