The I bands in skeletal muscle are composed of ____
a. discs to which thin filaments are anchored
b. stacked thick filaments along with the parts of thin filaments that overlap both ends
c. thin filaments but no thick filaments
d. thick filaments but no thin filaments
e. stacked thin filaments along with parts of thick filaments that overlap both ends
ANSWER: c
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Recall that over the last 400,000 years, atmospheric CO2 levels have fluctuated, with the lowest levels occurring during glacial periods and the highest levels seen during interglacial periods
Why might atmospheric CO2 levels be lower during glacial periods? A. During glacial periods there are more volcanic eruptions. B. During glacial periods there are fewer photosynthesizing plants. C. During glacial periods more carbon is stored in ocean reservoirs. D. During glacial periods chemical weathering stops.
The chemolithotrophs that metabolize reduced sulfur compounds using oxygen as a terminal electron acceptor in the Winogradsky column include ________.
A. cyanobacteria B. Chromatium C. Desulfovibrio D. Beggiatoa
Your infant has been diagnosed with severe combined immunodeficiency disease (SCID). Your doctor suggests which treatment as a possible cure for the disease?
A. Gene therapy B. Genome mapping C. Microarrays D. Reverse transcription
What is an ecological niche?
What will be an ideal response?