What kind of bond exists between two amino acids?
a. hydrogen
b. glycosidic
c. peptide
d. ionic
e. sulfhydroxyl
C
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Hershey and Chase relied on ________ to physically separate the infected bacterial cells from the phage ghosts.
A) radioactivity B) gel filtration C) ion exchange D) centrifugation
The rapid depolarization phase of the action potentials of myocardial contractile cells is due to which ions?
A. Ca2+ only B. K+ only C. Na+ only D. Both Ca2+ and K+ E. Both Na+ and K+
Which embryonic tissue is incorrectly
associated with its derivative? a. skin; mesoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; ectoderm
Thirty people are selected for a long-term mission to colonize a planet many light-years away from Earth. The mission is successful, and the population rapidly grows to several hundred individuals. However, certain genetic diseases are unusually common
in this group, and the group's gene pool is quite different from that of the Earth population they have left behind. Which of the following phenomena has left its mark on this population? A) founder effect B) bottleneck effect C) high rates of mutation D) natural selection