Bacillus licheniformis secretes a compound that inhibits the growth of other Gram-positive bacteria. This is an example of a(n)
A. analog.
B. antibiotic.
C. chemotherapeutic.
D. porin.
E. toxin.
Answer: B
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Isotopes of atoms ____
a. have the same number of neutrons but a different number of protons b. behave the same chemically and physically but differ biologically from other isotopes c. are the same physically and biologically but differ from other isotopes chemically d. have the same number of protons but a different number of neutrons e. are produced when atoms lose electrons
In ascomycetes and basidiomycetes, plasmogamy is followed immediately by karyogamy
____________________ Indicate whether the statement is true or false.
In photosynthesis C3, plants differ from C4 plants in
A. the way they capture light. B. the way they capture carbon dioxide. C. the kind of chlorophylls they have. D. None of the choices is correct.
Which of the following is not a category of symbiosis?
A. Parasitism B. Mutualism C. Commensalism D. Communalism