Tetracycline antibiotics interfere with
A. cell wall biosynthesis.
B. RNA synthesis.
C. DNA replication.
D. protein synthesis.
E. Mismatch repair.
Answer: D. protein synthesis.
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Why do we have fossils for only about 250,000 different species, although there must have been millions more species?
1.Fossils can form only if exposed to air, and most fossils are buried.
2.Fossils formed only where there were major disruptive geologic events, so they are relatively rare.
3.Fossils are found close to the surface so many have been destroyed by development.
4.Many ancient and extinct species were very soft, so did not fossilize well.
Which of the following is NOT a major feature of
arthropods? a. jointed appendages b. exoskeleton c. paired segmental nephridia d. specialized and fused-together segments e. specialized sensory structures
The tough, fibrous sac that surrounds, protects and lubricates the heart is the
a. myocardium. b. epicardium. c. endocardium. d. pericardium. e. trabeculae carnae.
Reef-building corals have a symbiotic relationship with algal cells called ________ that live within the cells of corals
Fill in the blank(s) with correct word