Fossils of prokaryotic cells are dated as far back as approximately ________ billion years ago.

A. 2.8
B. 3.8
C. 1.5
D. 4.8


Answer: B

Biology & Microbiology

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The protostomes are divided into two monophyletic groups, the

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Which of the following is not an activated monomer?

A) adenosine triphosphate B) glucose-6-phosphate C) aminoacyl tRNA D) amino acid E) uracil triphosphate

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Understanding why normal cells commit suicide (apoptosis) may be the key to treating some forms of cancer

Indicate whether the statement is true or false

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Which phrase best describes the process of meiosis?

A.) occurs in body cells B.) results in genetically identical cells C.) happens only in haploid cells D.) produces haploid gametes

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