The alveolates with two different nuclei are ciliates.
Answer the following statement true (T) or false (F)
True
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Which of the following muscles contract during forceful exhalation?
a. the diaphragm b. external intercostals c. internal intercostals d. the diaphragm and external intercostals e. the diaphragm and internal intercostals
The electron micrograph above shows chromatin organized like "beads on a string." At this level of
DNA compaction the "beads" are ____ and the "string" is ____.
a. nucleosomes; DNA b. 30-nm chromatin fibers; 10-nm chromatin fiber c. DNA; 10-nm chromatin fiber d. nucleosomes; histone H1 e. DNA; histone H1
Which of the following statements about blood pressure is false?
a. Systolic pressure occurs when ventricles force blood into arteries b. The greater the blood volume, the higher the blood pressure is. c. The body has blood pressure receptors in the jugular vein and in the superior vena cava. d. Diastolic pressure occurs when ventricles are relaxed.
Net primary productivity is the
a. rate of photosynthesis. b. rate of energy flow. c. amount of energy stored in the ecosystem. d. amount of energy utilized. e. amount of energy stored in the plant tissue in excess of that used by autotrophs in respiration.