How do Hawaiian bobtail squids prevent all bacteria except Allivibrio fischeri from colonizing their light organ?
What will be an ideal response?
Answer: Firstly, the mucus produced in the light organ specifically aggregates gram-negative bacteria (Allivibrio fischeri is gram-negative). In addition, the squid excrete toxic levels of nitric oxide (NO) around the organ. A. fischeri contains NO-inactivating enzymes that allow it to tolerate NO exposure and colonize the organ. NO is continually produced in the light organ, thus preventing other bacterial species from colonizing the tissue.
You might also like to view...
The posterior pituitary secretions produce their effects
a. on the gonads. b. in the thyroid glands. c. on adrenal glands. d. on mammary glands. e. on thirst mechanism.
The biological species concept:
A. states that any organisms that are biologically similar constitute a species. B. states that a species is any group that shares similar DNA. C. is the best and most accurate species concept. D. defines a species as any group of actually or potentially interbreeding species that produce viable offspring.
Independent assortment refers to the fact that
A. a cell will divide and produce various offspring regardless of whether any other cell is dividing. B. mitosis normally produces cells that are like each other and like the parent cell. C. the daughter cell that receives the maternal #1 chromosome will not necessarily receive the maternal #2. D. a crossover between two chromosomes will produce offspring unlike either parent.
Only primates play
Indicate whether the statement is true or false