Stromatolites are ________
a. mineral features in caves that extend downward from the ceiling
b. the earliest type of seed plant
c. mat-like remains of bacteria found in extinct hydrothermal vents
d. dome-shaped, layered structures formed by photosynthetic bacteria
d
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You have 1 L of 2 mM uric acid. Conditions change in such a way that all the uric acid precipitates out of solution. What is the final osmolarity of your solution?
A. 2 mM B. 1 mM C. 1/2 mM D. 0 mM
Which of the following is true about binary fission?
a. It is thought to have evolved from mitosis. b. It is used in gamete formation. c. It results in the production of two identical daughter cells. d. It requires spindle formation. e. It is used during eukaryotic cell growth.
All EXCEPT which one of the following are
the reasons for the rapid population explosion of humans? a. increases in carrying capacity b. expansion into new habitats c. removal of limiting factors d. reproduction occurring earlier in the life cycle e. none of these
Genes are precisely copied during the process of DNA replication and never undergo any change
a. True b. False