Evidence that all living cells have a common origin is provided by:
a. the cell theory, which states that the cell is the basic unit of life.
b. the fact that all new cells come from previously existing cells.
c. the fact that cells are the building blocks of the most complex plants.
d. basic similarities in cell structure and chemistry.
e. the fact that cells are the smallest units that can carry out all life activities.
D
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The research by Natalie De Witt and Michael Sussman showed that proton pump AHA3 is localized in the membrane of companion cells of the source tissue. The function of this pump is to move _____
A) protons from inside of companion cell to outside B) protons from outside of companion cell to inside C) protons inside of companion cell to source cell D) protons and sucrose from inside of companion cell to outside E) protons and sucrose from outside of companion cell to inside
Which of the following does NOT belong with all the others?
a. angiotensins b. ADH c. aldosterone d. renin e. insulin
Figure 25.2
Use the illustration above to answer the questions 4 and 5.
Consider the accompanying figure. Four of the following are true statements about the structure indicated by "D." Which statement is false?
A. It first evolved in arthropods. B. It extends anteriorly into the head region. C. It provides support for muscle contraction. D. It is replaced in most adult vertebrates by the vertebral column. E. It is one of the four exclusive features of chordates.
Humans become infected with Fasciola by
A. ingesting cysts on vegetation. B. consuming cysticerci in contaminated meat. C. ingesting water contaminated with eggs. D. the penetration of cercariae through the skin. E. the bite of infected mosquitoes.