Why is cyanide harmless to some bacteria?
A. They break down the cyanide before it enters the electron transport chain.
B. They shut off the TCA cycle until the cyanide is diluted out of the cell.
C. They lack cytochrome c oxidase.
D. They don't allow cyanide to cross their cell wall.
E. Cyanide is deadly for all bacteria.
Answer: C. They lack cytochrome c oxidase.
You might also like to view...
In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only redeyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were
a. Xw+Xw+; XwY. b. Xw+Xw; XwY. c. XwXw; Xw+Y. d. Xw+Xw; Xw+Y. e. XwXw; XwY.
Among air breathing animals, birds have the most effective mechanism of extracting oxygen from air
because
a. birds utilize countercurrent exchange. b. bird lungs have more surface area. c. bird lungs are the largest among vertebrates. d. the air sacs provide additional respiratory surfaces. e. birds utilize positive force exchange.
Cardiac muscle tissue is involuntary and the cells are tapered at both ends.
a. true b. false
Diffusion of materials from outside to the middle of a cell depends upon
A. the thickness of the cell membrane. B. the distance from the surface to the middle of the cell. C. the age of the cell. D. osmosis.