What is the cellular structure of most rhizarians?
A. Single celled, shelled
B. Multicellular, shelled
C. Unicellular, naked
D. Colonial, naked
E. Colonial, shelled
Answer: A
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When taxonomists recognize subspecies, they are identifying:
A. populations that are reproductively isolated from one another. B. populations with restricted enough gene flow to develop some population-specific traits, but that can still interbreed. C. populations that will, within a few generations, become separate species as reproductive isolation is nearly complete. D. populations with extremely restricted gene flow due to allopatric isolation. E. none of these
One of the reasons why the model systems of yeast, Arabidopsis, nematode worms, fruit flies, and mice are so often used to study functional analysis of genes is because
A. they all have only a few chromosomes. B. they are easy to cross with each other and observe polyploidy effects. C. they have short life cycles. D. they are easy to observe in the wild. E. they mutate easily leading to new genomic variations.
Newborn screening reveals that newborn Jessica has inherited phenylketonuria (PKU). Her parents are distraught at the diagnosis, but a nutritionist explains that Jessica can be treated, right away. The treatment for PKU is
A) nonheritable gene therapy. B) heritable gene therapy. C) exchange of her blood supply. D) dietary.
Overdrawing of river water for human uses results in _____.
A. lowered water table B. reduced nutrients in river deltas C. dried-up wells D. saltwater contamination E. runoff