The finding that virtually all organisms use the same genetic code provides the basis for declaring that the code is universal. Name at least two exceptions to such universality
What will be an ideal response?
mitochondrial DNA, Mycoplasma capricolum, some protozoans
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Mycobacterium and Nocardia are different from most gram-positive bacteria in that their cell walls
A. contain unique, waxy lipids. B. contain more peptidoglycan. C. are easily decolorized during staining. D. contain a layer of lipopolysaccharide.
The poison, warfarin, causes internal
a. neurological malfunctioning. b. bleeding. c. seepage of acid from the stomach. d. muscle degeneration. e. epithelial destruction
Which statement about plasma membranes is false?
a. Plasma membranes regulate the passage of materials. b. Plasma membranes divide the cell into compartments. c. Plasma membranes serve as surfaces for chemical reactions. d. Plasma membranes prevent communication with other cells. e. Plasma membranes transmit signals between the environment and the interior of the cell.
What would happen to the helix-3 interaction with DNA if a mutation occurred that altered this adenine (as shown) to guanine?
A. The integrity of the interaction would increase because the hydrogen bonds would still be able to form and would be stronger. B. The integrity of the interaction would remain the same because the same two hydrogen bonds would still be able to form. C. The integrity of the interaction would decrease because one of the two hydrogen bonds would not be able to form.