Which of the following is(are) NOT trend(s) of
vertebrate evolution?
a. conversion of the support for locomotion
from the notochord to the vertebral column
b. expansion of the nerve cord to form the
brain and spinal cord
c. changes in the respiratory system from gills
to lungs with accompanying changes in the
circulatory system
d. the development of fewer, more efficient
chambers in the heart
e. modification of limbs that allowed for more
efficient movement
D
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The cell keeps pH, temperature, and ion concentrations within a narrow window in order to maintain ______________
Fill in the blanks with correct word
Telomeres have at least two roles in chromosome integrity. Telomeres are composed of repeat sequences homologous to the RNA in telomerase used to replicate chromosome ends. Second, they
A) allow the chromosome to shorten each generation to speed up replication. B) interact with shelterin complexes that protect chromosome ends from degradation. C) permit the hairpin turn at the end to be cleaved. D) carry genes needed for DNA replication.
The abundant remains of ammonites in Oklahoma indicate that Oklahoma was
A. always a semi-arid grassland. B. once a vast desert with almost no rainfall. C. once a part of a mountain range that has now eroded. D. once covered by a shallow ocean. E. part of a vast tropical forest.
Endotoxins belong to a call of biological molecules called:
A. mucopolysaccharides B. lipopolysaccharides C. nucleic acids D. proteins E. peptidoglycans