The heads of myosin molecules contact the actin filaments when a muscle is relaxed
Indicate whether the statement is true or false
FALSE
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The age of a fossil can often be determined using radiometric dating of the rocks in which the fossil is found. Because uranium-238 has a half-life of 4.5 billion years, it means that:
A. when it is 9 billion years old, a rock will have no uranium-238 remaining. B. when the earth is 9 billion years old, no uranium-238 will exist. C. a uranium-containing rock that is 4.5 billion years old would, today, have only about half as much of its uranium in the form of radioactive uranium-238 as a rock that was just recently formed. D. uranium-238 cannot be used to establish the age of fossils greater than 4.5 billion years old.
During neuronal signaling, a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell. Which of the following helps establish the concentration gradient necessary for this process to occur?
A. voltage-gated Na+ channel B. Na+/K+ channel C. Na+ symporter D. Na+/K+ pump
Which of the following two enzymes are needed to construct a cDNA library?
A. reverse transcriptase and DNA ligase B. DNA ligase and Taq polymerase C. reverse transcriptase and Taq polymerase D. Taq polymerase and RNA polymerase
Viruses in the extracellular state possess few, if any, active enzymes.
Answer the following statement true (T) or false (F)