Lysis of marine algae and cyanobacteria releases the major osmoregulatory solute, dimethylsulfoniopropionate (DMSP), which is degraded into the most abundant organic S compound in nature, ________

A) dimethyl sulfide (CH3-S-CH3)
B) hydrogen sulfide (H2S)
C) gypsum (CaSO4)
D) elemental sulfur (So)


Answer: A

Biology & Microbiology

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Two major environmental extremes of the deep sea are high ________ and low ________

A) pressure / nutrient levels B) nutrient levels / pressure C) temperature / pressure D) oxygen / pressure

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If a normal cell contains 36 chromosomes, how many chromatids are present during alignment? How many strands of DNA? How many genetically unique strands of DNA?

What will be an ideal response?

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For six molecules of carbon dioxide fixed in the light-independent reaction, how many molecules of PGA

are produced?

a. 2 b. 4 c. 6 d. 12 e. 18

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Which of the following is NOT one of the primary purposes of viral cultivation?

A) to isolate and identify viruses in clinical specimens B) to prepare viruses for vaccines C) to do detailed research on viral structure, multiplication cycles, genetics, and effects on host cells D) to classify viruses for taxonomic reasons

Biology & Microbiology