Which of the following junctions permits ions and small molecules to pass from the cytoplasm of one cell to another?
a. gap
b. tight
c. cell
d. adhering
a
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Which of the following is responsible for the impermeability of the epithelium lining the bladder and ducts connecting the pancreas to the digestive tract?
A) adherens junctions B) gap junctions C) desmosomes D) tight junctions E) hemidesmosomes
Cargo ships that entered the Great Lakes through canals in the St. Lawrence River inadvertently introduced zebra mussels. This species is not native to the Great Lakes and reproduces at a very high rate. Zebra mussels are filter feeders and are very efficient at filtering out phytoplankton and zooplankton. How would their introduction impact the organisms on the Great Lakes?
A) Biodiversity would increase because of the introduction of another species to the ecosystem. B) The native organisms would not be impacted at all. C) Their impact would be negligent because the lakes are so big and do not have other organisms that feed on the plankton. D) The native organisms that depended on the same food source would decrease in population, affecting the rest of the organisms in the food web.
The diploid number of chromosomes on a human skin cell is 46. What is the number of chromosomes found in a human egg cell?
A) 92 B) 12.5 C) 23 D) 46 E) 184
Proximate Hypothesis/cause
What will be an ideal response?