The first person who proposed that small organic molecules could have arisen by chemical evolution was
A. Sidney Fox.
B. Thomas Cech.
C. Aleksander Oparin.
D. Stanley Miller.
E. Graham Cairns-Smith.
Answer: C
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Provides physical protection against abrasion, pathogens and chemical attack
A. Pseudostratified columnar B. Simple columnar C. Simple cuboidal D. Simple squamous E. Stratified squamous F. Transitional
Colorado tick fever is caused by a ________ and can cause headache, muscle aches and conjunctivitis in some individuals
A) coltivirus B) rotavirus C) mumps virus D) hantavirus E) coxsackie B virus
In the life cycle of a bread mold, the stage in which diploid nuclei occur is
A. the gametangium. B. the aseptate hypha. C. the asexual spores. D. the sporangium. E. the zygosporangium.
Suppose a new species of bacterium is discovered. It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand. All other properties of the enzyme remain unchanged. How would DNA replication in these bacteria differ from normal replication?
A. DNA gyrase would no longer be required for replication. B. Both new strands could be synthesized continuously like the leading strand. C. The same polymerase molecule could synthesize both strands at the same time. D. Helicase would no longer be required for replication.