The genes on the two chromosomes may have different _____.
Fill in the blank(s) with the appropriate word(s).
alleles
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Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells. B. Radioactive substances have the potential to cause damage to living cells. C. Radioactive substances decay. D. Radioactive substances will perforate plasma membranes.
Hybridization of DNA is _____ and is driven entirely by _____
a. non-spontaneous; ATP b. non-spontaneous; hydrogen bonding c. non-spontaneous; glycolysis d. spontaneous; ATP e. spontaneous; hydrogen bonding
Which of the following causes DNA to wrap tightly
around histones essentially preventing transcription? a. methylation b. acetyl CoA c. nitrogenation d. dehydration e. carbonation
Which phylum of vascular, seed-bearing plants has only about 70 living species in three genera, including Welwitschia and Ephedra?
a. Anthophyta b. Ginkgophyta c. Gnetophyta d. Coniferophyta