Bacteria need iron for growth. However, iron is not found in free form in the blood. So the bacteria may use which of the following mechanism(s) to obtain iron from the host?
A. Secrete enzymes that denature transferrin, a protein that is bound to iron
B. Ingest iron-rich proteins known as ferrosomes
C. Secrete chelating proteins known as siderophores
D. Extract iron from the hosts' own transferrin molecules
E. Both, secrete chelating proteins known as siderophores and extract iron from the hosts' own transferrin molecules
Answer: E. Both, secrete chelating proteins known as siderophores and extract iron from the hosts' own transferrin molecules
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The enzyme responsible for oxidizing pyruvate once it enters the mitochondrial matrix is
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Which of the following best describes the route of water into the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
A population of cells that are genetically identical and may be carrying a desired plasmid is called a(n)
a. genus. b. clone. c. vector. d. exon.
A landslide in the Oregon Cascades causes all the soil in a 30-meter by 300-meter section of a mountain to fall away, taking the trees and their roots and all other vegetation with it. Within three years, however, lichens and some small herbaceous plants
can be seen on the surface of the remaining rock. This is an example of: A) facilitation. B) secondary succession. C) primary succession. D) a climax community.