The heads of myosin molecules contact the actin filaments when a muscle is relaxed

Indicate whether the statement is true or false


FALSE

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Viruses in the extracellular state possess few, if any, active enzymes.

Answer the following statement true (T) or false (F)

Biology & Microbiology