How do cyanide and carbon monoxide affect cellular respiration?
What will be an ideal response?
Cyanide blocks the transfer of electrons from complex IV to oxygen. Carbon monoxide leads to
abnormalities in mitochondrial function that inhibit complex IV activity.
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The internal urethral sphincter is composed of smooth muscle, and the external urethral sphincter is composed of skeletal muscle; together, they control the process of urination
Indicate whether the statement is true or false
Which of the following terms refers to a bacterium moving towards a light source?
a. Negative phototaxis b. Negative chemotaxis c. Positive chemotaxis d. Positive phototaxis
Which of the following is not found in the cytoskeleton?
A. intermediate filaments B. spindle fibers C. actin filaments D. microfilaments E. none of the above
Some flowers have distinctive patterns that only reflect ultraviolet light and therefore are invisible to humans. Which statement about such markings is not correct?
A. The ultraviolet patterns repel birds and bats from the flowers. B. Carotenoid pigments are responsible for the ultraviolet patterns. C. Flowers with ultraviolet patterns usually appear yellow or orange to humans. D. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites. E. The ultraviolet patterns are highly visible and attractive to bees.