The net weight of all of the organisms living in an ecosystem is its
A. combined output of metabolism and photosynthesis.
B. photosynthesis minus metabolism.
C. productivity.
D. biomass.
E. vital force.
Answer: D
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Which of the following polymerases functions in translesion synthesis and is considered error-prone because it lacks the 3'-5' exonuclease activity used for proofreading?
A. DNA Pol I B. DNA Pol II C. DNA Pol III D. DNA Pol IV E. None of these choices is correct.
Gen-Probe Mycobacterium tuberculosis direct test uses which type of nucleic acid amplification test?
a. Nucleic acid sequence-based amplification (NASBA) b. Transcription-mediated amplification (TMA) c. Reverse transcriptase polymerase chain reaction (RT-PCR) d. Standard displacement amplification (SDA)
The structure enabling depolarization to travel deep into the muscle fiber is the ______.
A. sarcomere B. motor unit C. T tubule D. sarcoplasmic reticulum
Most broad-spectrum antibiotics act by
A) inhibiting the synthesis of the cell wall. B) inhibiting protein synthesis. C) inhibiting nucleic acid synthesis. D) inhibiting metabolic pathways. E) disrupting the cytoplasmic membrane.