In a series of cotransformation experiments, DNA fragments from x+y+z+ donor bacteria were used to transform xyz recipient bacteria
The following transformation phenotypes were observed in the recipient cells: xy+z xyz+ x+y+z x+yz+ What does this imply about the gene order of x, y, and z?
The gene order must be y-x-z. Since the genes y and z are never cotransformed, they must be far apart on the DNA. However, x and y are sometimes cotransformed, and y and z are sometimes cotransformed, so each of these genes must be more closely linked to one another.
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mtDNA contains all of the genes necessary for the complete function of mitochondrial metabolism
Indicate whether the statement is true or false
All of the following are true of acute necrotizing ulcerative gingivitis (ANUG) except that it
A. is associated with severe pain, bleeding, pseudomembranes, and necrosis. B. is highly contagious. C. is common in AIDS patients. D. involves Treponema vincentii, Prevotella intermedia, and Fusobacterium. E. is due to poor oral hygiene, altered host defenses, or prior gum disease.
A layer of membrane outside the protein coat of some viruses is called a(n)
A. capsomere. B. capsid. C. protein coat. D. envelope. E. plasmid.
According to the ________ principle, a muscle cell contracts completely when adequately stimulated by a motor neuron
Fill in the blank(s) with correct word