Geosmin, which contributes to the characteristic earthy odor of soils, is produced primarily by the genus ________.
A. Paramecium
B. Armillaria
C. Streptomyces
D. Caenorhabditis
Answer: C
Biology & Microbiology
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A gene mutation
a. is a temporary change in the nucleotide sequence of DNA. b. may be caused by environmental agents. c. always arises spontaneously. d. occurs only in eukaryotes. e. is always damaging to the organism.
Biology & Microbiology
Proteins are made in the ____________________, but are present in all parts of the cell. Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology
A discontinued line in an evolutionary tree indicates
A. extinction. B. gradualism. C. punctuated equilibrium. D. convergent evolution. E. temporal isolation.
Biology & Microbiology
Humans have a maximum of two types of cones
____________________ Indicate whether the statement is true or false.
Biology & Microbiology