The fact that DNA replication occurs in virtually the same way in all organisms reflects:
A. its evolution early in the history of life.
B. its multiple origins in different lineages of
organisms.
C. the laws of thermodynamics.
D. the fact that mutations are generally
harmful.
E. the universal genetic code.
A
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Characteristics of a nerve net include ____
a. a centralized brain b. the flow of information between cells in all directions c. well-developed neurons d. paired ganglia e. unidirectional responses
In the absence of calcium, binding of myosin to actin is directly blocked by ______.
A. titin B. tropomyosin C. troponin D. z lines
A cell must expend energy to produce a concentration gradient
__________________ Indicate whether the statement is true or false.
All of the following are true regarding smoking EXCEPT
a. smoking inhibits the T cells from working properly in the lungs. b. smoking is viewed by many today as being socially unacceptable. c. research shows that the nicotine patch is no more effective than a placebo. d. choosing a "quit date" can increase the chance of quitting successfully.