Answer the following statements true (T) or false (F)
1.Each myofibril consists of two types of filaments, a thick actin filament and a thin myosin filament.
2.The relative thickness of vessel walls, from greatest to least, is: artery, vein, capillary.
3.The theoretical maximum heart rate for a 20-year-old is 200.
4.Cardiac output depends on heart rate and stroke volume.
5.The right ventricle sends blood to the lungs.
1.FALSE
2.TRUE
3.TRUE
4.TRUE
5.TRUE
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Which of the following did not occur during Precambrian time?
A. ancestors of all modern animals appeared B. O2 accumulated in Earth's atmosphere C. eukaryotes arose D. photosynthesis evolved E. life originated
How many different kinds of naturally occurring amino acids are specified by the genetic code?
A. 3 B. 6 C. 12 D. 20 E. 28
Signs and symptoms of significant cyanide exposure include:
A) tachypnea. B) bradycardia. C) hypertension. D) hot, dry skin.
How are L-forms different than Mycoplasma bacteria?
A) L-forms have never had a cell wall. B) L-forms live inside plant cells. C) L-forms are susceptible to antibiotics that target the cell wall. D) L-forms are resistant to certain environmental stresses like boiling and autoclaving. E) L-forms live inside animal cells.