The most important evidence that Darwin used to
develop his theory of natural selection came from
a. the Argentine pampas.
b. his boyhood neighborhood in England.
c. the Galápagos Islands.
d. Australia and New Zealand.
e. South America.
Answer: c
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In order for protein synthesis to begin, which of the following statements reflects the correct sequence of events?
A. The 3' end of the mRNA binds to the small ribosomal subunit and the AUG anticodon on the tRNA base pairs with the UAC codon on the mRNA, allowing the large ribosomal subunit to attach. B. The 5' end of the mRNA binds to the small ribosomal subunit, and the large subunit joins, creating the P and A sites where reactions between codons on the mRNA and anticodons on tRNA are stabilized. C. The AUG codon on mRNA base pairs with the UAC anticodon on tRNA allowing the small and large ribosomal subunits to join the complex. D. Translation begins when the ribosome translocates from the A site to the P site on the mRNA
There is evidence that life existed about:a
3.5 billion years ago. b. 2 billion years ago. c. 1.3 billion years ago. d. 630 million years ago. e. 250 million years ago
The phylum Nematoda includes which of the following very common organisms, some of which are parasitic and most of which are often found in soil?
A) Flatworms B) Earthworms C) Segmented worms D) Roundworms E) Tapeworms
A yellow slant and butt in Kligler’s iron agar indicates
a. both glucose and lactose were fermented.
b. H2S was produced.
c. both glucose and lactose were fermented and H2S was produced
d. lactose only was fermented.
e. glucose only was fermented.