An axenic environment is one
A) in which microorganisms remain with the person throughout life.
B) that is free of microbes.
C) that is a source of contamination.
D) in which microorganisms remain present only for a short time.
E) contaminated by microbial toxins.
B
Bloom's Taxonomy: Knowledge
Section: Symbiotic Relationships Between Microbes and Their Hosts
Learning Outcome: 14.3
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Gap genes, segment-polarity genes, and homeotic genes all _____
A) act independently of one another B) code for transcription regulatory factors C) can be activated at any time during development D) are unique to Drosophila embryos
Which of the following are produced by roots in order to increase surface area, allowing for greater access to nutrients in the soil?
A. root hairs B. root nodules C. root parenchyma D. root Casparian strips
Nucleotides are to nucleic acids as amino acids are to ________.
Fill in the blank(s) with the appropriate word(s).
Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?
A) the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts B) the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts C) the size disparity between most prokaryotic cells and most eukaryotic cells D) the observation that some eukaryotic cells lack mitochondria