A ____ lays water-proof eggs and nourishes its young with milk from glands
a. turtle
b. shark
c. platypus
d. rat
e. Gila monster
ANSWER: c
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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
When NADPH _____ electrons in the Calvin cycle, it is ______, forming NADP+.
A. donates, hydrolyzed B. donates, reduced C. donates, oxidized D. accepts, oxidized E. accepts, reduced
The stomata:
a. only open at night b. are open when guard cells are swollen with water c. close when the osmotic pressure of guard cells increases d. are covered by the cuticle to reduce water loss e. open and close in response to sunlight only
We do not have any fossils of unicellular prokaryotes. The first organisms to appear in the fossil record are unicellular eukaryotes.
Answer the following statement true (T) or false (F)