Which of the following is an example of a bacterial cell utilizing a siderophore to collect iron?
A) Hemolytic bacteria collect hemoglobin from host red blood cells and breaks them down to extract iron.
B) Bacteria use manganese instead of iron.
C) Bacteria collect host iron-binding proteins and breaks them down to extract iron.
D) Bacteria produce proteins that degrade host cells and cause the release of iron.
E) Bacteria produce proteins that steal iron from host iron-binding proteins.
Answer: E
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A central vacuole
(a) is found only in plant cells. (b) may take up between 50% and 90% of the cell’s interior. (c) regulates water balance. (d) is all of the above.
In the formation of acetyl coenzyme A in aerobic respiration, NAD is __________ to NADH.
Fill in the blank(s) with the appropriate word(s).
Although children believe that "holding my breath until I die" is possible, why should parents not be concerned by this threat?
A) As a child holds his or her breath, oxygen levels build, stimulating breathing by the brain stem. B) As a child holds his or her breath, oxygen levels decrease, stimulating breathing by the brain stem. C) As a child holds his or her breath, carbon dioxide levels decrease, stimulating breathing by the brain stem. D) As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem.
A Petri dish containing isolated colonies of Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa would be described as being
A) A mixed culture B) An axenic culture C) A pure culture D) A contaminated culture