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
Answer: D
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Oxygenic photosynthesis made possible the accumulation of oxygen in Earth's atmosphere and oceans. The primary producers of oxygen as of 800 million years ago that power the modern carbon cycle are:
A. cyanobacteria. B. anoxygenic phototrophs. C. algae and plants. D. purple bacteria.
The synthesis of glucose requires electrons; in photosynthesis, electrons are obtained from ________
a. water b. organic matter in soil c. oxygen d. carbon dioxide
The risk of cancer can be reduced by ________
A) decreasing fruit intake because fruits can be carcinogenic B) smoking more because nicotine can kill cancerous cells C) avoiding unnecessary medical x-rays D) increasing saturated fats in the diet
According to the Ohio Department of Natural Resources, which nocturnal species of squirrel is most common but rarely seen?
A. Southern Flying Squirrel B. Red Squirrel C. Eastern Grey Squirrel D. Eastern Fox Squirrel