An echinoderm characteristic is the exoskeleton,
____________________ Indicate whether the statement is true or false.
F, endoskeleton
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How is the myosin associated with vesicle transport different from the myosin found in muscle cells?
A. The tail is shorter. B. There is only one myosin head. C. It doesn't change conformation. D. It doesn't need ATP.
Among the eukaryotic microbes in the phytoplankton, the ________ are most noted for their contribution to carbon fixation.
A. green algae B. cyanobacteria C. diatoms D. dinoflagellates
What percentage of the species that have ever lived have become extinct?
a. 1 percent b. 9 percent c. 50 percent d. 75 percent e. 99 percent
The release of which hormone from the posterior pituitary causes the initial contractions of the smooth muscle in the uterus?
a. estrogen b. prostaglandins c. oxytocin d. prolactin