What is the purpose of synthesizing a negative strand RNA in positive stranded ssRNA viruses?
A) enable rolling circle amplification of the genome, which requires both strands of RNA
B) enable transcription of genes occurring on both the negative and positive strands of the genome, such as overlapping genes
C) proofreading of the genome to minimize mutations generated by the polymerase being passed onto virion progeny
D) to serve as the complementary template sequence in genome amplification of the positive strand
Answer: D
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Avogadro's number represents the ____
a. number of grams in a mole of substance b. number of moles in a gram of substance c. number of atoms in one gram of substance d. atomic weight of an atom divided by the weight of an atom of that element e. weight of an atom of an element divided by the atomic weight of that element
Speciation occurs
a. after populations become reproductively isolated and diverge. b. when mutations generate observable differences. c. when transitional forms develop between different populations. d. when natural selection pressures reach their maximum. e. with all of these.
A substrate binds to an enzyme at the _______, where the reaction occurs.
Fill in the blank(s) with the appropriate word(s).
Tests that take place in the lab, such as in a test tube or Petri-dish, outside of a living host, are referred to as _______________ whereas tests that take place in a living host, such as in a patient, are described as ______________
A.) In loco; In vitro B.) In vitro; In loco C.) In vitro; In vivo D.) In loco; In vivo