The flow of which of the following ions makes the largest contribution to the resting potential?
a. K+
b. Na+
c. H+
d. Ca2+
Ans: a. K+
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A cell that cannot form spindle fibers cannot ____
a. engage in energy production b. exchange gases across the plasma membrane c. perform mitosis nor meiosis d. perform DNA replication e. engage in protein synthesis
When cloning DNA into bacteria, the ____
a. DNA sequence is inserted into a plasmid b. DNA sequence is inserted into the bacterial chromosome c. linear DNA sequence is circularized, thus generating a plasmid d. new DNA is directly introduced into the bacterial cell e. approach depends on the species of host bacteria used in the experiment
Which of the following statements about ecological
succession is false? a. A disturbed area within a community may recover quickly if improved soil remains. b. Pioneer species are the start of community structure. c. The wastes and remains of early colonizers favor the survival of new species. d. Secondary succession occurs on a new volcanic island. e. Later successional species outcompete earlier species.
The progression through the cell cycle is highly regulated to ensure that the ______ is intact and the conditions are appropriate for a cell to divide.
Fill in the blank(s) with the appropriate word(s).