Which of the following is true of the structure
labeled "A"?
a. It is composed of tubulin subunits.
b. It is composed of actin subunits.
c. It is a microfilament.
d. It is an intermediate filament.
e. It is a major component of muscle cells
A
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A person able to hear only high-frequency sounds would probably have which of the following structural problems in the ear?
A) The tympanum is damaged because of chronic ear infections. B) The basilar membrane is stiffened along its entire length. C) The ear ossicles are abnormally thickened. D) All of these problems could result in inability to detect low-frequency sound.
Which of the following statements about the value of the nitrogen cycle to an ecosystem is NOT true?
A. Nitrification occurs as ammonium is converted to nitrate. B. Nitrogen fixation can occur in aquatic systems or in soil bacteria. C. Both ammonium and nitrate ions are highly water-soluble D. Nitrification occurs as nitrogen gas is converted to nitrate. E. Denitrification removes nitrogen from the atmosphere and converts it to a form that plants can use.
T or F: the sarcoplasm is the actual contractile unit of the muscle
What will be an ideal response?
Although developed over 100 years ago, Koch's postulates continue to be used successfully in all known human infectious diseases.
Answer the following statement true (T) or false (F)