Alexander Oparin and John Haldane postulated that the early atmosphere was a reducing atmosphere. Why was this prediction an important one?
a. because the molecules contain the maximum possible number of protons that can be easily donated in reactions that lead to synthesis of complex molecules
b. because the molecules contain the minimum possible number of electrons that can be easily donated in reactions that lead to synthesis of complex molecules
c. because the molecules contain the maximum possible number of protons that can be easily accepted in reactions that lead to synthesis of complex molecules
d. because the molecules contain the maximum possible number of electrons that can be easily donated in reactions that lead to synthesis of complex molecule
Ans: d. because the molecules contain the maximum possible number of electrons that can be easily donated in reactions that lead to synthesis of complex molecule
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Motor proteins provide for molecular motion in cells by interacting with what types of cellular structures?
A) mitochondria and chloroplasts B) membrane proteins of the inner nuclear envelope C) free ribosomes and ribosomes attached to the ER D) components of the cytoskeleton E) cellulose fibers in the cell wall
The scientific work that established DNA, rather than protein, as the molecule of heredity is credited to
A) Monod and Jacob. B) Watson and Crick. C) Avery, MacLeod, and McCarty. D) Beadle and Tatum. E) Correns, von Tschermak, and de Vries.
Which of the following is a common soil anion?
A) NH4+ B) Ca2+ C) NO3- D) Mg2+
The two basic classes of cells are:
A) human and bacteria B) bacteria and eukaryotes C) unicellular and multicellular D) prokaryotes and eukaryotes E) plant and animal