DNA transposable elements (DNA TEs) are:
A. a class of transposable elements that
replicate and transpose via DNA replication
and repair.
B. a class of transposable elements that uses
RNA as an intermediate.
C. a class of transposable elements that uses
DNA as an intermediate.
D. a class of transposable elements that uses
protein as an intermediate.
E. a class of transposable elements that uses
ribosomes as an intermediate.
A
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A microbial mat
A. is a form of biofilm. B. is poorly organized. C. contains only obligate anaerobes. D. is constructed to prevent interactions between the various layers of microorganisms. E. is a form of biofilm AND is poorly organized.
Damage to the substantia nigra, a specific region of the basal ganglia, can produce the resting muscle tremors characteristic of what disease?
A. epilepsy B. Parkinson disease C. seizures D. Alzheimer disease E. insomnia
Of the 13 essential vitamins, ____ are water soluble and ____ are fat soluble
a. 3; 10 b. 4; 9 c. 5; 8 d. 9; 4 e. 10; 3
Scientists have used the fossil record to estimate the average length of time that a species inhabits the Earth. How can this estimate be useful for assessing the impact of humans on the Earth's biological diversity?
A) It can help determine how long the human species might survive. B) It can determine which species might become extinct soon, even if humans aren't involved. C) It can estimate how many species extinctions are caused by human activity. D) It can assure us that human activity is not the cause of most species extinctions.