★ Circulatory & Respiratory System Quiz
Carry oxygen in the blood and are small disk-shaped cells that have no nucleus and are made mostly of hemoglobin.
A. plasma
B. red blood cells
C. white blood cells
D. platelets
Select your answer:
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Biology › ViewWhich feature of water explains why water has high surface tension?
A. Water resists temperature changes.
B. What is a polar molecule.
C. Water expands when it freezes.
D. Water has a high density.
Molecular Genetics › View
A small circular piece of DNA found in bacteria are called …
A. recombinants
B. vectors
C. plasmids
D. prokaryotes