Which of the following DNA sequences is not commonly carried on a DNA-only transposon?
(a) transposase gene
(b) reverse transcriptase gene
(c) recognition site for transposase
(d) antibiotic-resistance gene
(b) The reverse transcriptase gene is found on retrotransposons that move via an RNA intermediate. Choices (a), (c), and (d) are all sequences that can be found in mobile genetic elements.
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Ecologists have documented the extinction over the last 20 years of ________ of the 110 species of harlequin frogs (Atelopus) native to tropical America.
A. 67% B. 100% C. 15% D. None of the choices are correct.
The ____ connects the peripheral nerves to the
brain.
a. pons b. gray matter c. white matter d. spinal cord e. medulla oblongata
The structure indicated by the letter "B" above
represents a. actin. b. myofibril. c. myosin. d. sarcoplasmic reticulum. e. muscle fiber
Hershey and Chase's experiment with radioactively labeled viruses made use of the fact that protein,
but not DNA, contains A. phosphorus. B. iron. C. sulfur. D. nitrogen. E. potassium.