The secondary structure of a protein forms ____

a. pleated sheets or coils
b. when pleated sheet regions fold back on themselves
c. from interactions between polypeptide chains
d. from covalent bonding between amino acids

e. a functional chromatin unit


a

Biology & Microbiology

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Most chemolithotrophs have electron transport chains that terminate with O2 as the final electron acceptor.

Answer the following statement true (T) or false (F)

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Meiosis typically results in the production of

a. two diploid cells. b. four diploid cells. c. four haploid cells. d. two haploid cells. e. one triploid cell.

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Calcification results in the buildup of dissolved alkaline salts in the B horizon of soils

Indicate whether the statement is true or false

Biology & Microbiology

The oldest fossils ____.

A. demonstrate the widest distribution B. represent the most highly evolved organisms C. are buried deeper in the ground than newer forms D. are found in Africa E. are primitive marine vertebrates

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