The sliding filament model of muscle contraction depends on the dynamic interactions between myostatin and
myoglobin proteins.
Indicate whether the statement is true or false.
ANSWER: False - actin and myosin
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In sewage treatment, the removal of large objects and particulate matter is achieved during
A. primary treatment. B. secondary treatment. C. tertiary treatment. D. quaternary treatment.
Consider the Calvin-Benson cycle and the noncyclic photosynthetic pathway. Why is the cyclic
pathway so important? What will be an ideal response?
When phospholipid molecules are placed in water
A. the hydrophobic ends of the molecules exclude water from their surroundings. B. hydrophilic fatty acid ends mix well with the water. C. a single-layered membrane is formed. D. All of the choices occur.
The human gene for a protein hormone has been isolated. Scientists want to introduce this gene into a bacterial host, modifying the bacteria so that it can be used to produce this hormone. After successfully introducing the gene on a plasmid, the bacteria produced the protein hormone, but the protein was defective, longer than normal, with intervening stretches of amino acids not found in the native protein. What is the most likely explanation?
A. The bacteria can't transcribe the human gene. B. Bacterial ribosomes make errors when transcribing human mRNAs. C. The gene that was introduced contained introns. D. Bacterial cells cannot translate mRNAs transcribed from human genes.