What might be a major disadvantage of having a ball-and-socket joint, rather than a hinge joint, in the human knee?
A) Reduced ability to move the lower leg B) Decreased joint flexibility
C) Decreased muscle strength D) Decreased joint stability
D
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Species of the genus Hyphomicrobium are budding bacteria that attach to solid objects and are ________.
A. able to reproduce by budding B. found in marine and freshwater environments C. aerobic chemoheterotrophs D. All of the choices are correct.
In a bacterial cell, the three genes of the lactose operon are
A) expressed continuously. B) expressed when lactose synthesis is required. C) expressed only in the presence of lactose. D) never expressed, because they are pseudogenes.
Some plants have cultivated a symbiotic relationship with soil bacteria capable of fixing atmospheric nitrogen. Why do plants need nitrogen?
a. to build lipids important in membranes and energy storage b. to make the saccharides used to build their cellulose cell walls c. to synthesize amino acids that are used to form proteins d. nitrogen is an important energy source to plants that cannot harvest sunlight
Genes for the resistance to antibiotics are usually located _____.
A.) on plasmids B.) on the main chromosome C.) in mitochondria D.) in eukaryotic cells E.) on the outside of the cell wall