The adaptive radiation of the insects was most probably triggered by:
A. evolutionary innovations.
B. allopolyploidy.
C. allopatric speciation.
D. sympatric speciation
Ans: A. evolutionary innovations.
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Horizontal gene transfer has been thoroughly documented for genes involved in
A) DNA replication and repair. B) virulence and metabolic functions. C) only very few processes. D) translation.
Which of the following statements about tRNA is FALSE?
A. tRNAs of both eukaryotes and prokaryotes share common features. B. The two-dimensional structure of tRNAs exhibits a cloverleaf pattern. C. tRNAs are produced in the nucleus. D. functional tRNAs have been spliced by splicesomes. E. tRNAs possess an anticodon complementary to the codon.
On a molecular level, all organisms
a. show no similarities. b. have the same bases in DNA and RNA, the same amino acids in proteins, but use different genetic codes. c. use different means of storing genetic information. d. have the same bases in DNA and RNA, the same amino acids in proteins, and use the same genetic code. e. have the same bases in DNA and RNA, but different amino acids in proteins.
What are the properties of DNA probes?
I. They are labeled with a radioactive tracer. II. They are short chains of nucleotides. III. They match the targeted DNA sequence.
a. I and II b. II and III c. I only d. I, II, and III e. III only