Water is an example of a(n)
a. atom.
b. ion.
c. compound.
d. mixture.
e. element.
C
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Consider the following experiment. First, large populations of two mutant strains of Escherichia coli are mixed, each requiring a different, single amino acid. After plating them onto a minimal medium, 45 colonies grew
Which of the following may explain this result? A) The colonies may be due to back mutation (reversion). B) The colonies may be due to recombination. C) Either A or B is possible. D) Neither A nor B is possible.
Gymnosperm phyla include
_____ Cycadophyta. _____ Ginkgophyta. _____ Coniferophyta. _____ Lycophyta. _____ Angiospermae.
A diploid cell has 44 chromosomes. After meiosis I, how many chromosomes does it have? How many chromatids?
A) 22; 22 B) 22; 44 C) 44; 22 D) 44; 44
A solution with a pH of 9 has ____ times fewer hydrogen ions than a solution with a pH of 6
a. two b. four c. 10 d. 100 e. 1,000