What is the function of gap junctions?
a. to allow plant cells to communicate with each other
b. to allow ions and small molecules to pass between cells
c. to give the cell its shape
d. to seal the spaces between cells
Ans: b. to allow ions and small molecules to pass between cells
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Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister, and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The cowpox virus prevented the small pox virus from entering the child's immune system. B. the smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus C. The cowpox infection will prevent the child from being infected by the small pox virus. D. The cowpox infection will have no effect on the child's immunity to the small pox virus.
The type of fruit that is derived from one flower with many separate carpels is a(n) fruit.
A. axillary B. aggregate C. simple D. double E. multiple
What is the most recent common ancestor of fungi and animals?
A) A protist B) Moss C) A bryophyte D) Algae
One way to detect the growth of a virus in culture is to observe the degeneration and lysis of infected cells in the monolayer of cells. These areas show up as clear, well-defined patches in the cell sheet called
A) colonies. B) plaques. C) turbidity. D) cottony patches.