Which of the following structures allow bacteria to transfer genetic information through conjugation?
A) slime layer B) pili C) capsule D) fimbriae E) glycocalyx
Answer: B
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The main steps of the nitrogen cycle are:a
nitrogen fixation, nitrification, assimilation, digestion, and denitrification. b. nitrigenation, nitrification, assimilation, ammonification, and denitrification.
c. nitrogen fixation, nitrification, assimilation, ammonification, and dinitrification. d. nitrogen fixation, nitrification, assimilation, carbonation, and denitrification. e. nitrogen fixation, oxidation, assimilation, ammonification, and denitrification.
The scenario of prebiotic evolution leading to the origin of life on Earth is plausible because
A) it has been observed under laboratory conditions. B) there was a vast period of time for simple chemicals to evolve into complex molecules found in cells that exist today. C) experiments suggest that all of the chemical components of living cells can be formed quickly from inorganic precursors. D) it has been observed to occur on other planets. E) it has been observed to occur near thermal vents at the bottom of the ocean.
A(n) ____________________ cannot be verified because it involves subjective judgment. Fill in the blank(s) with the appropriate word(s)
The KN-1 gene in maize is normally expressed in ____
a. in primary meristems, where it initiates the process of differentiation b. in apical meristems, where it maintains the undifferentiated state c. in apical meristems, where it initiates the process of differentiation d. in primary meristems, where it maintains the undifferentiated state e. in lateral meristems, where it initiates the process of secondary growth