Figure 10.1 represents a Petri plate. The gray area is where bacteria A is growing, the black area is where bacteria B is growing. The white area is a zone where neither organism is growing. What is the best interpretation of what is observed on the plate?
A. Bacteria B is producing an antibiotic that inhibits the growth of bacteria A.
B. Bacteria A produces a compound that inhibits the growth of bacteria B.
C. Bacteria A grows faster than bacteria B.
D. Bacterial colony B has depleted the nutrients in the area around the colony.
E. No conclusion can be made from this information.
Answer: A
You might also like to view...
In prokaryotes, repressor proteins: (Select all correct choices)
A. bind with DNA and prevent transcription. B. bind with activators and prevent transcription. C. are part of the mechanism of positive regulation. D. are part of the mechanism of negative regulation.
A bacterial cell that is bio- met- leu+ thr- thi+ is infected by a virus carrying bacterial DNA containing bio+ met+
leu- thr- thi+. If all five genes from the virally transduced DNA are recombined into the recipient cell, what kinds of nutrients will the resulting cell still require from the medium in order to grow? Explain your answer.
What will be an ideal response?How do archaeal and eukaryotic cell membranes differ?
a. Archaeal membrane phospholipids form covalent bonds with one another, but eukaryotic membrane phospholipids do not. b. Eukaryotic membrane phospholipids are not composed of fatty acids, but archaeal membrane phospholipids are. c. Archaeal phospholipids move freely throughout the bilayer, but eukaryotic membrane phospholipids are stationary. d. Archaeal, but not eukaryotic, membranes are described by the fluid mosaic model. e. Eukaryotic membranes are less fluid than archaeal membranes.
A patient arrives at a hospital suffering from serious difficulty breathing and shortness of breath. Initial tests indicate none of the standard respiratory infectious agents are present. The physician suspects an immune disorder. What clinical
indicators would distinguish between asthma, pneumonitis and Pneumocystic pneumonia? What will be an ideal response?