When direct examination of virioplankton is carried out by transmission electron microscopy, the numbers obtained are reported as ________.
A. particulate organic matter
B. viral potential
C. plaque-forming units
D. virus-like particles
Answer: D
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In life cycles that alternate between haploid and diploid stages, fertilization doubles the number of chromosomes per cell while ______ reduces it in half.
A. mitosis B. meiosis C. binary fission D. syngamy
Allof the following evidence supports the RNA world hypothesisexcept:
A. RNA can function as a genome. B. An RNA component of ribosomes catalyzes the synthesis of proteins. C. RNA can serve a structural role. D. RNA stabilizes membranes. E. RNA regulates gene expression.
The difference between people who handle stress
well and those who become deeply depressed is based on all BUT a. polygenic inheritance. b. genes and the environment. c. a transporter protein that moves serotonin into brain cells. d. a gene product that counters anxiety. e. a gene mutation.
A lichen results from the mutualistic relationship between fungi and which of the following?
A) cyanobacteria or algae B) green plants C) heterotrophic bacteria D) protozoans