Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.

Fill in the blank(s) with the appropriate word(s).


two, one

Biology & Microbiology

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Illustrate the reaction center of a purple bacterium with the following features highlighted: antenna pigments, the special pair, protein H, protein L, protein M, quinone pool, and ATPase

Also explain the importance of proximity for these components within a reaction center. What will be an ideal response?

Biology & Microbiology

What is the best definition of biotransformation?

A. Production of alcohol from a substrate B. Oxidation of sugar to carbon dioxide C. Use of microorganisms to modify substances not normally used for growth D. Production of a toxin from a nontoxic chemical

Biology & Microbiology

When grouping organisms, which classification is most general for a particular type of organism?

A. Kingdom B. Phylum C. Order D. Family E. Species

Biology & Microbiology

Monocots, but NOT eudicots, have

a. nodes. b. cotyledons. c. coleoptiles. d. hypocotyl hooks. e. flowers.

Biology & Microbiology