The principal driving force for guttation is ____
a. passive transport
b. sunlight
c. root pressure
d. upward pressure as sugar is forced into the roots
e. pumping by the xylem cells
ANSWER: c
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Clonal selection implies that _____
A) brothers and sisters have similar immune responses B) antigens increase mitosis in specific lymphocytes C) only certain cells can produce interferon D) a B cell has multiple types of antigen receptors E) the body selects which antigens it will respond to
Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts. B) Plant cells are always much larger than animal cells. C) Chromosomes are found only in plant cells. D) Only plant cells have a cell membrane. E) The plant cell has no cell wall.
What is the main role of membrane proteins?
A) Hold the phospholipid bilayer together B) Block materials from entering the cell C) Regulate the passage of materials in and out of the cell D) There are no membrane proteins in the plasma membrane
What would be TRUE if linkage of two genes was complete?
A) The genes would assort independently. B) All possible combinations of alleles in the gametes would be produced. C) All possible combinations of alleles in the offspring would be produced. D) Crossing over between the two genes would rarely occur.