On a warm day in April, Tina jumped into the swimming pool. To her surprise the water was really cold. Which property of water did she discover?
A. The temperature of liquid water rises and falls slowly.
B. Frozen water is less dense than liquid water.
C. Water molecules are cohesive.
D. Water is a polar molecule.
E. Water possesses hydrogen bonds.
Answer: A
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A. bacteria B. yeast C. insect cells D. mammalian cell culture E. transgenic animals
The group of animals with an efficient respiratory system, in that there is no "stale air" after exhalation, is the:
a. amphibians b. birds c. mammals d. reptiles e. fish
The genome of eukaryotes consists of genes derived from
a. archaebacteria. b. eubacteria. c. both archaebacteria and eubacteria. d. neither archaebacteria or eubacteria.
Normal cells stop their division when it gets too crowded, which is celled ______ inhibition.
a. density-independent b. density-dependent c. contact inhibition d. none of the above