In principle, a type II restriction endonuclease with an 8-nucleotide recognition sequence should cut 1 in every 48 nucleotide positions
Indicate whether the statement is true or false.
Answer: TRUE
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Which statement accurately describes the relationship between RNAi, small interfering RNA (siRNA), and miRNA?
a. They all describe different methods of post-translational gene regulation. b. miRNAs are classified into two types: RNAi molecules and siRNAs. c. RNAi occurs in two ways: by miRNAs or by siRNAs. d. RNAi is accomplished by siRNA and miRNA, but only siRNAs are cleaved by dicer proteins. e. miRNAs are transcribed from viruses while siRNAs are transcribed from nuclear DNA; both are types of
Now extinct, several lineages of ____ appear in the fossil record from the Ordovician through the
Devonian periods. These jawless fishes had skin heavily armored with bony plates and scales, and imprints of some of their fossils indicate that their brains had three regions.
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
Animals with an exoskeleton
A. cannot grow. B. must molt. C. have difficulty moving. D. All of the above are correct.
Which best describes an abiotic limiting factor in a population?
a. animals b. plants c. water d food