After Noller and colleagues performed the fragment reaction, which of the following treatments did
not allow transfer of the met* to puromycin?
a. no treatment
b. removing proteins
c. digesting proteins
d. removing rRNA
e. all of these allowed the transfer
D
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The antiparallel arrangement within DNA molecules refers to
A. a purine always bonding to a pyrimidine. B. each base bonding at the 1' position of the sugar. C. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction. D. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
Place the three primary cell layers of an embryo in order from superficial to deep
a. ectoderm ? endoderm ? mesoderm b. ectoderm ? mesoderm ? endoderm c. endoderm ? ectoderm ? mesoderm d. endoderm ? mesoderm ? ectoderm e. mesoderm ? ectoderm ? endoderm
Which of the following is NOT true about sponges?
a. They have few predators or pathogens. b. Some groups have sharp spicules of silica or calcium carbonate. c. Some species secrete a slimy body coating. d. They can harvest sea anemone nematocysts and use them for their own defense. e. Disease and overharvesting have caused population declines.
The membrane-bound enzyme system that restores and maintains the resting membrane potential is
which of the following pumps? a. sodium-phosphorus b. sodium-potassium c. sodium-chlorine d. phosphorus-calcium e. phosphorus-chlorine