Export of RNAs from the nucleus occurs primarily by
a. passive diffusion through nuclear pore complexes.
b. cotranscriptional insertion through nuclear envelope membrane protein pores.
c. selective transport through nuclear pore complexes in association with proteins.
d. release from the nucleus when it breaks down at mitosis.
Ans: c. selective transport through nuclear pore complexes in association with proteins.
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What occurs during the annealing stage of a PCR reaction?
A. The DNA strands separate B. The DNA polymerase copies the template DNA C. The primers bind to complementary sequences of the template DNA D. The reaction stops
Copper has an atomic number of 29 and a mass number of 64. What would result if an uncharged copper atom lost 2 electrons?
a. The atom would have a double negative charge and be an ion. b. The atomic number would be reduced to 27 , the mass number would remain 65 and the atom would be an anion with a +2 charge. c. The atomic number would remain 29, the mass number woul be reduced to 62 and the atom would be an anion. d. The atomic number would remain 29, the mass number would remain 64 and the atom would be a cation with a +2 charge.
Sand dollars, sea stars, sea cucumbers, and sea urchins all belong to the phylum
A. Chordata. B. Rotifera. C. Arthropoda. D. Lophophorates. E. Echinodermata.
In most prokaryotes, DNA replication proceeds
a. without an RNA primer. b. 3? to 5?. c. using only a single strand as a template. d. bidirectionally.