There are several species of grain beetles that live on dry meal and do considerable damage to stored grain. In an experiment, a dozen jars of dry meal are set up and fifty individuals of each species, both males and females, are added to each jar. The food supply is not quite sufficient to last for six months and the size of the jar is adequate so that wastes do not become toxic. Most likely, examination of the jars in six months will find
A. the same ratio of beetles as when you started (about half from each species).
B. only one species per jar.
C. only dead beetles in all jars due to intense competition for the niche.
D. a totally random variation in numbers of both beetles.
Answer: B
You might also like to view...
What is the role of Cdks?
a. to add phosphate groups to target proteins b. to check for proper attachment of spindle fibers to chromosomes c. to remove phosphate groups from cyclins d. to arrest the cell cycle e. to allow the cell cycle to work forward or backward
When an electrical impulse traveling along a motor neuron arrives at a neuromuscular junction
A) there is an increase in the secretion of acetylcholine at the neuromuscular junction. B) calcium is transported back to the sarcoplasmic reticulum. C) sliding of actin and myosin filaments is inhibited. D) myosin-actin cross-bridges are destroyed. E) a new electrical impulse is generated that returns the message to the original nerve.
H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together
He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions), and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
Provide a definition of cancer at the genetic level
What will be an ideal response?