Organisms must constantly bring in certain molecules and ions while keeping others out. This function
is accomplished by ____.
a. the nucleus
b. lysosomes
c. vesicles
d. the plasma membrane
e. the Golgi complex
D
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Which structure prevents blood flowing back into the heart from the aorta between heartbeats?
A. semilunar valve B. atrioventricular valve C. tricuspid valve D. mitral valve E. ductus arteriosus
A difference between a stem cell and a progenitor cell is that
A) a progenitor cell cannot self-renew and a stem cell can. B) a stem cell cannot self-renew and a progenitor cell can. C) progenitor cells are rare but stem cells are abundant. D) progenitor cells are not present in embryos but stem cells are.
Filter feeders are common in kelp forests
Indicate whether the statement is true or false
Which of these common "vegetables" should technically be called a "fruit"?
A. Potato B. Carrot C. Lettuce D. String beans E. Celery